static public bool RectToCircle(float rectX, float rectY, float rectWidth, float rectHeight,
Vector2 circleCenter, float radius)
{
//Check if the rectangle contains the circle's center-point
if (Collisions.RectToPoint(rectX, rectY, rectWidth, rectHeight, circleCenter))
{
return(true);
}
// Check the circle against the relevant edges
Vector2 edgeFrom;
Vector2 edgeTo;
var sector = GetSector(rectX, rectY, rectWidth, rectHeight, circleCenter);
if ((sector & PointSectors.Top) != 0)
{
edgeFrom = new Vector2(rectX, rectY);
edgeTo = new Vector2(rectX + rectWidth, rectY);
if (CircleToLine(circleCenter, radius, edgeFrom, edgeTo))
{
return(true);
}
}
if ((sector & PointSectors.Bottom) != 0)
{
edgeFrom = new Vector2(rectX, rectY + rectHeight);
edgeTo = new Vector2(rectX + rectWidth, rectY + rectHeight);
if (CircleToLine(circleCenter, radius, edgeFrom, edgeTo))
{
return(true);
}
}
if ((sector & PointSectors.Left) != 0)
{
edgeFrom = new Vector2(rectX, rectY);
edgeTo = new Vector2(rectX, rectY + rectHeight);
if (CircleToLine(circleCenter, radius, edgeFrom, edgeTo))
{
return(true);
}
}
if ((sector & PointSectors.Right) != 0)
{
edgeFrom = new Vector2(rectX + rectWidth, rectY);
edgeTo = new Vector2(rectX + rectWidth, rectY + rectHeight);
if (CircleToLine(circleCenter, radius, edgeFrom, edgeTo))
{
return(true);
}
}
return(false);
}
static public bool rectToLine(float rectX, float rectY, float rectWidth, float rectHeight, Vector2 lineFrom, Vector2 lineTo)
{
var fromSector = Collisions.getSector(rectX, rectY, rectWidth, rectHeight, lineFrom);
var toSector = Collisions.getSector(rectX, rectY, rectWidth, rectHeight, lineTo);
if (fromSector == PointSectors.Center || toSector == PointSectors.Center)
{
return(true);
}
else if ((fromSector & toSector) != 0)
{
return(false);
}
else
{
var both = fromSector | toSector;
// Do line checks against the edges
Vector2 edgeFrom;
Vector2 edgeTo;
if ((both & PointSectors.Top) != 0)
{
edgeFrom = new Vector2(rectX, rectY);
edgeTo = new Vector2(rectX + rectWidth, rectY);
if (Collisions.lineToLine(edgeFrom, edgeTo, lineFrom, lineTo))
{
return(true);
}
}
if ((both & PointSectors.Bottom) != 0)
{
edgeFrom = new Vector2(rectX, rectY + rectHeight);
edgeTo = new Vector2(rectX + rectWidth, rectY + rectHeight);
if (Collisions.lineToLine(edgeFrom, edgeTo, lineFrom, lineTo))
{
return(true);
}
}
if ((both & PointSectors.Left) != 0)
{
edgeFrom = new Vector2(rectX, rectY);
edgeTo = new Vector2(rectX, rectY + rectHeight);
if (Collisions.lineToLine(edgeFrom, edgeTo, lineFrom, lineTo))
{
return(true);
}
}
if ((both & PointSectors.Right) != 0)
{
edgeFrom = new Vector2(rectX + rectWidth, rectY);
edgeTo = new Vector2(rectX + rectWidth, rectY + rectHeight);
if (Collisions.lineToLine(edgeFrom, edgeTo, lineFrom, lineTo))
{
return(true);
}
}
}
return(false);
}