/// <summary>
/// 刷新缩略图绘图板
/// </summary>
public void RefreshAbbreviateCanvas()
{
if (abbreviateCanvas != null && abbreviateCanvas.Visible && refreshAbbreviateBitmap) // 需要刷新缩略图
{
abbreviateCanvas.PaintCanvas = false; // 避免使用释放的缩略图片资源的问题
AbbreviateCanvas tempAbbreviateCanvas = abbreviateCanvas;
abbreviateCanvas = null;
if (canvasAbbreviateBitmap != null)
{
canvasAbbreviateBitmap.Dispose(); // 释放图片资源
}
canvasAbbreviateBitmap = new Bitmap(background.CanvasSize.Width, background.CanvasSize.Height);
Graphics g = Graphics.FromImage(canvasAbbreviateBitmap);
g.Clear(Color.White);
// 绘制图元
foreach (GraphElement graphElement in graphElementList)
{
graphElement.AbbreviativePaint(g);
}
refreshAbbreviateBitmap = false;
g.Dispose(); // 释放绘图资源
tempAbbreviateCanvas.AbbreciateImage = canvasAbbreviateBitmap;
tempAbbreviateCanvas.Invalidate();
abbreviateCanvas = tempAbbreviateCanvas;
abbreviateCanvas.PaintCanvas = true; // 避免使用释放的缩略图片资源的问题
}
}
/// <summary>
/// 刷新缩略图绘图板
/// </summary>
public void RefreshAbbreviateCanvas()
{
if(abbreviateCanvas != null && abbreviateCanvas.Visible && refreshAbbreviateBitmap) // 需要刷新缩略图
{
abbreviateCanvas.PaintCanvas = false; // 避免使用释放的缩略图片资源的问题
AbbreviateCanvas tempAbbreviateCanvas = abbreviateCanvas;
abbreviateCanvas = null;
if (canvasAbbreviateBitmap != null)
{
canvasAbbreviateBitmap.Dispose(); // 释放图片资源
}
canvasAbbreviateBitmap = new Bitmap(background.CanvasSize.Width, background.CanvasSize.Height);
Graphics g = Graphics.FromImage(canvasAbbreviateBitmap);
g.Clear(Color.White);
// 绘制图元
foreach (GraphElement graphElement in graphElementList)
{
graphElement.AbbreviativePaint(g);
}
refreshAbbreviateBitmap = false;
g.Dispose(); // 释放绘图资源
tempAbbreviateCanvas.AbbreciateImage = canvasAbbreviateBitmap;
tempAbbreviateCanvas.Invalidate();
abbreviateCanvas = tempAbbreviateCanvas;
abbreviateCanvas.PaintCanvas = true; // 避免使用释放的缩略图片资源的问题
}
}