You don't need to use sqrt here. Sqrt is expensive.
// POINT/CIRCLE
boolean pointCircle(float px, float py, float cx, float cy, float r) {
// get distance between the point and circle's center
// using the Pythagorean Theorem
float distX = px - cx;
float distY = py - cy;
float distance = sqrt( (distX*distX) + (distY*distY) );
// if the distance is less than the circle's
// radius the point is inside!
if (distance <= r) {
return true;
}
return false;
}
You can just compare the squares easier and faster:
return distX*distX + distY*distY <= r*r;
You don't need to use sqrt here. Sqrt is expensive.
You can just compare the squares easier and faster:
return distX*distX + distY*distY <= r*r;(Thanks for the book!)