QLcollision

gistfile1.c

#include "vecf.h"
#include "rectf.h"
#include "circlef.h"

#include <assert.h>

int rect_collision(rectf_t left, rectf_t right)
{
	return (left.x + left.width >= right.x
             && left.x <= right.x + right.width
             && left.y + left.height >= right.y
             && left.y <= right.y + right.height);
}

int circ_collision(circlef_t left, circlef_t right)
{
        assert(left.radius >= 0.0f);
        assert(right.radius >= 0.0f);

	float xdelta = left.pos.x - right.pos.x;
	float ydelta = left.pos.y - right.pos.y;
        float rsum = left.radius + right.radius;
	return (xdelta * xdelta + ydelta * ydelta <= rsum * rsum);
}

int p_circ_collision(vec2f_t point, circlef_t circle)
{
	float xdelta = (point.x - circle.x);
	float ydelta = (point.y - circle.y);
	return (xdelta * xdelta + ydelta * ydelta <= circle.radius * circle.radius);
}