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BurnToRect Method

Summary
Burns the annotation objects in Container to the destination context and destination rectangle.
Syntax
C#
VB
Objective-C
C++
Java
public void BurnToRect( 
   LeadRectD destinationRect 
) 
Public Sub BurnToRect( _ 
   ByVal destinationRect As LeadRectD _ 
)  
-(void) burnToRect:(LeadRectD) destinationRect; 
public void burnToRect(LeadRectD destinationRect) 
public:  
   void BurnToRect( 
      LeadRectD^ destinationRect 
   ) 

Parameters

destinationRect
The destination rectangle in container coordinates.

Remarks

All visible objects in this container will be drawn into the current context.

This method uses the resolution (DPI) values stored in the container. Use this method when burning the container objects into the context of the image currently being used in the automation.

To burn a container into a context while specifying new resolution (DPI) values, use BurnToRectWithDpi.

Example

This example will create a container, adds a couple of objects and then burn it to a canvas

C#
using Leadtools.Annotations.Automation; 
using Leadtools.Annotations.Engine; 
using Leadtools.Annotations.Rendering; 
using Leadtools.Codecs; 
using Leadtools.Annotations.WinForms; 
 
public void AnnRenderingEngine_BurnToRect(/*RasterImage image*/) 
{ 
	// Get the container 
	AnnContainer container = _automation.Container; 
	RasterImage image = _viewer.Image; 
 
	double inch = 720.0; 
 
	// Add a red line object, from 1in 1in to 2in 2in 
	AnnPolylineObject lineObj = new AnnPolylineObject(); 
	lineObj.Points.Add(LeadPointD.Create(1 * inch, 1 * inch)); 
	lineObj.Points.Add(LeadPointD.Create(2 * inch, 2 * inch)); 
	lineObj.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("Red"), LeadLengthD.Create(1)); 
	container.Children.Add(lineObj); 
 
	// Add a blue on yellow rectangle from 3in 3in to 4in 4in 
	AnnRectangleObject rectObj = new AnnRectangleObject(); 
	rectObj.Rect = LeadRectD.Create(3 * inch, 3 * inch, 1 * inch, 1 * inch); 
	rectObj.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("Blue"), LeadLengthD.Create(1)); 
	rectObj.Fill = AnnSolidColorBrush.Create("Yellow"); 
	container.Children.Add(rectObj); 
 
	// Get the destination rectangle in container coordinates 
	// The canvas DPI is 96, and the units are 1/720 of an inch 
	// So, sizeInUnits = (sizeInPixels / dpi) = size in inches * 720 = size in container units 
	// Or, we can use the annotations mapper, like this 
	AnnContainerMapper mapper = AnnContainerMapper.CreateDefault(); 
	LeadRectD rc = LeadRectD.Create(0, 0, 200, 200); 
	rc = mapper.RectToContainerCoordinates(rc); 
 
	// Burn the annotations on this image 
 
	IAnnAutomationControl annAutomationControl = _automation.AutomationControl; 
 
	RasterColor[] colors = image.GetPalette(); 
	IntPtr hDC = Leadtools.Drawing.RasterImagePainter.CreateLeadDC(image); 
	if (hDC != null) 
	{ 
		using (Graphics g = Graphics.FromHdc(hDC)) 
		{ 
			// Create a new rendering engine for this container and context 
			AnnWinFormsRenderingEngine renderingEngine = new AnnWinFormsRenderingEngine(container, g); 
 
			// Burn it 
			renderingEngine.BurnToRect(rc); 
		} 
 
		Leadtools.Drawing.RasterImagePainter.DeleteLeadDC(hDC); 
	} 
 
	// Invalidate 
	_automation.Invalidate(LeadRectD.Empty); 
} 
Requirements

Target Platforms

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Leadtools.Annotations.Engine Assembly