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C#绘制曲线图和柱状图
在我们程序开发的过程中经常会需要绘制曲线图和柱状图等，尤其是在做统计功能时。但是有时候我们有觉得没有必要使用第三方控件（例如：ZedGraph等），这是我们可以自己编写代码来实现这些图形绘制的功能。以下是我在开发过程中所使用过的两段代码，现共享大家，希望能给大家带来一定的帮助，如有不妥敬请斧正！
1.柱状图，效果图如下
代码如下：
注意：请注意参数 chartTable 图形里的一些元素需要从chartTable里面取。具体请查看代码。
//Render是图形大标题，图开小标题，图形宽度，图形长度，饼图的数据集和饼图的数据集
publicImageRender(stringtitle,intwidth,intheight,DataTablechartTable)
{
Bitmapbm=newBitmap(width,height);
Graphicsg=Graphics.FromImage(bm);
g.Clear(Color.White);
DataTabledt=chartTable;
constinttop=30;
constintleft=35;
if(width<left*2||height<top*2)
{
g.DrawString("绘图区域太小",newFont("Tahoma",8),
Brushes.Blue,newPointF(0,0));
returnbm;
}
//计算最高的点
floathighPoint=1;
foreach(DataRowdrindt.Rows)
{
if(highPoint<Convert.ToSingle(dr[0]))
{
highPoint=Convert.ToSingle(dr[0]);
}
if(highPoint<Convert.ToSingle(dr[1]))
{
highPoint=Convert.ToSingle(dr[1]);
}
}
try
{
//画大标题
g.DrawString(title,newFont("Tahoma",12),Brushes.Black,newPointF(2,2));
StringFormatdrawFormat=newStringFormat();
drawFormat.FormatFlags=StringFormatFlags.DirectionVertical;
g.DrawString("[红--"+dt.Columns[0].ToString()+"]",newFont("Tahoma",8),
Brushes.Red,newPointF(2,top),drawFormat);
g.DrawString("[蓝--"+dt.Columns[1].ToString()+"]",newFont("Tahoma",8),
Brushes.Blue,newPointF(17,top),drawFormat);
//画条形图
floatbarWidth=(Convert.ToSingle(width)-left)/(dt.Rows.Count*3+1);
PointFbarOrigin=newPointF(left+barWidth,0);
floatbarHeight=dt.Rows.Count;
floattopFontSize=(barWidth/highPoint.ToString().Length);
if(topFontSize>2*top/3)
{
topFontSize=2*top/3;
}
if(topFontSize<5)
{
topFontSize=5;
}
for(inti=0;i<dt.Rows.Count;i++)
{
//底部字体的大小
floatbottomFontSize=(2*barWidth/dt.Rows[i][2].ToString().Length)+2;
if(bottomFontSize>2*top/3)
{
bottomFontSize=2*top/3;
}
barHeight=Convert.ToSingle(dt.Rows[i][0])*(height-2*top)/highPoint*1;
barOrigin.Y=height-barHeight-top;
g.FillRectangle(newSolidBrush(Color.Red),barOrigin.X,barOrigin.Y,barWidth,barHeight);
//柱状图底部
g.DrawString(dt.Rows[i][2].ToString(),newFont("Tahoma",bottomFontSize),Brushes.Black,
newPointF(barOrigin.X,height-top));
//柱状图顶部
g.DrawString(dt.Rows[i][0].ToString(),newFont("Tahoma",topFontSize),Brushes.Red,
newPointF(barOrigin.X,barOrigin.Y-3*topFontSize/2));
barOrigin.X=barOrigin.X+barWidth;
barHeight=Convert.ToSingle(dt.Rows[i][1])*(height-2*top)/highPoint*1;
barOrigin.Y=height-barHeight-top;
g.FillRectangle(newSolidBrush(Color.Blue),barOrigin.X,barOrigin.Y,barWidth,
barHeight);
//柱状图顶部
g.DrawString(dt.Rows[i][1].ToString(),newFont("Tahoma",topFontSize),Brushes.Blue,
newPointF(barOrigin.X,barOrigin.Y-3*topFontSize/2));
barOrigin.X=barOrigin.X+(barWidth*2);
}
//设置边
g.DrawLine(newPen(Color.Blue,2),newPoint(left,top),
newPoint(left,height-top));
g.DrawLine(newPen(Color.Blue,2),newPoint(left,height-top),
newPoint(left+width,height-top));
g.Dispose();
returnbm;
}
catch
{
returnbm;
}
}
2.线状图，效果如下：
代码如下：
注意：请注意参数 chartTable 图形里的一些元素需要从chartTable里面取。具体请查看代码。
//Render是图形大标题，图开小标题，图形宽度，图形长度，饼图的数据集和饼图的数据集
publicImageRender(stringtitle,intwidth,intheight,DataTablechartTable)
{
Bitmapbm=newBitmap(width,height);
Graphicsg=Graphics.FromImage(bm);
g.Clear(Color.White);
constinttop=30;
constintleft=35;
if(width<left*2||height<top*2)
{
g.DrawString("绘图区域太小",newFont("Tahoma",8),
Brushes.Blue,newPointF(0,0));
returnbm;
}
if(chartTable==null)
{
g.DrawString("没有数据",newFont("Tahoma",7),
Brushes.Blue,newPointF(0,0));
returnbm;
}
DataTabledt=chartTable;
//计算最高的点
floathighPoint=1;
foreach(DataRowdrindt.Rows)
{
if(highPoint<Convert.ToSingle(dr[0]))
{
highPoint=Convert.ToSingle(dr[0]);
}
if(highPoint<Convert.ToSingle(dr[1]))
{
highPoint=Convert.ToSingle(dr[1]);
}
}
//建立一个Graphics对象实例
try
{
//画大标题
g.DrawString(title,newFont("Tahoma",12),Brushes.Black,newPointF(2,2));
StringFormatdrawFormat=newStringFormat();
drawFormat.FormatFlags=StringFormatFlags.DirectionVertical;
g.DrawString("[红--"+dt.Columns[0].ToString()+"]",newFont("Tahoma",8),
Brushes.Red,newPointF(2,top),drawFormat);
g.DrawString("[蓝--"+dt.Columns[1].ToString()+"]",newFont("Tahoma",8),
Brushes.Blue,newPointF(17,top),drawFormat);
//画条形图
floatbarWidth=(Convert.ToSingle(width)-left)/(dt.Rows.Count+1);
PointFbarOrigin=newPointF(left+barWidth,0);
floatbarHeight=dt.Rows.Count;
floattopFontSize=7;
floatbottomFontSize=7;
PointF[]pt1=newPointF[dt.Rows.Count];
PointF[]pt2=newPointF[dt.Rows.Count];
for(inti=0;i<dt.Rows.Count;i++)
{
//底部字体的大小
barHeight=Convert.ToSingle(dt.Rows[i][0])*(height-2*top)/highPoint*1;
barOrigin.Y=height-barHeight-top;
g.FillEllipse(newSolidBrush(Color.Red),barOrigin.X-3,barOrigin.Y-3,6,6);
pt1[i]=newPointF(barOrigin.X,barOrigin.Y);
//顶部
g.DrawString(dt.Rows[i][0].ToString(),newFont("Tahoma",topFontSize),Brushes.Red,
newPointF(barOrigin.X,barOrigin.Y-4*topFontSize/2));
barHeight=Convert.ToSingle(dt.Rows[i][1])*(height-2*top)/highPoint*1;
barOrigin.Y=height-barHeight-top;
g.FillEllipse(newSolidBrush(Color.Blue),barOrigin.X-3,barOrigin.Y-3,6,6);
pt2[i]=newPointF(barOrigin.X,barOrigin.Y);
//顶部
g.DrawString(dt.Rows[i][1].ToString(),newFont("Tahoma",topFontSize),Brushes.Blue,
newPointF(barOrigin.X,barOrigin.Y-4*topFontSize/2));
barOrigin.X=barOrigin.X+barWidth;
}
if(dt.Rows.Count>10)
{
intdis=dt.Rows.Count/10;
for(inti=0;i<dt.Rows.Count;i++)
{
if(i%dis==0)
{
g.DrawLine(newPen(Color.Blue,2),newPointF(left+(i+1)*barWidth,height-
top+5),
newPointF(left+(i+1)*barWidth,height-top-3));
//底部
g.DrawString(dt.Rows[i][2].ToString(),newFont("Tahoma",bottomFontSize),
Brushes.Black,
newPointF(left+(i+1)*barWidth,height-top));
}
else
{
g.DrawLine(newPen(Color.Gray,1),newPointF(left+(i+1)*barWidth,height-
top+3),
newPointF(left+(i+1)*barWidth,height-top-3));
}
}
}
else
{
for(inti=0;i<dt.Rows.Count;i++)
{
g.DrawLine(newPen(Color.Gray,1),newPointF(left+(i+1)*barWidth,height-top
+3),
newPointF(left+(i+1)*barWidth,height-top-3));
}
}
//绘制曲线
g.DrawLines(newPen(newSolidBrush(Color.Red),1),pt1);
g.DrawLines(newPen(newSolidBrush(Color.Blue),1),pt2);
//设置边
g.DrawLine(newPen(Color.Blue,2),newPoint(left,top),
newPoint(left,height-top));
g.DrawLine(newPen(Color.Blue,2),newPoint(left,height-top),
newPoint(left+width,height-top));
g.Dispose();
returnbm;
}
catch
{
returnbm;
}
}
补充一句：转载的朋友请一定注明出处谢谢！半支烟阿杰
http://blog.csdn.net/gisfarmer/
2.线状图，效果如下：
代码如下：
注意：请注意参数 chartTable 图形里的一些元素需要从chartTable里面取。具体请查看代码。
//Render是图形大标题，图开小标题，图形宽度，图形长度，饼图的数据集和饼图的数据集
publicImageRender(stringtitle,intwidth,intheight,DataTablechartTable)
{
Bitmapbm=newBitmap(width,height);
Graphicsg=Graphics.FromImage(bm);
g.Clear(Color.White);
constinttop=30;
constintleft=35;
if(width<left*2||height<top*2)
{
g.DrawString("绘图区域太小",newFont("Tahoma",8),
Brushes.Blue,newPointF(0,0));
returnbm;
}
if(chartTable==null)
{
g.DrawString("没有数据",newFont("Tahoma",7),
Brushes.Blue,newPointF(0,0));
returnbm;
}
DataTabledt=chartTable;
//计算最高的点
floathighPoint=1;
foreach(DataRowdrindt.Rows)
{
if(highPoint<Convert.ToSingle(dr[0]))
{
highPoint=Convert.ToSingle(dr[0]);
}
if(highPoint<Convert.ToSingle(dr[1]))
{
highPoint=Convert.ToSingle(dr[1]);
}
}
//建立一个Graphics对象实例
try
{
//画大标题
g.DrawString(title,newFont("Tahoma",12),Brushes.Black,newPointF(2,2));
StringFormatdrawFormat=newStringFormat();
drawFormat.FormatFlags=StringFormatFlags.DirectionVertical;
g.DrawString("[红--"+dt.Columns[0].ToString()+"]",newFont("Tahoma",8),
Brushes.Red,newPointF(2,top),drawFormat);
g.DrawString("[蓝--"+dt.Columns[1].ToString()+"]",newFont("Tahoma",8),
Brushes.Blue,newPointF(17,top),drawFormat);
//画条形图
floatbarWidth=(Convert.ToSingle(width)-left)/(dt.Rows.Count+1);
PointFbarOrigin=newPointF(left+barWidth,0);
floatbarHeight=dt.Rows.Count;
floattopFontSize=7;
floatbottomFontSize=7;
PointF[]pt1=newPointF[dt.Rows.Count];
PointF[]pt2=newPointF[dt.Rows.Count];
for(inti=0;i<dt.Rows.Count;i++)
{
//底部字体的大小
barHeight=Convert.ToSingle(dt.Rows[i][0])*(height-2*top)/highPoint*1;
barOrigin.Y=height-barHeight-top;
g.FillEllipse(newSolidBrush(Color.Red),barOrigin.X-3,barOrigin.Y-3,6,6);
pt1[i]=newPointF(barOrigin.X,barOrigin.Y);
//顶部
g.DrawString(dt.Rows[i][0].ToString(),newFont("Tahoma",topFontSize),Brushes.Red,
newPointF(barOrigin.X,barOrigin.Y-4*topFontSize/2));
barHeight=Convert.ToSingle(dt.Rows[i][1])*(height-2*top)/highPoint*1;
barOrigin.Y=height-barHeight-top;
g.FillEllipse(newSolidBrush(Color.Blue),barOrigin.X-3,barOrigin.Y-3,6,6);
pt2[i]=newPointF(barOrigin.X,barOrigin.Y);
//顶部
g.DrawString(dt.Rows[i][1].ToString(),newFont("Tahoma",topFontSize),Brushes.Blue,
newPointF(barOrigin.X,barOrigin.Y-4*topFontSize/2));
barOrigin.X=barOrigin.X+barWidth;
}
if(dt.Rows.Count>10)
{
intdis=dt.Rows.Count/10;
for(inti=0;i<dt.Rows.Count;i++)
{
if(i%dis==0)
{
g.DrawLine(newPen(Color.Blue,2),newPointF(left+(i+1)*barWidth,height-
top+5),
newPointF(left+(i+1)*barWidth,height-top-3));
//底部
g.DrawString(dt.Rows[i][2].ToString(),newFont("Tahoma",bottomFontSize),
Brushes.Black,
newPointF(left+(i+1)*barWidth,height-top));
}
else
{
g.DrawLine(newPen(Color.Gray,1),newPointF(left+(i+1)*barWidth,height-
top+3),
newPointF(left+(i+1)*barWidth,height-top-3));
}
}
}
else
{
for(inti=0;i<dt.Rows.Count;i++)
{
g.DrawLine(newPen(Color.Gray,1),newPointF(left+(i+1)*barWidth,height-top
+3),
newPointF(left+(i+1)*barWidth,height-top-3));
}
}
//绘制曲线
g.DrawLines(newPen(newSolidBrush(Color.Red),1),pt1);
g.DrawLines(newPen(newSolidBrush(Color.Blue),1),pt2);
//设置边
g.DrawLine(newPen(Color.Blue,2),newPoint(left,top),
newPoint(left,height-top));
g.DrawLine(newPen(Color.Blue,2),newPoint(left,height-top),
newPoint(left+width,height-top));
g.Dispose();
returnbm;
}
catch
{
returnbm;
}
}
补充一句：转载的朋友请一定注明出处谢谢！半支烟阿杰
http://blog.csdn.net/gisfarmer/
