public static void Scale(this ITransformHolder self, double scale, double centerX, double centerY)
{
var d0 = self.TransformPoint(centerX, centerY);
self.ScaleMatrix.ScaleX = scale;
self.ScaleMatrix.ScaleY = scale;
var d1 = self.TransformPoint(centerX, centerY);
var diff = d1 - d0;
self.TranslateMatrix.X += diff.X * scale;
self.TranslateMatrix.Y += diff.Y * scale;
}
public static Point GetTranslateToPosition(this ITransformHolder self)
{
return(new Point(self.TranslateMatrix.X, self.TranslateMatrix.Y));
}
public static void TranslateY(this ITransformHolder self, double offsetY)
{
self.TranslateMatrix.Y += offsetY;
}
public static void TranslateX(this ITransformHolder self, double offsetX)
{
self.TranslateMatrix.X += offsetX;
}
public static void SetTranslate(this ITransformHolder self, double offsetX, double offsetY)
{
self.TranslateMatrix.X = offsetX;
self.TranslateMatrix.Y = offsetY;
}
public static Point TransformPoint(this ITransformHolder self, double x, double y)
{
return(new Point(
(x - self.TranslateMatrix.X) / self.ScaleMatrix.ScaleX,
(y - self.TranslateMatrix.Y) / self.ScaleMatrix.ScaleY));
}