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game/math/mathutils.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <stdbool.h>
+
+typedef struct {
+	double x, y;
+} point;
+
+typedef struct {
+	double x, y, w, h;
+} rect;
+
+#define FIELD_RESCALED field->w_meters, field->h_meters, 0, 0
+
+// Rescales field coordinates to pixels
+point scale_to_screen(
+		double x,
+		double y,
+		double w_meters,
+		double h_meters,
+		double x_off,
+		double y_off);
+
+// Rescales pixel coordinates to meters
+point scale_to_field(
+		double x,
+		double y,
+		double w_meters,
+		double h_meters,
+		double x_off,
+		double y_off);
+
+bool within_box(point p, rect r);
+point lerp_point(point a, point b, float p);
+double get_distance(point a, point b);