/// <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>
/// 绘制的方法
/// </summary>
/// <param name="e">绘制事件参数</param>
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (paintCanvas) // 绘制绘图板
{
// 获取绘图对象
Graphics g = e.Graphics;
visibleRectangle.Location = ClientRectangle.Location - new Size(AutoScrollPosition);
visibleRectangle.Size = ClientSize;
// 设置绘图参数
g.SmoothingMode = SmoothingMode.HighQuality;
g.PixelOffsetMode = PixelOffsetMode.HighSpeed;
g.TextRenderingHint = TextRenderingHint.ClearTypeGridFit; // 提高文本绘制质量
g.TranslateTransform(this.AutoScrollPosition.X, this.AutoScrollPosition.Y);
// 绘制缩略图元的连接线
if (showAbbreviatGraphElement && autoConnect)
{
abbreviateLine.AbbreviativePaint(g);
}
// 绘制图元
foreach (GraphElement graphElement in graphElementList)
{
Rectangle rectangle = new Rectangle(graphElement.Location, graphElement.ElementSize);
if (graphElement.Visible && (visibleRectangle.Contains(rectangle) || visibleRectangle.IntersectsWith(rectangle))) // 当图元在可视区域内再进行绘制
{
graphElement.Paint(g);
}
}
// 绘制缩略的图元
if (showAbbreviatGraphElement)
{
abbreviatGraphElement.Paint(g);
}
// 绘制多选框
if (multiSelect)
{
g.FillRectangle(multiSelectBrush, multiSelectRectangle);
g.DrawRectangle(multiSelectPen, multiSelectRectangle);
}
// 绘制多选图元框选区域
if (showMultiSelectRegion)
{
g.DrawRectangle(multiSelectRegionPen, multiSelectRegion);
}
// 绘制缩略图控件
if (abbreviateCanvas != null && abbreviateCanvas.Visible)
{
abbreviateCanvas.AbbreciateImage = GetBitMap();
abbreviateCanvas.VisibleRegionLocation = this.AutoScrollPosition;
abbreviateCanvas.VisibleRegionSize = this.ClientSize;
abbreviateCanvas.EntireRegionSize = background.CanvasSize;
abbreviateCanvas.Invalidate();
}
// 绘制冲突区域
if (showConflictRectangle)
{
g.FillRectangle(multiSelectBrush, conflictRectangle);
showConflictRectangle = false;
}
// 绘制提示的图片
if (showTooltipImage)
{
g.DrawImage(tooltipImage, tooltipImageRectangle);
showTooltipImage = false; // 只显示一次
}
// 绘制提示文本
if (background.ShowTooltipText)
{
g.FillRectangle(backgroundBrush, tooltipTextRectangle);
g.DrawRectangle(new Pen(Color.Black), tooltipTextRectangle);
g.DrawString(background.TooltipText, background.TooltipFont, textBrush, tooltipTextLocation);
}
}
}