refactor graphics functions

1 files changed, 35 insertions, 0 deletions

diff --git a/graphics.c b/graphics.c
new file mode 100644
index 0000000..c03dc8e
--- /dev/null
+++ b/graphics.c
@@ -0,0 +1,35 @@
+#include "balls.h"
+
+void
+drawbg(Image *walls, Image *bg) {
+	draw(screen, screen->r, walls, nil, ZP);
+	draw(screen, screen->r, bg, nil, ZP);
+	flushimage(display, Refnone);
+}
+
+Image *
+alloccircle(int fg, int bg) {
+	Image *m, *fill;
+
+	m = allocimage(display, Rect(0, 0, 2*RADIUS, 2*RADIUS), RGBA32, 0, bg);
+	if (m == nil)
+		return nil;
+
+	fill = allocimage(display, Rect(0, 0, 1, 1), RGBA32, 1, fg);
+	if (fill == nil) {
+		free(m);
+		return nil;
+	}
+
+	fillellipse(m, Pt(RADIUS, RADIUS), RADIUS, RADIUS, fill, ZP);
+	freeimage(fill);
+	return m;
+}
+
+void
+drawcircle(Image *m, Point pos) {
+	Rectangle r;
+
+	r = Rpt(subpt(pos, Pt(RADIUS, RADIUS)), addpt(pos, Pt(RADIUS, RADIUS)));
+	draw(screen, r, m, nil, ZP);
+}