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ASP.NET动态创建图象 |
热 ★★★★ |
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ASP.NET动态创建图象 |
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作者：闵涛 文章来源：闵涛的学习笔记 点击数：3253 更新时间：2009/4/23 10:48:39  |
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bsp;= Color.White;
Font myFont = new Font("Arial", 10);
this.DrawChart(g, r, myBackColor, myForeColor, myFont, chartData);
return newBitmap;
}
public void DrawChart(Graphics g, Rectangle r, Color backColor, Color foreColor, Font baseFont, ChartData chartData) {
this.chartData = chartData;
this.g = g;
this.r = r;
this.backColor = backColor;
this.foreColor = foreColor;
this.baseFont = baseFont;
this.legendFont = new Font(baseFont.FontFamily, (baseFont.Size * 2/3), baseFont.Style | FontStyle.Bold);
g.SmoothingMode = SmoothingMode.AntiAlias;
CalculateChartDimensions();
DrawBackground();
InternalDrawChart() ;
}
private void CalculateChartDimensions() {
right = r.Width - 5;
top = 5 * baseFont.Size ;
bottom = r.Height - baseFont.Size * 2;
tickCount = chartData.YMin ;
yCount = (chartData.YMax-chartData.YMin) / chartData.YTickSize ;
hspacing = (bottom-top) / yCount;
vspacing = (right) / chartData.XAxisTitles.Length;
//Left depends on width of text - for simplicities sake assume that largest yvalue is the biggest
//Take into account the first X Axis title
float maxYTextSize = g.MeasureString(chartData.YMax.ToString(), baseFont).Width;
float firstXTitle = g.MeasureString(chartData.XAxisTitles[0], baseFont).Width;
left = (maxYTextSize > firstXTitle) ? maxYTextSize : firstXTitle ;
left = r.X + left + 5 ;
//Calculate size of legend box
float maxLegendWidth = 0 ;
float maxLegendHeight = 0 ;
//Work out size of biggest legend
foreach (ChartLine cl in chartData.Lines) {
float currentWidth = g.MeasureString(cl.Title, legendFont).Width;
float currentHeight = g.MeasureString(cl.Title, legendFont).Height;
maxLegendWidth = (maxLegendWidth > currentWidth) ? maxLegendWidth : currentWidth ;
maxLegendHeight = (maxLegendHeight > currentHeight) ? maxLegendHeight : currentHeight ;
}
legendRect = new RectangleF(r.X+2, r.Y+2, maxLegendWidth + 25 + 5, ((maxLegendHeight+2)*chartData.Lines.Count) + 3) ;
}
private void DrawBackground() {
LinearGradientBrush b = new LinearGradientBrush(r, Color.SteelBlue, backColor,LinearGradientMode.Horizontal);
g.FillRectangle(b, r);
b.Dispose();
}
private void InternalDrawChart() {
DrawGrid() ;
foreach (ChartLine cl in chartData.Lines) {
DrawLine(cl);
}
DrawLegend() ;
//Draw time on chart
string timeString = "Generated:" + DateTime.Now.ToLongTimeString() ;
SizeF textsize = g.MeasureString(timeString,baseFont);
g.DrawString(timeString, baseFont, new SolidBrush(foreColor), r.Width - textsize.Width - 5, textsize.Height * 2 / 3) ;
}
private void DrawGrid() {
Pen gridPen = new Pen(chartData.GridColor) ;
//Vertical - include tick desc''''s
if (chartData.ShowVGridLines) {
for (int i = 0 ; (vspacing * i) < right; i++) {
float x = left + (vspacing *i);
string desc = chartData.XAxisTitles[i];
g.DrawLine(gridPen, x,top,x,bottom +(baseFont.Size*1/3));
SizeF textsize = g.MeasureString(desc,baseFont);
g.DrawString(desc, baseFont, new SolidBrush(chartData.GridColor), x-(textsize.Width/2), bottom + (baseFont.Size*2/3)) ;
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