draw-gdk.c

Go to the documentation of this file.

/*
 * gEDA - GNU Electronic Design Automation
 * This file is a part of gerbv.
 *
 *   Copyright (C) 2000-2003 Stefan Petersen (spe@stacken.kth.se)
 *
 * $Id$
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
 */
 
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
 
#include <stdio.h>
#include <stdlib.h>
#include <math.h> /* ceil(), atan2() */
 
#ifdef HAVE_STRING_H
#include <string.h>
#endif
 
#include <gtk/gtk.h>
#include "gerbv.h"
#include "draw-gdk.h"
#include "common.h"
 
#undef round
#define round(x) ceil((double)(x))
 
#define dprintf \
    if (DEBUG)  \
    printf
 
/*
 * If you want to rotate a
 * column vector v by t degrees using matrix M, use
 *
 *   M = {{cos t, -sin t}, {sin t, cos t}} in M*v.
 *
 * From comp.graphics.algorithms Frequently Asked Questions
 *
 * Due reverse defintion of X-axis in GTK you have to negate
 * angels.
 *
 */
static GdkPoint
rotate_point(GdkPoint point, double angle) {
    double   sint, cost;
    GdkPoint returned;
 
    if (angle == 0.0)
        return point;
 
    sint = sin(DEG2RAD(-angle));
    cost = cos(DEG2RAD(-angle));
 
    returned.x = lround(cost * point.x - sint * point.y);
    returned.y = lround(sint * point.x + cost * point.y);
 
    return returned;
}
 
/*
 * Aperture macro primitive 1 (Circle)
 */
static void
gerbv_gdk_draw_prim1(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    const int  exposure_idx = 0;
    const int  diameter_idx = 1;
    const int  x_offset_idx = 2;
    const int  y_offset_idx = 3;
    const gint full_circle  = 23360;
    GdkGC*     local_gc     = gdk_gc_new(pixmap);
    gint       dia          = round(fabs(s->parameter[diameter_idx] * scale));
    gint       real_x       = x - dia / 2;
    gint       real_y       = y - dia / 2;
    GdkColor   color;
 
    gdk_gc_copy(local_gc, gc);
 
    real_x += (int)(s->parameter[x_offset_idx] * (double)scale);
    real_y -= (int)(s->parameter[y_offset_idx] * (double)scale);
 
    /* Exposure */
    if (s->parameter[exposure_idx] == 0.0) {
        color.pixel = 0;
        gdk_gc_set_foreground(local_gc, &color);
    }
 
    gdk_gc_set_line_attributes(
        local_gc, 1, /* outline always 1 pixels */
        GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER
    );
 
    /*
     * A filled circle
     */
    gdk_draw_arc(pixmap, local_gc, 1, real_x, real_y, dia, dia, 0, full_circle);
 
    gdk_gc_unref(local_gc);
 
    return;
} /* gerbv_gdk_draw_prim1 */
 
/*
 * Aperture macro primitive 4 (outline)
 * - Start point is not included in number of points.
 * - Outline is 1 pixel.
 */
static void
gerbv_gdk_draw_prim4(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    const int exposure_idx   = 0;
    const int nuf_points_idx = 1;
    const int first_x_idx    = 2;
    const int first_y_idx    = 3;
    const int rotext_idx     = 4;
    GdkGC*    local_gc       = gdk_gc_new(pixmap);
    int       nuf_points, point;
    double    rotation;
    GdkPoint* points;
    GdkColor  color;
 
    /* Include start point */
    nuf_points = (int)s->parameter[nuf_points_idx] + 1;
    points     = g_new(GdkPoint, nuf_points);
    if (!points) {
        g_free(points);
        return;
    }
 
    rotation = s->parameter[(nuf_points - 1) * 2 + rotext_idx];
    for (point = 0; point < nuf_points; point++) {
        points[point].x = (int)round(scale * s->parameter[point * 2 + first_x_idx]);
        points[point].y = -(int)round(scale * s->parameter[point * 2 + first_y_idx]);
        if (rotation != 0.0)
            points[point] = rotate_point(points[point], rotation);
        points[point].x += x;
        points[point].y += y;
    }
 
    gdk_gc_copy(local_gc, gc);
 
    /* Exposure */
    if (s->parameter[exposure_idx] == 0.0) {
        color.pixel = 0;
        gdk_gc_set_foreground(local_gc, &color);
    }
 
    gdk_gc_set_line_attributes(
        local_gc, 1, /* outline always 1 pixels */
        GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER
    );
    gdk_draw_polygon(pixmap, local_gc, 1, points, nuf_points);
 
    g_free(points);
 
    gdk_gc_unref(local_gc);
 
    return;
} /* gerbv_gdk_draw_prim4 */
 
/*
 * Aperture macro primitive 5 (polygon)
 */
static void
gerbv_gdk_draw_prim5(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    const int exposure_idx     = 0;
    const int nuf_vertices_idx = 1;
    const int center_x_idx     = 2;
    const int center_y_idx     = 3;
    const int diameter_idx     = 4;
    const int rotation_idx     = 5;
    int       nuf_vertices, i;
    double    vertex, tick, rotation, radius;
    GdkPoint* points;
    GdkGC*    local_gc = gdk_gc_new(pixmap);
    GdkColor  color;
 
    nuf_vertices = (int)s->parameter[nuf_vertices_idx];
    points       = g_new(GdkPoint, nuf_vertices);
    if (!points) {
        g_free(points);
        return;
    }
 
    gdk_gc_copy(local_gc, gc);
 
    /* Exposure */
    if (s->parameter[exposure_idx] == 0.0) {
        color.pixel = 0;
        gdk_gc_set_foreground(local_gc, &color);
    }
 
    tick     = 2 * M_PI / (double)nuf_vertices;
    rotation = DEG2RAD(-s->parameter[rotation_idx]);
    radius   = s->parameter[diameter_idx] / 2.0;
    for (i = 0; i < nuf_vertices; i++) {
        vertex      = tick * (double)i + rotation;
        points[i].x = (int)round(scale * (radius * cos(vertex) + s->parameter[center_x_idx])) + x;
        points[i].y = (int)round(scale * (radius * sin(vertex) - s->parameter[center_y_idx])) + y;
    }
 
    gdk_draw_polygon(pixmap, local_gc, 1, points, nuf_vertices);
 
    gdk_gc_unref(local_gc);
 
    g_free(points);
    return;
} /* gerbv_gdk_draw_prim5 */
 
/*
 * Doesn't handle and explicit x,y yet
 * Questions:
 *  - is "gap" distance between edges of circles or distance between
 *    center of line of circle?
 */
static void
gerbv_gdk_draw_prim6(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    const int outside_dia_idx  = 2;
    const int ci_thickness_idx = 3;
    const int gap_idx          = 4;
    const int nuf_circles_idx  = 5;
    const int ch_thickness_idx = 6;
    const int ch_length_idx    = 7;
    const int rotation_idx     = 8;
    GdkGC*    local_gc         = gdk_gc_new(pixmap);
    double    real_dia;
    double    real_dia_diff;
    int       circle;
    GdkPoint  crosshair[4];
    int       point;
 
    gdk_gc_copy(local_gc, gc);
    gdk_gc_set_line_attributes(
        local_gc, (int)round(scale * s->parameter[ci_thickness_idx]), GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER
    );
 
    real_dia      = s->parameter[outside_dia_idx] - s->parameter[ci_thickness_idx] / 2.0;
    real_dia_diff = 2 * (s->parameter[gap_idx] + s->parameter[ci_thickness_idx]);
 
    for (circle = 0; circle != (int)s->parameter[nuf_circles_idx]; circle++) {
        /*
         * Non filled circle
         */
        const gint full_circle = 23360;
        gint       dia         = (real_dia - real_dia_diff * circle) * scale;
        if (dia >= 0) {
            gdk_draw_arc(pixmap, local_gc, 0, x - dia / 2, y - dia / 2, dia, dia, 0, full_circle);
        }
    }
 
    /*
     * Cross Hair
     */
    memset(crosshair, 0, sizeof(GdkPoint) * 4);
    crosshair[0].x = (int)((s->parameter[ch_length_idx] / 2.0) * scale);
    /*crosshair[0].y = 0;*/
    crosshair[1].x = -crosshair[0].x;
    /*crosshair[1].y = 0;*/
    /*crosshair[2].x = 0;*/
    crosshair[2].y = crosshair[0].x;
    /*crosshair[3].x = 0;*/
    crosshair[3].y = -crosshair[0].x;
 
    gdk_gc_set_line_attributes(
        local_gc, (int)round(scale * s->parameter[ch_thickness_idx]), GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER
    );
 
    for (point = 0; point < 4; point++) {
        crosshair[point] = rotate_point(crosshair[point], s->parameter[rotation_idx]);
        crosshair[point].x += x;
        crosshair[point].y += y;
    }
    gdk_draw_line(pixmap, local_gc, crosshair[0].x, crosshair[0].y, crosshair[1].x, crosshair[1].y);
    gdk_draw_line(pixmap, local_gc, crosshair[2].x, crosshair[2].y, crosshair[3].x, crosshair[3].y);
 
    gdk_gc_unref(local_gc);
 
    return;
} /* gerbv_gdk_draw_prim6 */
 
static void
gerbv_gdk_draw_prim7(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    const int   outside_dia_idx  = 2;
    const int   inside_dia_idx   = 3;
    const int   ch_thickness_idx = 4;
    const int   rotation_idx     = 5;
    const gint  full_circle      = 23360;
    GdkGCValues gc_val;
    int         diameter, i;
    GdkGC*      local_gc = gdk_gc_new(pixmap);
    GdkPoint    point[4];
    double      ci_thickness = (s->parameter[outside_dia_idx] - s->parameter[inside_dia_idx]) / 2.0;
 
    gdk_gc_copy(local_gc, gc);
    gdk_gc_set_line_attributes(
        local_gc, (int)round(scale * ci_thickness), GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER
    );
 
    /*
     * Non filled circle
     */
    diameter = (s->parameter[inside_dia_idx] + ci_thickness) * scale;
    gdk_draw_arc(pixmap, local_gc, 0, x - diameter / 2, y - diameter / 2, diameter, diameter, 0, full_circle);
 
    /*
     * Cross hair
     */
    /* Calculate the end points of the crosshair */
    /* GDK doesn't always remove all of the circle (round of error probably)
       I extend the crosshair line with 2 (one pixel in each end) to make
       sure all of the circle is removed with the crosshair */
    for (i = 0; i < 4; i++) {
        point[i].x = round((s->parameter[outside_dia_idx] / 2.0) * scale) + 2;
        point[i].y = 0;
        point[i]   = rotate_point(point[i], s->parameter[rotation_idx] + 90 * i);
        point[i].x += x;
        point[i].y += y;
    }
 
    gdk_gc_set_line_attributes(
        local_gc, (int)round(scale * s->parameter[ch_thickness_idx]), GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER
    );
 
    /* The cross hair should "cut out" parts of the circle, hence inverse */
    gdk_gc_get_values(local_gc, &gc_val);
    if (gc_val.foreground.pixel == 1)
        gc_val.foreground.pixel = 0;
    else
        gc_val.foreground.pixel = 1;
    gdk_gc_set_foreground(local_gc, &(gc_val.foreground));
 
    /* Draw the actual cross */
    gdk_draw_line(pixmap, local_gc, point[0].x, point[0].y, point[2].x, point[2].y);
    gdk_draw_line(pixmap, local_gc, point[1].x, point[1].y, point[3].x, point[3].y);
 
    gdk_gc_unref(local_gc);
 
    return;
} /* gerbv_gdk_draw_prim7 */
 
/*
 * Doesn't handle and explicit x,y yet
 */
static void
gerbv_gdk_draw_prim20(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    const int exposure_idx  = 0;
    const int linewidth_idx = 1;
    const int start_x_idx   = 2;
    const int start_y_idx   = 3;
    const int end_x_idx     = 4;
    const int end_y_idx     = 5;
    const int rotation_idx  = 6;
    const int nuf_points    = 2;
    GdkGC*    local_gc      = gdk_gc_new(pixmap);
    GdkPoint  points[nuf_points];
    GdkColor  color;
    int       i;
 
    gdk_gc_copy(local_gc, gc);
 
    /* Exposure */
    if (s->parameter[exposure_idx] == 0.0) {
        color.pixel = 0;
        gdk_gc_set_foreground(local_gc, &color);
    }
 
    gdk_gc_set_line_attributes(
        local_gc, (int)round(scale * s->parameter[linewidth_idx]), GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER
    );
 
    points[0].x = (s->parameter[start_x_idx] * scale);
    points[0].y = (s->parameter[start_y_idx] * scale);
    points[1].x = (s->parameter[end_x_idx] * scale);
    points[1].y = (s->parameter[end_y_idx] * scale);
 
    for (i = 0; i < nuf_points; i++) {
        points[i]   = rotate_point(points[i], -s->parameter[rotation_idx]);
        points[i].x = x + points[i].x;
        points[i].y = y - points[i].y;
    }
 
    gdk_draw_line(pixmap, local_gc, points[0].x, points[0].y, points[1].x, points[1].y);
 
    gdk_gc_unref(local_gc);
 
    return;
} /* gerbv_gdk_draw_prim20 */
 
static void
gerbv_gdk_draw_prim21(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    const int exposure_idx = 0;
    const int width_idx    = 1;
    const int height_idx   = 2;
    const int exp_x_idx    = 3;
    const int exp_y_idx    = 4;
    const int rotation_idx = 5;
    const int nuf_points   = 4;
    GdkPoint  points[nuf_points];
    GdkColor  color;
    GdkGC*    local_gc = gdk_gc_new(pixmap);
    int       half_width, half_height;
    int       i;
 
    half_width  = (int)round(s->parameter[width_idx] * scale / 2.0);
    half_height = (int)round(s->parameter[height_idx] * scale / 2.0);
 
    points[0].x = half_width;
    points[0].y = half_height;
 
    points[1].x = half_width;
    points[1].y = -half_height;
 
    points[2].x = -half_width;
    points[2].y = -half_height;
 
    points[3].x = -half_width;
    points[3].y = half_height;
 
    for (i = 0; i < nuf_points; i++) {
        points[i].x += (int)(s->parameter[exp_x_idx] * scale);
        points[i].y -= (int)(s->parameter[exp_y_idx] * scale);
        points[i] = rotate_point(points[i], s->parameter[rotation_idx]);
        points[i].x += x;
        points[i].y += y;
    }
 
    gdk_gc_copy(local_gc, gc);
 
    /* Exposure */
    if (s->parameter[exposure_idx] == 0.0) {
        color.pixel = 0;
        gdk_gc_set_foreground(local_gc, &color);
    }
 
    gdk_draw_polygon(pixmap, local_gc, 1, points, nuf_points);
 
    gdk_gc_unref(local_gc);
 
    return;
} /* gerbv_gdk_draw_prim21 */
 
/*
 * Doesn't handle explicit x,y yet
 */
static void
gerbv_gdk_draw_prim22(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    const int exposure_idx     = 0;
    const int width_idx        = 1;
    const int height_idx       = 2;
    const int x_lower_left_idx = 3;
    const int y_lower_left_idx = 4;
    const int rotation_idx     = 5;
    const int nuf_points       = 4;
    GdkPoint  points[nuf_points];
    GdkGC*    local_gc = gdk_gc_new(pixmap);
    GdkColor  color;
    int       i;
 
    points[0].x = (int)round(s->parameter[x_lower_left_idx] * scale);
    points[0].y = (int)round(s->parameter[y_lower_left_idx] * scale);
 
    points[1].x = (int)round((s->parameter[x_lower_left_idx] + s->parameter[width_idx]) * scale);
    points[1].y = (int)round(s->parameter[y_lower_left_idx] * scale);
 
    points[2].x = (int)round((s->parameter[x_lower_left_idx] + s->parameter[width_idx]) * scale);
    points[2].y = (int)round((s->parameter[y_lower_left_idx] + s->parameter[height_idx]) * scale);
 
    points[3].x = (int)round(s->parameter[x_lower_left_idx] * scale);
    points[3].y = (int)round((s->parameter[y_lower_left_idx] + s->parameter[height_idx]) * scale);
 
    for (i = 0; i < nuf_points; i++) {
        points[i]   = rotate_point(points[i], -s->parameter[rotation_idx]);
        points[i].x = x + points[i].x;
        points[i].y = y - points[i].y;
    }
 
    gdk_gc_copy(local_gc, gc);
 
    /* Exposure */
    if (s->parameter[exposure_idx] == 0.0) {
        color.pixel = 0;
        gdk_gc_set_foreground(local_gc, &color);
    }
 
    gdk_draw_polygon(pixmap, local_gc, 1, points, nuf_points);
 
    gdk_gc_unref(local_gc);
 
    return;
} /* gerbv_gdk_draw_prim22 */
 
/* Keep this array in order and without holes */
static void (*dgk_draw_amacro_funcs[])(GdkPixmap*, GdkGC*, gerbv_simplified_amacro_t*, double, gint, gint) = {
    [GERBV_APTYPE_MACRO_CIRCLE] = &gerbv_gdk_draw_prim1,  [GERBV_APTYPE_MACRO_OUTLINE] = &gerbv_gdk_draw_prim4,
    [GERBV_APTYPE_MACRO_POLYGON] = &gerbv_gdk_draw_prim5, [GERBV_APTYPE_MACRO_MOIRE] = &gerbv_gdk_draw_prim6,
    [GERBV_APTYPE_MACRO_THERMAL] = &gerbv_gdk_draw_prim7, [GERBV_APTYPE_MACRO_LINE20] = &gerbv_gdk_draw_prim20,
    [GERBV_APTYPE_MACRO_LINE21] = &gerbv_gdk_draw_prim21, [GERBV_APTYPE_MACRO_LINE22] = &gerbv_gdk_draw_prim22,
};
 
static inline void
gerbv_gdk_draw_amacro(GdkPixmap* pixmap, GdkGC* gc, gerbv_simplified_amacro_t* s, double scale, gint x, gint y) {
    dprintf("%s(): drawing simplified aperture macros:\n", __func__);
 
    while (s != NULL) {
        if (s->type >= GERBV_APTYPE_MACRO_CIRCLE && s->type <= GERBV_APTYPE_MACRO_LINE22) {
            dgk_draw_amacro_funcs[s->type](pixmap, gc, s, scale, x, y);
            dprintf("  %s\n", gerbv_aperture_type_name(s->type));
        } else {
            GERB_FATAL_ERROR(_("Unknown simplified aperture macro type %d"), s->type);
        }
 
        s = s->next;
    }
} /* gerbv_gdk_draw_amacro */
 
/*
 * Draws a circle _centered_ at x,y with diameter dia
 */
static void
gerbv_gdk_draw_circle(GdkPixmap* pixmap, GdkGC* gc, gint filled, gint x, gint y, gint dia) {
    static const gint full_circle = 23360;
    gint              real_x      = x - dia / 2;
    gint              real_y      = y - dia / 2;
 
    gdk_draw_arc(pixmap, gc, filled, real_x, real_y, dia, dia, 0, full_circle);
 
    return;
} /* gerbv_gdk_draw_circle */
 
/*
 * Draws a rectangle _centered_ at x,y with sides x_side, y_side
 */
static void
gerbv_gdk_draw_rectangle(
    GdkPixmap* pixmap, GdkGC* gc, int filled, gint x, gint y, gint x_side, gint y_side, double angle_deg
) {
    int      i;
    GdkPoint points[4];
 
    points[0].x = -(x_side >> 1);
    points[0].y = -(y_side >> 1);
    points[1].x = x_side >> 1;
    points[1].y = points[0].y;
    points[2].x = points[1].x;
    points[2].y = y_side >> 1;
    points[3].x = points[0].x;
    points[3].y = points[2].y;
 
    for (i = 0; i < 4; i++) {
        points[i] = rotate_point(points[i], angle_deg);
        points[i].x += x;
        points[i].y += y;
    }
 
    gdk_draw_polygon(pixmap, gc, filled, points, 4);
 
    return;
} /* gerbv_gdk_draw_rectangle */
 
/*
 * Draws an oval _centered_ at x,y with x axis x_axis and y axis y_axis
 */
static void
gerbv_gdk_draw_oval(
    GdkPixmap* pixmap, GdkGC* gc, int filled, gint x, gint y, gint x_axis, gint y_axis, double angle_deg
) {
    gint     width;
    GdkPoint points[2];
    GdkGC*   local_gc = gdk_gc_new(pixmap);
 
    gdk_gc_copy(local_gc, gc);
 
    if (x_axis > y_axis) {
        /* Draw in x axis */
        width = y_axis;
 
        points[0].x = -(x_axis >> 1) + (y_axis >> 1);
        points[0].y = 0;
        points[1].x = (x_axis >> 1) - (y_axis >> 1);
        points[1].y = 0;
    } else {
        /* Draw in y axis */
        width = x_axis;
 
        points[0].x = 0;
        points[0].y = -(y_axis >> 1) + (x_axis >> 1);
        points[1].x = 0;
        points[1].y = (y_axis >> 1) - (x_axis >> 1);
    }
 
    points[0] = rotate_point(points[0], angle_deg);
    points[0].x += x;
    points[0].y += y;
    points[1] = rotate_point(points[1], angle_deg);
    points[1].x += x;
    points[1].y += y;
 
    gdk_gc_set_line_attributes(local_gc, width, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_MITER);
    gdk_draw_line(pixmap, local_gc, points[0].x, points[0].y, points[1].x, points[1].y);
 
    gdk_gc_unref(local_gc);
 
    return;
} /* gerbv_gdk_draw_oval */
 
/*
 * Draws an arc
 * Draws an arc _centered_ at x,y
 * direction:  0 counterclockwise, 1 clockwise
 */
static void
gerbv_gdk_draw_arc(
    GdkPixmap* pixmap, GdkGC* gc, int x, int y, gdouble width, gdouble height, double angle1, double angle2
) {
    gint real_x = round(x - width / 2);
    gint real_y = round(y - height / 2);
 
    gdk_draw_arc(
        pixmap, gc, FALSE, real_x, real_y, width, height, round(64 * fmod(angle1, 360)), round(64 * (angle2 - angle1))
    );
} /* gerbv_gdk_draw_arc */
 
void
draw_gdk_render_polygon_object(
    gerbv_net_t* oldNet, gerbv_image_t* image, double sr_x, double sr_y, cairo_matrix_t* fullMatrix,
    cairo_matrix_t* scaleMatrix, GdkGC* gc, GdkGC* pgc, GdkPixmap** pixmap
) {
    gerbv_net_t* currentNet;
    gint         x2, y2, cp_x = 0, cp_y = 0, cir_width = 0;
    GdkPoint*    points = NULL;
    unsigned int pointArraySize, curr_point_idx;
    int          steps, i;
    gdouble      angleDiff, tempX, tempY;
 
    /* save the first net in the polygon as the "ID" net pointer
    in case we are saving this net to the selection array */
    curr_point_idx = 0;
    pointArraySize = 0;
 
    for (currentNet = oldNet->next; currentNet != NULL; currentNet = currentNet->next) {
        tempX = currentNet->stop_x + sr_x;
        tempY = currentNet->stop_y + sr_y;
        cairo_matrix_transform_point(fullMatrix, &tempX, &tempY);
        x2 = (int)round(tempX);
        y2 = (int)round(tempY);
 
        /*
         * If circle segment, scale and translate that one too
         */
        if (currentNet->cirseg) {
            tempX = currentNet->cirseg->width;
            tempY = currentNet->cirseg->height;
            cairo_matrix_transform_point(scaleMatrix, &tempX, &tempY);
 
            /* Variables can be negative after transformation */
            tempX     = fabs(tempX);
            cir_width = (int)round(tempX);
 
            tempX = currentNet->cirseg->cp_x + sr_x;
            tempY = currentNet->cirseg->cp_y + sr_y;
            cairo_matrix_transform_point(fullMatrix, &tempX, &tempY);
            cp_x = (int)round(tempX);
            cp_y = (int)round(tempY);
        }
 
        switch (currentNet->interpolation) {
            case GERBV_INTERPOLATION_LINEARx1:
            case GERBV_INTERPOLATION_LINEARx10:
            case GERBV_INTERPOLATION_LINEARx01:
            case GERBV_INTERPOLATION_LINEARx001:
                if (pointArraySize < (curr_point_idx + 1)) {
                    pointArraySize = curr_point_idx + 1;
                    points         = (GdkPoint*)g_realloc(points, pointArraySize * sizeof(GdkPoint));
                }
                points[curr_point_idx].x = x2;
                points[curr_point_idx].y = y2;
                curr_point_idx++;
                break;
            case GERBV_INTERPOLATION_CW_CIRCULAR:
            case GERBV_INTERPOLATION_CCW_CIRCULAR:
                /* we need to chop up the arc into small lines for rendering
                with GDK */
                angleDiff = currentNet->cirseg->angle2 - currentNet->cirseg->angle1;
                steps     = (int)abs(angleDiff);
                if (pointArraySize < (curr_point_idx + steps)) {
                    pointArraySize = curr_point_idx + steps;
                    points         = (GdkPoint*)g_realloc(points, pointArraySize * sizeof(GdkPoint));
                }
                for (i = 0; i < steps; i++) {
                    points[curr_point_idx].x =
                        cp_x + cir_width / 2.0 * cos(DEG2RAD(currentNet->cirseg->angle1 + (angleDiff * i) / steps));
                    points[curr_point_idx].y =
                        cp_y - cir_width / 2.0 * sin(DEG2RAD(currentNet->cirseg->angle1 + (angleDiff * i) / steps));
                    curr_point_idx++;
                }
                break;
            case GERBV_INTERPOLATION_PAREA_END:
                gdk_gc_copy(pgc, gc);
                gdk_gc_set_line_attributes(pgc, 1, GDK_LINE_SOLID, GDK_CAP_PROJECTING, GDK_JOIN_MITER);
                gdk_draw_polygon(*pixmap, pgc, 1, points, curr_point_idx);
                g_free(points);
                points = NULL;
                return;
            default: GERB_COMPILE_WARNING(_("Skipped interpolation type %d"), currentNet->interpolation); break;
        }
    }
    return;
}
 
void
draw_gdk_apply_netstate_transformation(
    cairo_matrix_t* fullMatrix, cairo_matrix_t* scaleMatrix, gerbv_netstate_t* state
) {
    /* apply scale factor */
    cairo_matrix_scale(fullMatrix, state->scaleA, state->scaleB);
    cairo_matrix_scale(scaleMatrix, state->scaleA, state->scaleB);
    /* apply offset */
    cairo_matrix_translate(fullMatrix, state->offsetA, state->offsetB);
    /* apply mirror */
    switch (state->mirrorState) {
        case GERBV_MIRROR_STATE_FLIPA:
            cairo_matrix_scale(fullMatrix, -1, 1);
            cairo_matrix_scale(scaleMatrix, -1, 1);
            break;
        case GERBV_MIRROR_STATE_FLIPB:
            cairo_matrix_scale(fullMatrix, 1, -1);
            cairo_matrix_scale(scaleMatrix, -1, 1);
            break;
        case GERBV_MIRROR_STATE_FLIPAB:
            cairo_matrix_scale(fullMatrix, -1, -1);
            cairo_matrix_scale(scaleMatrix, -1, 1);
            break;
        default: break;
    }
    /* finally, apply axis select */
    if (state->axisSelect == GERBV_AXIS_SELECT_SWAPAB) {
        /* we do this by rotating 270 (counterclockwise, then mirroring
           the Y axis */
        cairo_matrix_rotate(fullMatrix, M_PI + M_PI_2);
        cairo_matrix_scale(fullMatrix, 1, -1);
    }
}
 
static void
draw_gdk_cross(GdkPixmap* pixmap, GdkGC* gc, gint xc, gint yc, gint r) {
    gdk_gc_set_line_attributes(gc, 1, GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER);
    gdk_draw_line(pixmap, gc, xc - r, yc, xc + r, yc);
    gdk_draw_line(pixmap, gc, xc, yc - r, xc, yc + r);
}
 
/*
 * Convert a gerber image to a GDK clip mask to be used when creating pixmap
 */
int
draw_gdk_image_to_pixmap(
    GdkPixmap** pixmap, gerbv_image_t* image, double scale, double trans_x, double trans_y, enum draw_mode drawMode,
    gerbv_selection_info_t* selectionInfo, gerbv_render_info_t* renderInfo, gerbv_user_transformation_t transform
) {
    const int         hole_cross_inc_px = 8;
    GdkGC*            gc                = gdk_gc_new(*pixmap);
    GdkGC*            pgc               = gdk_gc_new(*pixmap);
    GdkGCValues       gc_values;
    struct gerbv_net* net;
    gerbv_netstate_t* oldState;
    gerbv_layer_t*    oldLayer;
    gint              x1, y1, x2, y2;
    glong             xlong1, ylong1, xlong2, ylong2;
    int               p1, p2;
    double            cir_width = 0, cir_height = 0;
    int               cp_x = 0, cp_y = 0;
    GdkColor          transparent, opaque;
    gerbv_polarity_t  polarity;
    gdouble           tempX, tempY, r;
    gdouble           minX = 0, minY = 0, maxX = 0, maxY = 0;
 
    if (image == NULL || image->netlist == NULL) {
        gdk_gc_unref(gc);
        gdk_gc_unref(pgc);
 
        return 0;
    }
 
    if (transform.inverted) {
        if (image->info->polarity == GERBV_POLARITY_POSITIVE)
            polarity = GERBV_POLARITY_NEGATIVE;
        else
            polarity = GERBV_POLARITY_POSITIVE;
    } else {
        polarity = image->info->polarity;
    }
    if (drawMode == DRAW_SELECTIONS)
        polarity = GERBV_POLARITY_POSITIVE;
 
    gboolean useOptimizations = TRUE;
    // if the user is using any transformations for this layer, then don't bother using rendering
    //   optimizations
    if (fabs(transform.translateX) > GERBV_PRECISION_LINEAR_INCH
        || fabs(transform.translateY) > GERBV_PRECISION_LINEAR_INCH
        || fabs(transform.scaleX - 1) > GERBV_PRECISION_LINEAR_INCH
        || fabs(transform.scaleY - 1) > GERBV_PRECISION_LINEAR_INCH
        || fabs(transform.rotation) > GERBV_PRECISION_ANGLE_RAD || transform.mirrorAroundX || transform.mirrorAroundY)
        useOptimizations = FALSE;
 
    // calculate the transformation matrix for the user_transformation options
    cairo_matrix_t fullMatrix, scaleMatrix;
    cairo_matrix_init(&fullMatrix, 1, 0, 0, 1, 0, 0);
    cairo_matrix_init(&scaleMatrix, 1, 0, 0, 1, 0, 0);
 
    cairo_matrix_translate(&fullMatrix, trans_x, trans_y);
    cairo_matrix_scale(&fullMatrix, scale, scale);
    cairo_matrix_scale(&scaleMatrix, scale, scale);
    /* offset image */
 
    cairo_matrix_translate(&fullMatrix, transform.translateX, -1 * transform.translateY);
    // don't use mirroring for the scale matrix
    gdouble scaleX = transform.scaleX;
    gdouble scaleY = -1 * transform.scaleY;
    cairo_matrix_scale(&scaleMatrix, scaleX, -1 * scaleY);
    if (transform.mirrorAroundX)
        scaleY *= -1;
    if (transform.mirrorAroundY)
        scaleX *= -1;
 
    cairo_matrix_scale(&fullMatrix, scaleX, scaleY);
    /* do image rotation */
    cairo_matrix_rotate(&fullMatrix, transform.rotation);
    // cairo_matrix_rotate (&scaleMatrix, transform.rotation);
 
    /* do image rotation */
    cairo_matrix_rotate(&fullMatrix, image->info->imageRotation);
 
    if (useOptimizations) {
        minX = renderInfo->lowerLeftX;
        minY = renderInfo->lowerLeftY;
        maxX = renderInfo->lowerLeftX + (renderInfo->displayWidth / renderInfo->scaleFactorX);
        maxY = renderInfo->lowerLeftY + (renderInfo->displayHeight / renderInfo->scaleFactorY);
    }
 
    /* Set up the two "colors" we have */
    opaque.pixel      = 0; /* opaque will not let color through */
    transparent.pixel = 1; /* transparent will let color through */
 
    /*
     * Clear clipmask and set draw color depending image on image polarity
     */
    if (polarity == GERBV_POLARITY_NEGATIVE) {
        gdk_gc_set_foreground(gc, &transparent);
        gdk_draw_rectangle(*pixmap, gc, TRUE, 0, 0, -1, -1);
        gdk_gc_set_foreground(gc, &opaque);
    } else {
        gdk_gc_set_foreground(gc, &opaque);
        gdk_draw_rectangle(*pixmap, gc, TRUE, 0, 0, -1, -1);
        gdk_gc_set_foreground(gc, &transparent);
    }
    oldLayer = image->layers;
    oldState = image->states;
    for (net = image->netlist->next; net != NULL; net = gerbv_image_return_next_renderable_object(net)) {
        int    repeat_X = 1, repeat_Y = 1;
        double repeat_dist_X = 0.0, repeat_dist_Y = 0.0;
        int    repeat_i, repeat_j;
 
        /*
         * If step_and_repeat (%SR%) used, repeat the drawing;
         */
        repeat_X      = net->layer->stepAndRepeat.X;
        repeat_Y      = net->layer->stepAndRepeat.Y;
        repeat_dist_X = net->layer->stepAndRepeat.dist_X;
        repeat_dist_Y = net->layer->stepAndRepeat.dist_Y;
 
        /* check if this is a new netstate */
        if (net->state != oldState) {
            /* it's a new state, so recalculate the new transformation matrix
               for it */
            draw_gdk_apply_netstate_transformation(&fullMatrix, &scaleMatrix, net->state);
            oldState = net->state;
        }
        /* check if this is a new layer */
        /* for now, only do layer rotations in GDK rendering */
        if (net->layer != oldLayer) {
            cairo_matrix_rotate(&fullMatrix, net->layer->rotation);
            oldLayer = net->layer;
        }
 
        if (drawMode == DRAW_SELECTIONS) {
            gboolean               foundNet = FALSE;
            gerbv_selection_item_t sItem;
 
            for (guint i = 0; i < selectionInfo->selectedNodeArray->len; i++) {
                sItem = g_array_index(selectionInfo->selectedNodeArray, gerbv_selection_item_t, i);
                if (sItem.net == net) {
                    foundNet = TRUE;
                    break;
                }
            }
            if (!foundNet)
                continue;
        }
 
        for (repeat_i = 0; repeat_i < repeat_X; repeat_i++) {
            for (repeat_j = 0; repeat_j < repeat_Y; repeat_j++) {
                double sr_x = repeat_i * repeat_dist_X;
                double sr_y = repeat_j * repeat_dist_Y;
 
                if ((useOptimizations)
                    && ((net->boundingBox.right + sr_x < minX) || (net->boundingBox.left + sr_x > maxX)
                        || (net->boundingBox.top + sr_y < minY) || (net->boundingBox.bottom + sr_y > maxY))) {
                    continue;
                }
 
                /*
                 * If circle segment, scale and translate that one too
                 */
                if (net->cirseg) {
                    tempX = net->cirseg->width;
                    tempY = net->cirseg->height;
                    cairo_matrix_transform_point(&scaleMatrix, &tempX, &tempY);
 
                    /* Variables can be negative after transformation */
                    tempX      = fabs(tempX);
                    tempY      = fabs(tempY);
                    cir_width  = tempX;
                    cir_height = tempY;
 
                    tempX = net->cirseg->cp_x;
                    tempY = net->cirseg->cp_y;
                    cairo_matrix_transform_point(&fullMatrix, &tempX, &tempY);
                    cp_x = (int)round(tempX);
                    cp_y = (int)round(tempY);
                }
 
                /*
                 * Set GdkFunction depending on if this (gerber) layer is inverted
                 * and allow for the photoplot being negative.
                 */
                gdk_gc_set_function(gc, GDK_COPY);
                if ((net->layer->polarity == GERBV_POLARITY_CLEAR) != (polarity == GERBV_POLARITY_NEGATIVE))
                    gdk_gc_set_foreground(gc, &opaque);
                else
                    gdk_gc_set_foreground(gc, &transparent);
 
                /*
                 * Polygon Area Fill routines
                 */
                switch (net->interpolation) {
                    case GERBV_INTERPOLATION_PAREA_START:
                        draw_gdk_render_polygon_object(
                            net, image, sr_x, sr_y, &fullMatrix, &scaleMatrix, gc, pgc, pixmap
                        );
                        continue;
                    /* make sure we completely skip over any deleted nodes */
                    case GERBV_INTERPOLATION_DELETED: continue;
                    default: break;
                }
 
                /*
                 * If aperture state is off we allow use of undefined apertures.
                 * This happens when gerber files starts, but hasn't decided on
                 * which aperture to use.
                 */
                if (image->aperture[net->aperture] == NULL) {
                    /* Commenting this out since it gets emitted every time you click on the screen
                       if (net->aperture_state != GERBV_APERTURE_STATE_OFF)
                       GERB_MESSAGE("Aperture D%d is not defined", net->aperture);
                    */
                    continue;
                }
 
                /*
                 * Scale points with window scaling and translate them
                 */
                tempX = net->start_x + sr_x;
                tempY = net->start_y + sr_y;
                cairo_matrix_transform_point(&fullMatrix, &tempX, &tempY);
                xlong1 = (int)round(tempX);
                ylong1 = (int)round(tempY);
 
                tempX = net->stop_x + sr_x;
                tempY = net->stop_y + sr_y;
                cairo_matrix_transform_point(&fullMatrix, &tempX, &tempY);
                xlong2 = (int)round(tempX);
                ylong2 = (int)round(tempY);
 
                /* if the object is way outside our view window, just skip over it in order
                   to eliminate some GDK clipping problems at high zoom levels */
                if ((xlong1 < -10000) && (xlong2 < -10000))
                    continue;
                if ((ylong1 < -10000) && (ylong2 < -10000))
                    continue;
                if ((xlong1 > 10000) && (xlong2 > 10000))
                    continue;
                if ((ylong1 > 10000) && (ylong2 > 10000))
                    continue;
 
                if (xlong1 > G_MAXINT)
                    x1 = G_MAXINT;
                else if (xlong1 < G_MININT)
                    x1 = G_MININT;
                else
                    x1 = (int)xlong1;
 
                if (xlong2 > G_MAXINT)
                    x2 = G_MAXINT;
                else if (xlong2 < G_MININT)
                    x2 = G_MININT;
                else
                    x2 = (int)xlong2;
 
                if (ylong1 > G_MAXINT)
                    y1 = G_MAXINT;
                else if (ylong1 < G_MININT)
                    y1 = G_MININT;
                else
                    y1 = (int)ylong1;
 
                if (ylong2 > G_MAXINT)
                    y2 = G_MAXINT;
                else if (ylong2 < G_MININT)
                    y2 = G_MININT;
                else
                    y2 = (int)ylong2;
 
                switch (net->aperture_state) {
                    case GERBV_APERTURE_STATE_ON:
                        tempX = image->aperture[net->aperture]->parameter[0];
                        cairo_matrix_transform_point(&scaleMatrix, &tempX, &tempY);
 
                        /* Variables can be negative after transformation */
                        tempX = fabs(tempX);
                        p1    = (int)round(tempX);
 
                        gdk_gc_set_line_attributes(
                            gc, p1, GDK_LINE_SOLID,
                            (image->aperture[net->aperture]->type == GERBV_APTYPE_RECTANGLE) ? GDK_CAP_PROJECTING
                                                                                             : GDK_CAP_ROUND,
                            GDK_JOIN_MITER
                        );
 
                        switch (net->interpolation) {
                            case GERBV_INTERPOLATION_LINEARx10:
                            case GERBV_INTERPOLATION_LINEARx01:
                            case GERBV_INTERPOLATION_LINEARx001:
                                GERB_MESSAGE(_("Linear != x1"));
                                gdk_gc_set_line_attributes(gc, p1, GDK_LINE_ON_OFF_DASH, GDK_CAP_ROUND, GDK_JOIN_MITER);
                                gdk_draw_line(*pixmap, gc, x1, y1, x2, y2);
                                gdk_gc_set_line_attributes(gc, p1, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_MITER);
                                break;
                            case GERBV_INTERPOLATION_LINEARx1:
                                if (image->aperture[net->aperture]->type != GERBV_APTYPE_RECTANGLE) {
                                    gdk_draw_line(*pixmap, gc, x1, y1, x2, y2);
 
                                    if (renderInfo->show_cross_on_drill_holes
                                        && image->layertype == GERBV_LAYERTYPE_DRILL) {
                                        /* Draw crosses on drill slot start and end */
                                        r = p1 / 2.0 + hole_cross_inc_px;
                                        draw_gdk_cross(*pixmap, gc, x1, y1, r);
                                        draw_gdk_cross(*pixmap, gc, x2, y2, r);
                                    }
                                    break;
                                }
 
                                gint     dx, dy;
                                GdkPoint poly[6];
 
                                tempX = image->aperture[net->aperture]->parameter[0] / 2;
                                tempY = image->aperture[net->aperture]->parameter[1] / 2;
                                cairo_matrix_transform_point(&scaleMatrix, &tempX, &tempY);
                                dx = (int)round(tempX);
                                dy = (int)round(tempY);
 
                                if (x1 > x2)
                                    dx = -dx;
                                if (y1 > y2)
                                    dy = -dy;
                                poly[0].x = x1 - dx;
                                poly[0].y = y1 - dy;
                                poly[1].x = x1 - dx;
                                poly[1].y = y1 + dy;
                                poly[2].x = x2 - dx;
                                poly[2].y = y2 + dy;
                                poly[3].x = x2 + dx;
                                poly[3].y = y2 + dy;
                                poly[4].x = x2 + dx;
                                poly[4].y = y2 - dy;
                                poly[5].x = x1 + dx;
                                poly[5].y = y1 - dy;
                                gdk_draw_polygon(*pixmap, gc, 1, poly, 6);
                                break;
 
                            case GERBV_INTERPOLATION_CW_CIRCULAR:
                            case GERBV_INTERPOLATION_CCW_CIRCULAR:
                                gerbv_gdk_draw_arc(
                                    *pixmap, gc, cp_x, cp_y, cir_width, cir_height,
                                    net->cirseg->angle1 + RAD2DEG(transform.rotation),
                                    net->cirseg->angle2 + RAD2DEG(transform.rotation)
                                );
                                break;
                            default:
                                GERB_COMPILE_WARNING(_("Skipped interpolation type %d"), net->interpolation);
                                break;
                        }
                        break;
                    case GERBV_APERTURE_STATE_OFF: break;
                    case GERBV_APERTURE_STATE_FLASH:
                        tempX = image->aperture[net->aperture]->parameter[0];
                        tempY = image->aperture[net->aperture]->parameter[1];
                        cairo_matrix_transform_point(&scaleMatrix, &tempX, &tempY);
 
                        /* Variables can be negative after transformation */
                        tempX = fabs(tempX);
                        tempY = fabs(tempY);
                        p1    = (int)round(tempX);
                        p2    = (int)round(tempY);
 
                        switch (image->aperture[net->aperture]->type) {
                            case GERBV_APTYPE_CIRCLE:
                                gerbv_gdk_draw_circle(*pixmap, gc, TRUE, x2, y2, p1);
 
                                if (renderInfo->show_cross_on_drill_holes
                                    && image->layertype == GERBV_LAYERTYPE_DRILL) {
                                    r = p1 / 2.0 + hole_cross_inc_px;
                                    draw_gdk_cross(*pixmap, gc, x2, y2, r);
                                }
 
                                /*
                                 * If circle has an inner diameter we must remove
                                 * that part of the circle to make a hole in it.
                                 * We should actually support square holes too,
                                 * but due to laziness I don't.
                                 */
                                if (p2) {
                                    gdk_gc_get_values(gc, &gc_values);
                                    if (gc_values.foreground.pixel == opaque.pixel) {
                                        gdk_gc_set_foreground(gc, &transparent);
                                        gerbv_gdk_draw_circle(*pixmap, gc, TRUE, x2, y2, p2);
                                        gdk_gc_set_foreground(gc, &opaque);
                                    } else {
                                        gdk_gc_set_foreground(gc, &opaque);
                                        gerbv_gdk_draw_circle(*pixmap, gc, TRUE, x2, y2, p2);
                                        gdk_gc_set_foreground(gc, &transparent);
                                    }
                                }
 
                                break;
                            case GERBV_APTYPE_RECTANGLE:
                                gerbv_gdk_draw_rectangle(
                                    *pixmap, gc, TRUE, x2, y2, p1, p2,
                                    RAD2DEG(transform.rotation + image->info->imageRotation)
                                );
                                break;
                            case GERBV_APTYPE_OVAL:
                                gerbv_gdk_draw_oval(
                                    *pixmap, gc, TRUE, x2, y2, p1, p2,
                                    RAD2DEG(transform.rotation + image->info->imageRotation)
                                );
                                break;
                            case GERBV_APTYPE_POLYGON:
                                /* TODO: gdk_draw_polygon() */
                                gerbv_gdk_draw_circle(*pixmap, gc, TRUE, x2, y2, p1);
                                break;
                            case GERBV_APTYPE_MACRO:
                                /* TODO: check line22 and others */
                                gerbv_gdk_draw_amacro(
                                    *pixmap, gc, image->aperture[net->aperture]->simplified, scale, x2, y2
                                );
                                break;
                            default:
                                GERB_MESSAGE(_("Unknown aperture type %d"), image->aperture[net->aperture]->type);
                                return 0;
                        }
                        break;
                    default: GERB_MESSAGE(_("Unknown aperture state %d"), net->aperture_state); return 0;
                }
            }
        }
    }
    /*
     * Destroy GCs before exiting
     */
    gdk_gc_unref(gc);
    gdk_gc_unref(pgc);
 
    return 1;
 
} /* image2pixmap */