Initial (terrible) commit

include/hexagram/anim.h

@@ -0,0 +1,52 @@
+#ifndef _HEXAGRAM_ANIM_H
+#define _HEXAGRAM_ANIM_H
+
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <hexagram/gauge.h>
+#include <hexagram/dial.h>
+
+typedef enum {
+    HEXAGRAM_ANIM_MOVE   = 1 << 0,
+    HEXAGRAM_ANIM_ALPHA  = 1 << 1,
+    HEXAGRAM_ANIM_RADIUS = 1 << 2
+} hexagram_anim_flags;
+
+typedef struct _hexagram_anim_action {
+    int flags;
+
+    union {
+        hexagram_gauge *gauge;
+        hexagram_dial *dial;
+    };
+
+    struct {
+        struct {
+            double x, y;
+        };
+
+        double alpha;
+        double radius;
+    } from, to;
+} hexagram_anim_action;
+
+typedef struct _hexagram_anim_stop {
+    hexagram_anim_action *actions;
+    size_t actionc;
+    double duration_s;
+} hexagram_anim_stop;
+
+typedef struct _hexagram_anim {
+    hexagram_anim_stop *stops;
+    size_t count, current;
+    struct timeval start, now;
+} hexagram_anim;
+
+void hexagram_anim_init(hexagram_anim *anim);
+
+int hexagram_anim_step(hexagram_anim *anim, cairo_t *bg, cairo_t *fg);
+
+double hexagram_anim_duration(hexagram_anim *anim);
+
+#endif /* _HEXAGRAM_ANIM_H */

src/anim.c

@@ -0,0 +1,13 @@
+#include <stdlib.h>
+
+#include <hexagram/anim.h>
+
+void hexagram_anim_init(hexagram_anim *anim) {
+    anim->current = 0;
+
+    gettimeofday(&anim->start, NULL);
+}
+
+int hexagram_anim_step(hexagram_anim *anim, cairo_t *bg, cairo_t *fg) {
+
+}