move

1 files changed, 36 insertions, 0 deletions

diff --git a/rand.c b/rand.c
new file mode 100644
index 0000000..da450f6
--- /dev/null
+++ b/rand.c
@@ -0,0 +1,36 @@
+#include <stdlib.h>
+#include <time.h>
+
+#include "balls.h"
+
+static float randFloat(float lo, float hi);
+
+float2
+randPtInRect(Rectangle r) {
+	float2 pt = {
+		randFloat(r.min[0], r.max[0]),
+		randFloat(r.min[1], r.max[1])
+	};
+	return pt;
+}
+
+float2
+randVec(float xmin, float xmax, float ymin, float ymax) {
+	float2 v = {randFloat(xmin, xmax), randFloat(ymin, ymax)};
+	return v;
+}
+
+static float
+randFloat(float lo, float hi) {
+	float r, diff;
+	static int isInitialized = 0;
+
+	if (!isInitialized) { /* First call. */
+		srand(time(0));
+		isInitialized = 1;
+	}
+
+	r = (float) rand() / RAND_MAX;
+	diff = hi - lo;
+	return lo + r*diff;
+}