basic game logic with simple translation animation

ui.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include "zephr_math.h"
+
+typedef enum Alignment {
+  ALIGN_TOP_LEFT,
+  ALIGN_TOP_CENTER,
+  ALIGN_TOP_RIGHT,
+  ALIGN_LEFT_CENTER,
+  ALIGN_CENTER,
+  ALIGN_RIGHT_CENTER,
+  ALIGN_BOTTOM_LEFT,
+  ALIGN_BOTTOM_CENTER,
+  ALIGN_BOTTOM_RIGHT,
+} Alignment;
+
+typedef enum UIConstraint {
+  UI_CONSTRAINT_FIXED,
+  UI_CONSTRAINT_RELATIVE,
+  UI_CONSTRAINT_RELATIVE_PIXELS,
+  UI_CONSTRAINT_ASPECT_RATIO,
+} UIConstraint;
+
+typedef struct UIConstraints {
+  float x;
+  float y;
+  float width;
+  float height;
+  float rotation;
+  struct UIConstraints *parent;
+} UIConstraints;
+
+int init_ui(const char* font_path, Size window_size);
+void set_parent_constraint(UIConstraints *constraints, UIConstraints *parent_constraints);
+void set_x_constraint(UIConstraints *constraints, float value, UIConstraint type);
+void set_y_constraint(UIConstraints *constraints, float value, UIConstraint type);
+void set_width_constraint(UIConstraints *constraints, float value, UIConstraint type);
+void set_height_constraint(UIConstraints *constraints, float value, UIConstraint type);
+void set_rotation_constraint(UIConstraints *constraints, float angle_d);
+void apply_constraints(UIConstraints *constraints, Vec2f *pos, Sizef *size);
+void apply_alignment(Alignment align, UIConstraints *constraints, Vec2f *pos, Sizef size);
+void draw_quad(UIConstraints *constraints, const Color color, float border_radius, Alignment align);
+void draw_circle(UIConstraints *constraints, const Color color, Alignment align);
+void draw_triangle(UIConstraints *constraints, const Color color, Alignment align);