最近项目要用C#实现画一个雷达图，搜了搜网上竟然找不到C#画雷达图的解决方案，那么自己实现一个吧
实现效果如下图：
代码如下：
public static class RadarDemo
{
static float mW = 1200;
static float mH = 1200;
static Dictionary<string, float> mData = new Dictionary<string, float>
{
//{ "速度",77},
{ "力量", 72},
{ "防守", 110},
{ "射门", 50},
{ "传球", 80},
{ "耐力", 60 }
};//维度数据
static float mCount = mData.Count; //边数
static float mCenter = mW * 0.5f; //中心点
static float mRadius = mCenter - 100; //半径(减去的值用于给绘制的文本留空间)
static double mAngle = (Math.PI * 2) / mCount; //角度
static Graphics graphics = null;
static int mPointRadius = 5; // 各个维度分值圆点的半径
static int textFontSize = 18; //顶点文字大小 px
const string textFontFamily = "Microsoft Yahei"; //顶点字体
static Color lineColor = Color.Green;
static Color fillColor = Color.FromArgb(128, 255, 0, 0);
static Color fontColor = Color.Black;
public static void Show()
{
Bitmap img = new Bitmap((int)mW, (int)mH);
graphics = Graphics.FromImage(img);
graphics.Clear(Color.White);
img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/0.png", ImageFormat.Png);
DrawPolygon(graphics);
img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/1.png", ImageFormat.Png);
DrawLines(graphics);
img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/2.png", ImageFormat.Png);
DrawText(graphics);
img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/3.png", ImageFormat.Png);
DrawRegion(graphics);
img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/4.png", ImageFormat.Png);
DrawCircle(graphics);
img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/5.png", ImageFormat.Png);
img.Dispose();
graphics.Dispose();
}
// 绘制多边形边
private static void DrawPolygon(Graphics ctx)
{
var r = mRadius / mCount; //单位半径
Pen pen = new Pen(lineColor);
//画6个圈
for (var i = 0; i < mCount; i++)
{
var points = new List<PointF>();
var currR = r * (i + 1); //当前半径
//画6条边
for (var j = 0; j < mCount; j++)
{
var x = (float)(mCenter + currR * Math.Cos(mAngle * j));
var y = (float)(mCenter + currR * Math.Sin(mAngle * j));
points.Add(new PointF { X = x, Y = y });
}
ctx.DrawPolygon(pen, points.ToArray());
//break;
}
ctx.Save();
}
//顶点连线
private static void DrawLines(Graphics ctx)
{
for (var i = 0; i < mCount; i++)
{
var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i));
var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i));
ctx.DrawLine(new Pen(lineColor), new PointF { X = mCenter, Y = mCenter }, new PointF { X = x, Y = y });
//break;
}
ctx.Save();
}
//绘制文本
private static void DrawText(Graphics ctx)
{
var fontSize = textFontSize;//mCenter / 12;
Font font = new Font(textFontFamily, fontSize, FontStyle.Regular);
int i = 0;
foreach (var item in mData)
{
var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i));
var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) - fontSize);
if (mAngle * i > 0 && mAngle * i <= Math.PI / 2)
{
ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width * 0.5f, y + fontSize/* y + fontSize*/);
}
else if (mAngle * i > Math.PI / 2 && mAngle * i <= Math.PI)
{
ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width, y /*y + fontSize*/);
}
else if (mAngle * i > Math.PI && mAngle * i <= Math.PI * 3 / 2)
{
ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width, y);
}
else if (mAngle * i > Math.PI * 3 / 2)
{
ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width * 0.5f, y - fontSize * 0.5f);
}
else
{
ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x, y /* y + fontSize*/);
}
i++;
}
ctx.Save();
}
//绘制数据区域
private static void DrawRegion(Graphics ctx)
{
int i = 0;
List<PointF> points = new List<PointF>();
foreach (var item in mData)
{
var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i) * item.Value / 100);
var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) * item.Value / 100);
points.Add(new PointF { X = x, Y = y });
//ctx.DrawArc(new Pen(lineColor), x, y, r, r, 0, (float)Math.PI * 2);
i++;
}
//GraphicsPath path = new GraphicsPath();
//path.AddLines(points.ToArray());
ctx.FillPolygon(new SolidBrush(fillColor), points.ToArray());
ctx.Save();
}
//画点
private static void DrawCircle(Graphics ctx)
{
//var r = mCenter / 18;
var r = mPointRadius;
int i = 0;
foreach (var item in mData)
{
var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i) * item.Value / 100);
var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) * item.Value / 100);
ctx.FillPie(new SolidBrush(fillColor), x - r, y - r, r * 2, r * 2, 0, 360);
//ctx.DrawArc(new Pen(lineColor), x, y, r, r, 0, (float)Math.PI * 2);
i++;
}
ctx.Save();
}
}
把这个类粘贴到你的项目中，执行RadarDemo.Show();就会在你的根目录里生成雷达图了，为了方便理解怎么画出来的，我把画每一个步骤时的图片都保存下来了。可以自行运行查看
以上所述是小编给大家介绍的C# 使用GDI绘制雷达图的实例，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
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