操作說明:轉換筆刷
此範例示範如何使用其兩個轉換屬性來轉換 Brush 物件:RelativeTransform 和 Transform。
下列範例使用 RotateTransform 來將 ImageBrush 的內容旋轉 45 度。
下圖顯示沒有 RotateTransform 的 ImageBrush,以及套用至 RelativeTransform 屬性的 RotateTransform,以及套用至 Transform 屬性的 RotateTransform。
筆刷的 RelativeTransform 和 Transform 設定wcpsdk_graphicsmm_transformandrelativetransform
範例
第一個範例會將 RotateTransform 套用至 ImageBrush 的 RelativeTransform 屬性。 RotateTransform 物件的 CenterX 和 CenterY 屬性都設定為 0.5,這是此內容中心點的相對座標。 因此,ImageBrush 內容會圍繞其中心旋轉。
//
// Create an ImageBrush with a relative transform and
// use it to paint a rectangle.
//
ImageBrush relativeTransformImageBrush = new ImageBrush();
relativeTransformImageBrush.ImageSource =
new BitmapImage(new Uri(@"sampleImages\pinkcherries.jpg", UriKind.Relative));
// Create a 45 rotate transform about the brush's center
// and apply it to the brush's RelativeTransform property.
RotateTransform aRotateTransform = new RotateTransform();
aRotateTransform.CenterX = 0.5;
aRotateTransform.CenterY = 0.5;
aRotateTransform.Angle = 45;
relativeTransformImageBrush.RelativeTransform = aRotateTransform;
// Use the brush to paint a rectangle.
Rectangle relativeTransformImageBrushRectangle = new Rectangle();
relativeTransformImageBrushRectangle.Width = 175;
relativeTransformImageBrushRectangle.Height = 90;
relativeTransformImageBrushRectangle.Stroke = Brushes.Black;
relativeTransformImageBrushRectangle.Fill = relativeTransformImageBrush;
'
' Create an ImageBrush with a relative transform and
' use it to paint a rectangle.
'
Dim relativeTransformImageBrush As New ImageBrush()
relativeTransformImageBrush.ImageSource = New BitmapImage(New Uri("sampleImages\pinkcherries.jpg", UriKind.Relative))
' Create a 45 rotate transform about the brush's center
' and apply it to the brush's RelativeTransform property.
Dim aRotateTransform As New RotateTransform()
aRotateTransform.CenterX = 0.5
aRotateTransform.CenterY = 0.5
aRotateTransform.Angle = 45
relativeTransformImageBrush.RelativeTransform = aRotateTransform
' Use the brush to paint a rectangle.
Dim relativeTransformImageBrushRectangle As New Rectangle()
relativeTransformImageBrushRectangle.Width = 175
relativeTransformImageBrushRectangle.Height = 90
relativeTransformImageBrushRectangle.Stroke = Brushes.Black
relativeTransformImageBrushRectangle.Fill = relativeTransformImageBrush
<Rectangle Width="175" Height="90" Stroke="Black">
<Rectangle.Fill>
<ImageBrush ImageSource="sampleImages\pinkcherries.jpg">
<ImageBrush.RelativeTransform>
<RotateTransform CenterX="0.5" CenterY="0.5" Angle="45" />
</ImageBrush.RelativeTransform>
</ImageBrush>
</Rectangle.Fill>
</Rectangle>
第二個範例也會將 RotateTransform 套用至 ImageBrush;不過,這個範例會使用 Transform 屬性,而不是 RelativeTransform 屬性。
為了圍繞其中心旋轉筆刷,本範例會將 RotateTransform 物件的 CenterX 和 CenterY 屬性設為絕對座標。 由於筆刷會繪製大小為 175 x 90 像素的矩形,矩形的中心點將會是 (87.5, 45)。
//
// Create an ImageBrush with a transform and
// use it to paint a rectangle.
//
ImageBrush transformImageBrush = new ImageBrush();
transformImageBrush.ImageSource =
new BitmapImage(new Uri(@"sampleImages\pinkcherries.jpg", UriKind.Relative));
// Create a 45 rotate transform about the brush's center
// and apply it to the brush's Transform property.
RotateTransform anotherRotateTransform = new RotateTransform();
anotherRotateTransform.CenterX = 87.5;
anotherRotateTransform.CenterY = 45;
anotherRotateTransform.Angle = 45;
transformImageBrush.Transform = anotherRotateTransform;
// Use the brush to paint a rectangle.
Rectangle transformImageBrushRectangle = new Rectangle();
transformImageBrushRectangle.Width = 175;
transformImageBrushRectangle.Height = 90;
transformImageBrushRectangle.Stroke = Brushes.Black;
transformImageBrushRectangle.Fill = transformImageBrush;
'
' Create an ImageBrush with a transform and
' use it to paint a rectangle.
'
Dim transformImageBrush As New ImageBrush()
transformImageBrush.ImageSource = New BitmapImage(New Uri("sampleImages\pinkcherries.jpg", UriKind.Relative))
' Create a 45 rotate transform about the brush's center
' and apply it to the brush's Transform property.
Dim anotherRotateTransform As New RotateTransform()
anotherRotateTransform.CenterX = 87.5
anotherRotateTransform.CenterY = 45
anotherRotateTransform.Angle = 45
transformImageBrush.Transform = anotherRotateTransform
' Use the brush to paint a rectangle.
Dim transformImageBrushRectangle As New Rectangle()
transformImageBrushRectangle.Width = 175
transformImageBrushRectangle.Height = 90
transformImageBrushRectangle.Stroke = Brushes.Black
transformImageBrushRectangle.Fill = transformImageBrush
<Rectangle Width="175" Height="90" Stroke="Black">
<Rectangle.Fill>
<ImageBrush ImageSource="sampleImages\pinkcherries.jpg">
<ImageBrush.Transform>
<RotateTransform CenterX="87.5" CenterY="45" Angle="45" />
</ImageBrush.Transform>
</ImageBrush>
</Rectangle.Fill>
</Rectangle>
如需 RelativeTransform 和 Transform 屬性運作方式的描述,請參閱筆刷轉換概觀。
如需完整的範例,請參閱筆刷範例。 如需筆刷的詳細資訊,請參閱使用純色和漸層繪製的概觀。