Rect Circle Intersect

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float circleX, circleY;

float circleRadius = 20;

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float rectX = 100;

float rectY = 100;

float rectWidth = 190;

float rectHeight = 120;

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void setup() {

  size(400, 400); 

  ellipseMode(RADIUS);

  smooth();

}

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void draw() {

  background(204);

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  circleX = mouseX;

  circleY = mouseY;

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  if (rectCircleIntersect(rectX, rectY, rectWidth, rectHeight, circleX, circleY, circleRadius) == true) {

    fill(0); 

  } 

  else {

    fill(255); 

  }

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  rect(rectX, rectY, rectWidth, rectHeight); 

  ellipse(circleX, circleY, circleRadius, circleRadius); 

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}

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boolean rectCircleIntersect(float rx, float ry, float rw, float rh, float cx, float cy, float cr) {

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  float circleDistanceX = abs(cx - rx - rw/2);

  float circleDistanceY = abs(cy - ry - rh/2);

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  if (circleDistanceX > (rw/2 + cr)) { return false; }

  if (circleDistanceY > (rh/2 + cr)) { return false; }

  if (circleDistanceX <= rw/2) { return true; } 

  if (circleDistanceY <= rh/2) { return true; }

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  float cornerDistance = pow(circleDistanceX - rw/2, 2) + pow(circleDistanceY - rh/2, 2);

  return cornerDistance <= pow(cr, 2);

}

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