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cairo_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 200, 50); cr = cairo_create(cairo_surface); cairo_pattern_t *gradient; gradient = cairo_pattern_create_linear(0, 0, 200, 0); cairo_pattern_add_color_stop_rgb(gradient, 0.0, 1.0, 0.0, 0.0); cairo_pattern_add_color_stop_rgb(gradient, 0.25, 0.0, 1.0, 0.0); cairo_pattern_add_color_stop_rgb(gradient, 0.75, 0.0, 1.0, 0.0); cairo_pattern_add_color_stop_rgb(gradient, 1.0, 1.0, 0.0, 0.0); cairo_set_source(cr, gradient); cairo_rectangle (cr, 0, 0, 200, 50); cairo_fill(cr); cairo_surface_write_to_png(cairo_surface, "result_linear_gradient.png");
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