Create Collision_-_CircleRectCollide.c

Collision_-_CircleRectCollide.c

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+
+#include "raylib.h"
+
+
+// These are the circlerect collision function. The clamp one is needed for the circlerectcollide.
+static bool circlerectcollide(int cx,int cy,int cr, int rx, int ry,int rw,int rh);
+static float Clamp(float value, float min, float max);
+    
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib example.");
+ 
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        
+        Rectangle r=(Rectangle){GetMouseX(),GetMouseY(),128,64};
+        Vector2 c=(Vector2){400,200};
+        float cr=50;
+        //----------------------------------------------------------------------------------
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+ 
+            DrawRectangle(r.x,r.y,r.width,r.height,BLACK);
+            DrawCircle(c.x,c.y,cr,BLUE);
+
+            if(circlerectcollide(c.x,c.y,cr,r.x,r.y,r.width,r.height)){
+                DrawText("COLLISION..",20,0,30,RED);
+            }
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+
+
+}
+
+bool circlerectcollide(int cx,int cy,int cr, int rx, int ry,int rw,int rh){
+    float closestx = Clamp(cx, rx, rx+rw);
+    float closesty = Clamp(cy, ry, ry+rh);
+    float distancex = cx - closestx;
+    float distancey = cy - closesty;
+    float distancesquared = (distancex * distancex) + (distancey * distancey);
+    return distancesquared < (cr * cr);
+}
+
+// Clamp float value
+float Clamp(float value, float min, float max)
+{
+    const float res = value < min ? min : value;
+    return res > max ? max : res;
+}