// Ellipse Collisions
bool PhysicsProcessor::collidedRectangleEllipse(Vector2d<float> pos1, Vector2d<float> dims,Vector2d<float> pos2, float r1, float r2)
{
// If the bounding boxes don't collide then the circle can't collide.
/* lastCollisionA.ticks = timer->getTicks();
lastCollisionA.hasCollided = false;
lastCollisionB.ticks = lastCollisionA.ticks;
lastCollisionB.hasCollided = false;*/
// 1st we create bounding boxes for the circle and do a Rectangle test against the Rectangle.
if(collidedRectangleRectangle(pos1, dims,pos2, Vector2d<float>(2*r1,2*r2)))
{
// Check the tallest extremites
if(collidedLineRectangle(pos2 - Vector2d<float>(0.0f,r2),pos2 + Vector2d<float>(0.0f,r2),pos1,dims )
|| collidedLineRectangle(pos2 - Vector2d<float>(r1,0.0f),pos2 + Vector2d<float>(r1,0.0f),pos1,dims)
)
return true;
/// NOTE we are cheating the result for now.
float meanR = r1 + r2 * 0.5f;
// If the boxes overlap do a radial distance check
Vector2d<float> diff = pos2 - pos1;
float meanDim = dims.x + dims.y * 0.5f;
if(diff.lengthSquared() <= (meanDim*meanDim) + (r2*r2))
{
//lastCollision.hasCollided = true;
return true;
}
//return true;
}
return false;
}
/// Circle Collisions
bool PhysicsProcessor::collidedCircleCircle(Vector2d<float> pos1, float r1,Vector2d<float> pos2, float r2)
{
// If the bounding boxes don't collide then the circle can't collide.
/*lastCollisionA.ticks = timer->getTicks();
lastCollisionA.hasCollided = false;
lastCollisionB.ticks = lastCollisionA.ticks;
lastCollisionB.hasCollided = false;*/
// 1st we create bounding boxes for each circle and do a Rectangle test
if(collidedRectangleRectangle(pos1, Vector2d<float> (2*r1,2*r1),pos2, Vector2d<float>(2*r2,2*r2)))
{
// If the boxes overlap do a radial distance check
Vector2d<float> diff = pos2 - pos1;
if(diff.lengthSquared() <= (r1*r1) + (r2*r2))
{
//lastCollisionA.hasCollided = true;
//lastCollisionB.hasCollided = true;
return true;
}
}
return false;
}
/// Point Collisions
// Check if a point is on a Line
bool PhysicsProcessor::collidedPointLine(Vector2d<float> point,Vector2d<float> lineStart, Vector2d<float> lineEnd)
{
// Check if the point is actually lineStart or lineEnd
if(point == lineStart or point == lineEnd)
{
/* lastCollisionA.contactPoint = point;
lastCollisionA.hasCollided = true;
lastCollisionA.ticks = timer->getTicks();*/
return true;
}
// Check if line is horizontal or vertical
// Then we can make quick checks
if(lineStart.x == lineEnd.x == point.x)
{
// Line vertical
if(point.y >= lineStart.y and point.y <= lineEnd.y)
{
/*lastCollisionA.contactPoint = point;
lastCollisionA.hasCollided = true;
lastCollisionA.ticks = timer->getTicks();*/
return true;
}
}
else if(lineStart.y == lineEnd.y == point.y)
{
// line horizontal
if(point.x >= lineStart.x and point.x <= lineEnd.x)
{
/*lastCollisionA.contactPoint = point;
lastCollisionA.hasCollided = true;
lastCollisionA.ticks = timer->getTicks();*/
return true;
}
}
Vector2d<float> AB = lineEnd-lineStart;
Vector2d<float> AC = point-lineStart;
float magAB = AB.lengthSquared();
float magAC = AC.lengthSquared();
// If one vector is greater in magnitude than the other, then point is not on the line.
if(magAC > magAB)
{
/*lastCollisionA.contactPoint = point;
lastCollisionA.hasCollided = false;
lastCollisionA.ticks = timer->getTicks();*/
return false;
}
// Now take unit vectors and see if the directions match
AB.normalise();
AC.normalise();
AB = AC - AB;
// Same direction so collision has occurred
if(AB.lengthSquared() == 0)
{
/*lastCollisionA.contactPoint = point;
lastCollisionA.hasCollided = true;
lastCollisionA.ticks = timer->getTicks();*/
return true;
}
/*lastCollisionA.contactPoint = point;
lastCollisionA.hasCollided = false;
lastCollisionA.ticks = timer->getTicks();*/
return false;
}
