以下任务/问题:在我的C# WPF项目中有一个称为“MarkPointsMap”的画布，其中有不同类型的标记点(3种...
要将矩形绘制到DrawingContext中,请使用DrawingContext对象的DrawRectangle方法。 类似的方法可用于绘制其他类型的内容。 完成将内容绘制到其中DrawingContext后,调用Close该方法以关闭DrawingContext并保留内容。 在下面的示例中,创建了一个DrawingVisual对象,并在DrawingContext内绘制了一个矩形。
DrawRectangle(Brushes.Black,null,new Rect(MouseDownPoint,new Size(3,30))); base.OnRender(drawingContext); } protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters) { // 让控件接收点击 return new PointHitTestResult(this, hitTestParameters.HitPoint); } protected ...
publicpartialclassTextEditor:FrameworkElement,IIMETextEditor{// 忽略代码protectedoverridevoidOnRender(DrawingContext drawingContext){ drawingContext.DrawRectangle(Brushes.Black,null,newRect(MouseDownPoint,newSize(3,30)));base.OnRender(drawingContext); }protectedoverrideHitTestResultHitTestCore(PointHitTestParameters...
OnRender方法传递了一个单独的DrawingContext类型的参数。这是一个WPF中低级别的绘图API。它提供了一组基础绘图操作,这些都在表7-4中列出。示例7-47使用了DrawRectangle和DrawText方法。 注意到DrawingContext使用了Brush和Pen类来指出形状是如何填充和画轮廓的,正如我们之前看到的高级别形状对象。我们还可以传递同样的Geo...
drawingContext.DrawRectangle(new VisualBrush(mDraggedElement), new Pen(Brushes.Transparent, 0), rect); } } } FrameworkElement mDraggedElement = null; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. ...
Point pt = hitTestParameters.HitPoint;// Perform custom actions during the hit test processing,// which may include verifying that the point actually// falls within the rendered content of the visual.// Return hit on bounding rectangle of visual object.returnnewPointHitTestResult(this, pt); ...
Drag Canvas X position on mouse down event. Please Help! Drag-drop elements within a stack panel Draggable Docking Panels Draw a line using Mouse events Draw horizontal line in a grid row Draw line in canvas Draw path Geometry of vector drawing for arrow Draw Rectangle with red border and ...
="400"BorderBrush="Black"><RectangleFill="Blue"Width="50"Height="50"HorizontalAlignment="Left"><Rectangle.RenderTransform><TranslateTransformx:Name="MyAnimatedTranslateTransform"X="0"Y="0"/></Rectangle.RenderTransform><Rectangle.Triggers><EventTriggerRoutedEvent="Rectangle.MouseLeftButtonDown"><Begin...
drawingContext.DrawRectangle(new VisualBrush(mDraggedElement), new Pen(Brushes.Transparent, 0), rect); } } } FrameworkElement mDraggedElement = null; } 另外一点需要注意的是在ListBox订阅的OnQueryContinueDrag事件中必须不停执行刷新的操作,否则当前的拖拽对象是不能够实时进行更新操作的,这一点非常重要。