/// <summary>
/// Clips the rects so that the destination's bitmap's clipping boundaries aren't exceeded.
/// If the destination rect needs to be clipped, the source rect must be clipped accordingly.
/// </summary>
/// <param name="a_rctSrc">The rect to blit</param>
/// <param name="a_rctDst">The requested destination rect</param>
/// <param name="a_rctDstClip">The destination clipping rect</param>
/// <param name="a_rctNewSrc">The resulting source rect</param>
/// <param name="a_rctNewDst">The resulting destination rect</param>
static private void CalcClippedRects(
ERectangle a_rctSrc, ERectangleF a_rctDst, ERectangle a_rctDstClip,
out ERectangle a_rctNewSrc, out ERectangle a_rctNewDst)
{
ERectangleF rctNewDstTmp = a_rctDst.Copy();
//a_rctDstClip - the srcClip of the dest sprite
ERectangleF rctDstClipTmp = new ERectangleF((float)a_rctDstClip.X, (float)a_rctDstClip.Y, (float)a_rctDstClip.Width, (float)a_rctDstClip.Height);
rctNewDstTmp.Intersect(rctDstClipTmp);
a_rctNewDst = new ERectangle((int)rctNewDstTmp.X, (int)rctNewDstTmp.Y, (int)rctNewDstTmp.Width, (int)rctNewDstTmp.Height);
//and if so, the src clip must be adjusted accordingly:
ERectangleF rctDiff = new ERectangleF(
rctNewDstTmp.Left - a_rctDst.Left,
rctNewDstTmp.Top - a_rctDst.Top,
rctNewDstTmp.Width - a_rctDst.Width,
rctNewDstTmp.Height - a_rctDst.Height);
PointF pntScale = new PointF(a_rctSrc.Width / a_rctDst.Width, a_rctSrc.Height / a_rctDst.Height);
ERectangle rctTmpSrcClip = a_rctSrc.Copy();
rctTmpSrcClip.X = a_rctSrc.X + (int)(pntScale.X * rctDiff.X);
rctTmpSrcClip.Width = a_rctSrc.Width + (int)(pntScale.X * rctDiff.Width);
rctTmpSrcClip.Y = a_rctSrc.Y + (int)(pntScale.Y * rctDiff.Y);
rctTmpSrcClip.Height = a_rctSrc.Height + (int)(pntScale.Y * rctDiff.Height);
if (rctTmpSrcClip.X < 0)
{
rctTmpSrcClip.X = 0;
}
a_rctNewSrc = rctTmpSrcClip;
}
public bool IntersectsWith(ERectangleF rct)
{
ERectangleF rctNew = this.Copy();
rctNew.Intersect(rct);
return(!(rctNew.IsNegative || rctNew.IsEmpty));
}