描述

 

用自身的产品和旋转矩阵来更新画笔的当前变换矩阵.

 

C++ Syntax

 

 

FreeBASIC 语法

 

 

参数

 

angle

 

[in]简单精度数指定旋转角度.

 

order

 

该MatrixOrder指定相乘的顺序[in, optional]元.MatrixOrderPrepend指定传递矩阵是在左边,和MatrixOrderAppend指定传递矩阵是正确的.默认值是MatrixOrderPrepend.

 

返回值

 

如果该方法成功,则返回Ok,这是对Status枚举元素.

如果这个方法失败,它返回一个枚举的其他元素的Status.

 

备注

 

一个3？矩阵可以存储任意序列的仿射变换.如果你有几个3？矩阵,其中每一个表示仿射变换,这些矩阵的产品是一个单一的3？表示整个变换序列的矩阵.该产品表示的变换称为复合变换.例如,假设矩阵T代表翻译R代表一个旋转矩阵.如果矩阵M是产品TR,然后矩阵M代表复合变换：先翻译,然后旋转.

 

引用文件

 

CGpBrush.inc (include CGdiPlus.inc)

 

示例

 

' ========================================================================================

' The following example creates a PathGradientBrush object based on a triangular path. The

' calls to the PathGradientBrush.ScaleTransform and PathGradientBrush.RotateTransform methods

' of the PathGradientBrush object set the elements of the brush's transformation matrix so

' that it represents a composite transformation: first scale, then rotate. The code uses

' the path gradient brush twice to paint a rectangle: once before the transformation is set

' and once after the transformation is set.

' ========================================================================================

SUB Example_RotateTransform (BYVAL hdc AS HDC)

 

  ' // Create a graphics object from the window device context

  DIM graphics AS CGpGraphics = hdc

  ' // Get the DPI scaling ratio

  DIM rxRatio AS SINGLE = graphics.GetDpiX / 96

  DIM ryRatio AS SINGLE = graphics.GetDpiY / 96

  ' // Set the scale transform

  graphics.ScaleTransform(rxRatio, ryRatio)

 

  DIM points(0 TO 2) AS GpPoint = {GDIP_POINT(0, 0), GDIP_POINT(50, 0), GDIP_POINT(50, 50)}

  DIM pthGrBrush AS CGpPathGradientBrush = CGpPathGradientBrush(@points(0), 3)

 

  ' // Fill an area with the path gradient brush (no transformation).

  graphics.FillRectangle(@pthGrBrush, 0, 0, 500, 500)

 

  pthGrBrush.ScaleTransform(3.0, 1.0)                   ' // first scale

  pthGrBrush.RotateTransform(60.0, MatrixOrderAppend)   ' // then rotate

 

  ' // Fill the same area with the transformed path gradient brush.

  graphics.FillRectangle(@pthGrBrush, 0, 0, 500, 500)

 

END SUB

' ========================================================================================