Create Collision_-_LinesegCircleCollide.c

Collision_-_LinesegCircleCollide.c

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+
+#include "raylib.h"
+#include <math.h>
+
+static bool linecirclecollide(int sx1, int sy1, int sx2, int sy2, int cx, int cy, float cr);
+
+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
+        //----------------------------------------------------------------------------------
+        
+        Vector2 linea=(Vector2){GetMouseX(),GetMouseY()};
+        Vector2 lineb=(Vector2){linea.x-100,linea.y+50};
+        Vector2 circle=(Vector2){400,200};
+        float circleradius = 50;
+        
+        //----------------------------------------------------------------------------------
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+            
+            DrawLine(linea.x,linea.y,lineb.x,lineb.y,RED);
+            DrawCircle(circle.x,circle.y,circleradius,YELLOW);
+            
+            if(linecirclecollide(linea.x,linea.y,lineb.x,lineb.y,circle.x,circle.y,circleradius))
+            DrawText("Something is a foot..",10,10,30,BLUE);
+        
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+
+
+}
+
+
+//'
+//' Line(segment) to Circle Collision//
+//'
+bool linecirclecollide(int x1, int y1, int x2, int y2, int xc, int yc, float r){
+
+    float xd = 0.0f;
+    float yd = 0.0f;
+    float t = 0.0f;
+    float d = 0.0f;
+    float dx = 0.0f;
+    float dy = 0.0f;
+
+    dx = x2 - x1;
+    dy = y2 - y1;
+
+    t = ((yc - y1) * dy + (xc - x1) * dx) / (dy * dy + dx * dx);
+
+    if(0 <= t && t <= 1)
+    {
+        xd = x1 + t * dx;
+        yd = y1 + t * dy;
+
+        d = sqrt((xd - xc) * (xd - xc) + (yd - yc) * (yd - yc));
+        return d <= r;
+    }
+    else
+    {
+        d = sqrt((xc - x1) * (xc - x1) + (yc - y1) * (yc - y1));
+        if(d <= r)
+        {
+            return true;
+        }
+        else
+        {
+            d = sqrt((xc - x2) * (xc - x2) + (yc - y2) * (yc - y2));
+            if(d <= r)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+            
+        }
+    }
+
+}