added utils.cpp

2021-02-19 18:20:58 +01:00
parent 46164976b6
commit be228c2cfa
2 changed files with 166 additions and 0 deletions
--- a/source/utils.cpp
+++ b/source/utils.cpp
@@ -0,0 +1,112 @@
+#include "utils.h"
+
+// Calcula el cuadrado de la distancia entre dos puntos
+double distanceSquared(int x1, int y1, int x2, int y2)
+{
+    int deltaX = x2 - x1;
+    int deltaY = y2 - y1;
+    return deltaX * deltaX + deltaY * deltaY;
+}
+
+// Detector de colisiones entre dos circulos
+bool checkCollision(Circle &a, Circle &b)
+{
+    // Calcula el radio total al cuadrado
+    int totalRadiusSquared = a.r + b.r;
+    totalRadiusSquared = totalRadiusSquared * totalRadiusSquared;
+
+    // Si la distancia entre el centro de los circulos es inferior a la suma de sus radios
+    if (distanceSquared(a.x, a.y, b.x, b.y) < (totalRadiusSquared))
+    {
+        // Los circulos han colisionado
+        return true;
+    }
+
+    // En caso contrario
+    return false;
+}
+
+// Detector de colisiones entre un circulo y un rectangulo
+bool checkCollision(Circle &a, SDL_Rect &b)
+{
+    //Closest point on collision box
+    int cX, cY;
+
+    //Find closest x offset
+    if (a.x < b.x)
+    {
+        cX = b.x;
+    }
+    else if (a.x > b.x + b.w)
+    {
+        cX = b.x + b.w;
+    }
+    else
+    {
+        cX = a.x;
+    }
+
+    //Find closest y offset
+    if (a.y < b.y)
+    {
+        cY = b.y;
+    }
+    else if (a.y > b.y + b.h)
+    {
+        cY = b.y + b.h;
+    }
+    else
+    {
+        cY = a.y;
+    }
+
+    //If the closest point is inside the circle
+    if (distanceSquared(a.x, a.y, cX, cY) < a.r * a.r)
+    {
+        //This box and the circle have collided
+        return true;
+    }
+
+    //If the shapes have not collided
+    return false;
+}
+
+// Detector de colisiones entre un dos rectangulos
+bool checkCollision(SDL_Rect &a, SDL_Rect &b)
+{
+    //Calculate the sides of rect A
+    int leftA = a.x;
+    int rightA = a.x + a.w;
+    int topA = a.y;
+    int bottomA = a.y + a.h;
+
+    //Calculate the sides of rect B
+    int leftB = b.x;
+    int rightB = b.x + b.w;
+    int topB = b.y;
+    int bottomB = b.y + b.h;
+
+    //If any of the sides from A are outside of B
+    if (bottomA <= topB)
+    {
+        return false;
+    }
+
+    if (topA >= bottomB)
+    {
+        return false;
+    }
+
+    if (rightA <= leftB)
+    {
+        return false;
+    }
+
+    if (leftA >= rightB)
+    {
+        return false;
+    }
+
+    //If none of the sides from A are outside B
+    return true;
+}