1 files changed, 91 insertions, 0 deletions
diff --git a/demo.c b/demo.c
new file mode 100644
index 0000000..76473e7
--- /dev/null
+++ b/demo.c
@@ -0,0 +1,91 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+main(void)
+{
+#define P(I) (points[I].x - 0), (points[I].y - 0)
+	/* TODO test drawing outside of raster */
+
+	RTGRPBLIB_RASTER *raster;
+	double *image;
+	size_t x, y, i, j, n;
+	size_t width = 40;
+	size_t height = 30;
+	struct {
+		double x, y;
+	} points[] = {
+#if 0
+		{20, 5},
+		{30, 15},
+		{20, 25},
+		{10, 15}
+#elif 0
+		{20, 5},
+		{35, 15},
+		{20, 25},
+		{5, 15}
+#else
+		{5.25, 5.25},
+		{35.75, 5.25},
+		{35.75, 25.75},
+		{5.25, 25.75}
+#endif
+	};
+
+	raster = rtgrpblib_create_raster(width, height);
+	image  = calloc(width * height, sizeof(*image));
+
+#if 0
+	n = sizeof(points) / sizeof(*points);
+	for (i = 0; i < n; i++) {
+		j = (i + 1) % n;
+		rtgrpblib_draw_linear_bezier(raster, P(i), P(j));
+	}
+#elif 0
+	rtgrpblib_draw_quadratic_bezier(raster, P(2), P(3), P(0));
+	rtgrpblib_draw_linear_bezier(raster, P(0), P(2));
+#else
+	rtgrpblib_draw_cubic_bezier(raster, P(0), P(1), P(2), P(3));
+	rtgrpblib_draw_linear_bezier(raster, P(3), P(0));
+#endif
+
+	rtgrpblib_fill_shapes(image, width, raster);
+
+#if 1
+	printf("\nOutline (area)\n");
+	for (y = 0; y < height; y++) {
+		for (x = 0; x < width; x++)
+			printf(raster->cells[y * width + x].cell_coverage ? "%+.1lf " : " 0   ",
+			       raster->cells[y * width + x].cell_coverage);
+		printf("\n");
+	}
+	printf("\nOutline (shadow)\n");
+	for (y = 0; y < height; y++) {
+		for (x = 0; x < width; x++)
+			printf(raster->cells[y * width + x].opposite_coverage ? "%+.1lf " : " 0   ",
+			       raster->cells[y * width + x].opposite_coverage);
+		printf("\n");
+	}
+	printf("\nFill\n");
+	for (y = 0; y < height; y++) {
+		for (x = 0; x < width; x++) {
+			unsigned val = (unsigned)(image[y * width + x] * 255 + 0.5);
+			printf("%02X ", val - (val == 128));
+		}
+		printf("\n");
+	}
+#else
+	printf("P2\n# %s\n%zu %zu\n255\n", "Note: no gamma correction applied", width, height);
+	for (y = 0; y < height; y++) {
+		for (x = 0; x < width; x++)
+			printf("%i ", (int)(image->cells[y * width + x] * 255 + 0.5));
+		printf("\n");
+	}
+#endif
+
+	free(raster);
+	free(image);
+	return 0;
+}