}
#endif
-#ifdef CAIRO_SUPPORT
-void Polygon::draw(cairo_t* context_resource) {
- cairo_set_line_width(context_resource, 1.0);
- cairo_set_source_rgb (context_resource, _red, _green, _blue);
- cairo_move_to(context_resource, _x[0], _y[0]);
- for(int n = 0; n < _nb_vertices; n++) {
- cairo_line_to(context_resource, _x[n], _y[n]);
- }
- cairo_close_path(context_resource);
- cairo_stroke_preserve(context_resource);
- cairo_fill(context_resource);
+void Polygon::draw(Canvas *canvas) {
+ canvas->set_drawing_color(_red, _green, _blue);
+ canvas->draw_polygon(1, _nb_vertices, _x, _y);
}
-void Polygon::draw_contours(cairo_t* context_resource) {
- cairo_set_line_width(context_resource, 1.0);
- cairo_set_source_rgb (context_resource, 0.0, 0.0, 0.0);
- // cairo_set_source_rgb (context_resource, 1.0, 1.0, 1.0);
- cairo_move_to(context_resource, _x[0], _y[0]);
- for(int n = 0; n < _nb_vertices; n++) {
- cairo_line_to(context_resource, _x[n], _y[n]);
- }
- cairo_close_path(context_resource);
- cairo_stroke(context_resource);
+void Polygon::draw_contours(Canvas *canvas) {
+ canvas->set_drawing_color(0.0, 0.0, 0.0);
+ canvas->draw_polygon(0, _nb_vertices, _x, _y);
}
-#endif
void Polygon::set_vertex(int k, scalar_t x, scalar_t y) {
_relative_x[k] = x;
_nb_polygons = nb_polygons;
- a = _relative_x[_nb_vertices - 1] * _relative_y[0] - _relative_x[0] * _relative_y[_nb_vertices - 1];
+ a = _relative_x[_nb_vertices - 1] * _relative_y[0]
+ - _relative_x[0] * _relative_y[_nb_vertices - 1];
+
for(int n = 0; n < _nb_vertices - 1; n++)
a += _relative_x[n] * _relative_y[n+1] - _relative_x[n+1] * _relative_y[n];
a *= 0.5;