本文整理汇总了C#中MonoMac.CoreGraphics.CGAffineTransform.Scale方法的典型用法代码示例。如果您正苦于以下问题：C# CGAffineTransform.Scale方法的具体用法？C# CGAffineTransform.Scale怎么用？C# CGAffineTransform.Scale使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类MonoMac.CoreGraphics.CGAffineTransform的用法示例。
在下文中一共展示了CGAffineTransform.Scale方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: DrawImage
/// <summary>
/// Draws the specified portion of the specified Image at the specified location and with the specified size.
///
/// The destPoints specifies a parallelogram with the first point specifying the upper left corner,
/// second point specifying the upper right corner and the third point specifying the lower left corner.
///
/// The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled
/// up or down (in the case where source rectangle overruns the bounds of the image) to fit inside the rectangle
/// specified by the destRect parameter.
/// </summary>
/// <param name="image">Image.</param>
/// <param name="destPoints">Destination points.</param>
/// <param name="srcRect">Source rect.</param>
/// <param name="srcUnit">Source unit.</param>
public void DrawImage(Image image, PointF [] destPoints, RectangleF srcRect, GraphicsUnit srcUnit)
{
if (image == null)
throw new ArgumentNullException ("image");
if (destPoints == null)
throw new ArgumentNullException ("destPoints");
if (destPoints.Length < 3)
throw new ArgumentException ("Destination points must be an array with a length of 3 or 4. " +
"A length of 3 defines a parallelogram with the upper-left, upper-right, " +
"and lower-left corners. A length of 4 defines a quadrilateral with the " +
"fourth element of the array specifying the lower-right coordinate.");
// Windows throws a Not Implemented error if the points are more than 3
if (destPoints.Length > 3)
throw new NotImplementedException ();
var srcRect1 = srcRect;
// If the source units are not the same we need to convert them
// The reason we check for Pixel here is that our graphics already has the Pixel's baked into the model view transform
if (srcUnit != graphicsUnit && srcUnit != GraphicsUnit.Pixel)
{
ConversionHelpers.GraphicsUnitConversion (srcUnit, graphicsUnit, image.HorizontalResolution, image.VerticalResolution, ref srcRect1);
}
// Obtain the subImage
var subImage = image.NativeCGImage.WithImageInRect (srcRect1);
// If we do not have anything to draw then we exit here
if (subImage.Width == 0 || subImage.Height == 0)
return;
// create our rectangle. Offset is 0 because the CreateGeometricTransform bakes our x,y offset in there.
var rect = new RectangleF (0,0, destPoints [1].X - destPoints [0].X, destPoints [2].Y - destPoints [0].Y);
// We need to flip our Y axis so the image appears right side up
var geoTransform = new CGAffineTransform (1, 0, 0, -1, 0, rect.Height);
// Make sure we scale the image in case the source rectangle
// overruns our subimage bounds (width and/or height)
float scaleX = subImage.Width/srcRect1.Width;
float scaleY = subImage.Height/srcRect1.Height;
geoTransform.Scale (scaleX, scaleY);
//var geott = GeomUtilities.CreateGeometricTransform (rect, destPoints);
geoTransform.Multiply (GeomUtilities.CreateGeometricTransform (rect, destPoints));
// Apply our transform to the context
context.ConcatCTM (geoTransform);
// now we draw our image.
context.DrawImage(rect, subImage);
// Now we revert our image transform from the context
var revert = CGAffineTransform.CGAffineTransformInvert (geoTransform);
context.ConcatCTM (revert);
}