public void Render(string title, string subTitle, int width, int height, DataSet chartData, Stream target)
{
const int SIDE_LENGTH = 400;
const int CHART_TOP = 75;
const int CHART_HEIGHT = 200;
const int CHART_LEFT = 50;
const int CHART_WIDTH = 300;
DataTable dt = chartData.Tables[0];
//计算最高的点
float highPoint = 0;
foreach (DataRow dr in dt.Rows)
{
if (highPoint < Convert.ToSingle(dr[1]))
{
highPoint = Convert.ToSingle(dr[1]);
}
}
//建立一个Graphics对象实例
Bitmap bm = new Bitmap(width, height);
Graphics g = Graphics.FromImage(bm);
//设置条图图形和文字属性
g.ScaleTransform((Convert.ToSingle(width)) / SIDE_LENGTH, (Convert.ToSingle(height)) / SIDE_LENGTH);
g.SmoothingMode = SmoothingMode.Default;
g.TextRenderingHint = TextRenderingHint.AntiAlias;
//设定画布和边
g.Clear(Color.White);
g.DrawRectangle(Pens.Black, 0, 0, SIDE_LENGTH - 1, SIDE_LENGTH - 1);
//画大标题
g.DrawString(title, new Font("Tahoma", 24), Brushes.Black, new PointF(5, 5));
//画小标题
g.DrawString(subTitle, new Font("Tahoma", 14), Brushes.Black, new PointF(7, 35));
//画条形图
float barWidth = CHART_WIDTH / (dt.Rows.Count * 2);
PointF barOrigin = new PointF(CHART_LEFT + (barWidth / 2), 0);
float barHeight = dt.Rows.Count;
for (int i = 0; i < dt.Rows.Count; i++)
{
barHeight = Convert.ToSingle(dt.Rows[i][1]) * 200 / highPoint;
barOrigin.Y = CHART_TOP + CHART_HEIGHT - barHeight;
g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)), barOrigin.X, barOrigin.Y, barWidth, barHeight);
barOrigin.X = barOrigin.X + (barWidth * 2);
}
//设置边
g.DrawLine(new Pen(Color.Black, 2), new Point(CHART_LEFT, CHART_TOP), new Point(CHART_LEFT, CHART_TOP + CHART_HEIGHT));
g.DrawLine(new Pen(Color.Black, 2), new Point(CHART_LEFT, CHART_TOP + CHART_HEIGHT), new Point(CHART_LEFT + CHART_WIDTH, CHART_TOP + CHART_HEIGHT));
//画图例框和文字
g.DrawRectangle(new Pen(Color.Black, 1), 200, 300, 199, 99);
g.DrawString("Legend", new Font("Tahoma", 12, FontStyle.Bold), Brushes.Black, new PointF(200, 300));
//画图例
PointF boxOrigin = new PointF(210, 330);
PointF textOrigin = new PointF(235, 326);
for (int i = 0; i < dt.Rows.Count; i++)
{
g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)), boxOrigin.X, boxOrigin.Y, 20, 10);
g.DrawRectangle(Pens.Black, boxOrigin.X, boxOrigin.Y, 20, 10);
g.DrawString(dt.Rows[i][0].ToString() + " - " + dt.Rows[i][1].ToString(), new Font("Tahoma", 10), Brushes.Black, textOrigin);
boxOrigin.Y += 15;
textOrigin.Y += 15;
}
//输出图形
bm.Save(target, ImageFormat.Gif);
//资源回收
bm.Dispose();
g.Dispose();
}
public void Render(string title, string subTitle, int width, int height, DataSet chartData, Stream target)
{
const int SIDE_LENGTH = 400;
const int PIE_DIAMETER = 200;
DataTable dt = chartData.Tables[0];
//通过输入参数，取得饼图中的总基数
float sumData = 0;
foreach (DataRow dr in dt.Rows)
{
sumData += Convert.ToSingle(dr[1]);
}
//产生一个image对象，并由此产生一个Graphics对象
Bitmap bm = new Bitmap(width, height);
Graphics g = Graphics.FromImage(bm);
//设置对象g的属性
g.ScaleTransform((Convert.ToSingle(width)) / SIDE_LENGTH, (Convert.ToSingle(height)) / SIDE_LENGTH);
g.SmoothingMode = SmoothingMode.Default;
g.TextRenderingHint = TextRenderingHint.AntiAlias;
//画布和边的设定
g.Clear(Color.White);
g.DrawRectangle(Pens.Black, 0, 0, SIDE_LENGTH - 1, SIDE_LENGTH - 1);
//画饼图标题
g.DrawString(title, new Font("Tahoma", 24), Brushes.Black, new PointF(5, 5));
//画饼图的图例
g.DrawString(subTitle, new Font("Tahoma", 14), Brushes.Black, new PointF(7, 35));
//画饼图
float curAngle = 0;
float totalAngle = 0;
for (int i = 0; i < dt.Rows.Count; i++)
{
curAngle = Convert.ToSingle(dt.Rows[i][1]) / sumData * 360;
g.FillPie(new SolidBrush(ChartUtil.GetChartItemColor(i)), 100, 65, PIE_DIAMETER, PIE_DIAMETER, totalAngle, curAngle);
g.DrawPie(Pens.Black, 100, 65, PIE_DIAMETER, PIE_DIAMETER, totalAngle, curAngle);
totalAngle += curAngle;
}
//画图例框及其文字
g.DrawRectangle(Pens.Black, 200, 300, 199, 99);
g.DrawString("Legend", new Font("Tahoma", 12, FontStyle.Bold), Brushes.Black, new PointF(200, 300));
//画图例各项
PointF boxOrigin = new PointF(210, 330);
PointF textOrigin = new PointF(235, 326);
float percent = 0;
for (int i = 0; i < dt.Rows.Count; i++)
{
g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)), boxOrigin.X, boxOrigin.Y, 20, 10);
g.DrawRectangle(Pens.Black, boxOrigin.X, boxOrigin.Y, 20, 10);
percent = Convert.ToSingle(dt.Rows[i][1]) / sumData * 100;
g.DrawString(dt.Rows[i][0].ToString() + " - " + dt.Rows[i][1].ToString() + " (" + percent.ToString("0") + "%)", new Font("Tahoma", 10), Brushes.Black, textOrigin);
boxOrigin.Y += 15;
textOrigin.Y += 15;
}
//通过Response.OutputStream，将图形的内容发送到浏览器
bm.Save(target, ImageFormat.Gif);
//回收资源
bm.Dispose();
g.Dispose();
}
