如何从canvas控件获取绘图会话(win2d)

问题描述

在win8应用程序中，如何从canvascontrol(win2d)获取绘图会话，或者如何从canvasControl_Draw函数中在canvascontrol上绘制图像.

In a win8 app,how to get a drawingsession from a canvascontrol (win2d),or ,how to draw image on canvascontrol out of the function:canvasControl_Draw.

推荐答案

您不能-这是CanvasControl提供的策略的关键部分.

You cannot - this is a key part of policy provided by CanvasControl.

这可确保:

• 在适当的时间创建并关闭绘图会话

• the drawingsession is created and closed at the appropriate time

绘制

处理设备丢失的错误

如果要强制重绘，可以使用 CanvasControl.Invalidate().

If you want to force a redraw you can use CanvasControl.Invalidate().

或者，您可能会发现要渲染到屏幕外的CanvasRenderTarget(可以调用CreateDrawingSession).然后在CanvasControl_Draw中使用DrawImage将渲染目标绘制到控件上.

Alternatively, you may find that you want to render to an offscreen CanvasRenderTarget (that you can call CreateDrawingSession). Then use DrawImage in your CanvasControl_Draw to draw the render target to the control.

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