constraints for text. added rotation constraint and rotate around center of elements

z_math.h

@@ -0,0 +1,32 @@
+#pragma once
+
+typedef struct {
+    float m[4][4];
+} Matrix4x4;
+
+typedef struct Size {
+  int width;
+  int height;
+} Size;
+
+typedef struct Sizef {
+  float width;
+  float height;
+} Sizef;
+
+typedef struct Vec2 {
+  int x;
+  int y;
+} Vec2;
+
+typedef struct Vec2f {
+  float x;
+  float y;
+} Vec2f;
+
+typedef struct Color {
+  float r;
+  float g;
+  float b;
+  float a;
+} Color;