Improve drag input detection

game/input.h

@@ -3,6 +3,7 @@
 
 #include <breeze.h>
 #include <flecs.h>
+#include <raymath.h>
 
 #include "components.h"
 
@@ -17,7 +18,7 @@ typedef enum InputType {
 
 #define MOUSE_BUTTON_COUNT (MOUSE_BUTTON_BACK + 1)
 
-#define CLICK_LIMIT 0.12f
+#define DRAG_THRESHOLD 5
 #define BUTTON_COUNT (MOUSE_BUTTON_BACK + 1)
 
 typedef struct InputMapping {
@@ -105,18 +106,26 @@ static void updateInputState(InputState *state, const Camera2D camera, const f32
     state->mouseWorld = mouseWorld;
 }
 
+static f32 inputMouseDelta(const InputState *state) {
+    Vector2 start = state->mouseDown;
+    Vector2 end = state->mouse;
+    f32 dst = Vector2DistanceSqr(start, end);
+    return dst;
+}
+
 static bool isInputBtnDragged(const InputState *state, const MouseButton btn) {
-    return IsMouseButtonDown(btn) && state->mouseDownElapsed[btn] > CLICK_LIMIT;
+    if (!IsMouseButtonDown(btn)) return false;
+    return inputMouseDelta(state) >= DRAG_THRESHOLD;
 }
 static bool isInputBtnJustDragged(const InputState *state, const MouseButton btn) {
-    return IsMouseButtonReleased(btn) && state->mouseDownElapsed[btn] > CLICK_LIMIT;
+    if (!IsMouseButtonReleased(btn)) return false;
+    return inputMouseDelta(state) >= DRAG_THRESHOLD;
 }
 static bool isInputBtnJustDown(const InputState *state, const MouseButton btn) {
-    BZ_UNUSED(state);
-    return IsMouseButtonPressed(btn);
+    return IsMouseButtonPressed(btn) && inputMouseDelta(state) < DRAG_THRESHOLD;
 }
 static bool isInputBtnJustUp(const InputState *state, const MouseButton btn) {
-    return IsMouseButtonReleased(btn) && state->mouseDownElapsed[btn] <= CLICK_LIMIT;
+    return IsMouseButtonReleased(btn) && inputMouseDelta(state) < DRAG_THRESHOLD;
 }
 static bool isInputBtnDown(const InputState *state, const MouseButton btn) {
     BZ_UNUSED(state);