/// <summary>
/// PictureBox (pb) 上の座標から、pb.Image 上の座標に変換する。
/// pb.SizeMode == PictureBoxSizeMode.Zoom であること。
/// </summary>
/// <param name="pb"></param>
/// <param name="pbPt"></param>
/// <param name="toRangeFlag"></param>
/// <returns>null == 枠外 || 画像が設定されていない。</returns>
public static XYPoint getPictureBoxPointToImagePoint(PictureBox pb, XYPoint pbPt, bool toRangeFlag = false)
{
Image img = pb.Image;
if (img == null)
{
return(null);
}
double w = (double)img.Width;
double h = (double)img.Height;
double screen_w = (double)pb.Width;
double screen_h = (double)pb.Height;
Rect imgRect = new Rect(w, h);
Rect screenRect = new Rect(0, 0, screen_w, screen_h);
imgRect.adjustInside(screenRect);
double x = pbPt.x;
double y = pbPt.y;
x -= imgRect.l;
y -= imgRect.t;
x /= imgRect.w;
y /= imgRect.h;
if (toRangeFlag)
{
x = DoubleTools.toRange(x, 0.0, 1.0);
y = DoubleTools.toRange(y, 0.0, 1.0);
}
else
{
if (DoubleTools.isRange(x, 0.0, 1.0) == false)
{
return(null);
}
if (DoubleTools.isRange(y, 0.0, 1.0) == false)
{
return(null);
}
}
x *= img.Width;
y *= img.Height;
return(new XYPoint(x, y));
}