1 files changed, 33 insertions, 0 deletions
diff --git a/AnimationRender/F_Interpolate.c b/AnimationRender/F_Interpolate.c
new file mode 100644
index 0000000..cc72163
--- /dev/null
+++ b/AnimationRender/F_Interpolate.c
@@ -0,0 +1,33 @@
+#include "F_Interpolate.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void Interpolate_callback(Interpolate* self, struct FrameContext* fc) {
+	if (self->interpolate == NULL) {
+		fprintf(stderr, "Interpolation function cannot be NULL!\n");
+		return;
+	}
+
+	double p = (double)(fc->frame - fc->startFrame) / (fc->endFrame - fc->startFrame);
+
+	if (0.0 <= p && p <= 1.0)
+		self->interpolate(self->value, self->startValue, self->endValue, p);
+}
+
+FrameCallback* Interpolate_setup(Interpolate obj) {
+	FrameCallback* fca = malloc(sizeof(struct FrameCallback));
+
+	fca->callback = (FrameCallback_callback)Interpolate_callback;
+	fca->callback_self = malloc(sizeof(obj));
+	memcpy(fca->callback_self, &obj, sizeof(obj));
+
+	return fca;
+}
+
+#define NUM_INTERPOLATE(a, b, perc) ((a) * (1.0 - (perc)) + (b) * (perc))
+
+void Interpolate_TransformCenter(TransformCenter* value, const TransformCenter* start, const TransformCenter* end, double progress) {
+	value->centerX = NUM_INTERPOLATE(start->centerX, end->centerX, progress);
+	value->centerY = NUM_INTERPOLATE(start->centerY, end->centerY, progress);
+}