求助 画了个饼状图，但显示的比例有问题
今天做了个饼状图控件，我用6个相同的数据测试，计算的结果是各占16.667%，六分之一，这是正确的，但是在图上显示的却不大小不一，为什么？本人是新手，第一次发帖，不知道怎么发图片。。。。。。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using Microsoft.JScript;
namespace kongjianlx
{
public partial class tjzhu :UserControl
{
private MapTypes mapType; //图表类型
private int xuan = 1;
private float beiy = 10;
private float beix = 1;
private string biaoti = "要输入的标题";
private int biaotizihao=10;
private int biaotizigao = 12;
private int gsx = 13;
private int gsy = 11;
private Point jiao = new Point(6, 5);
private int zihao = 10;
private string dany = "Y轴单位";
private string danx = "X轴单位";
private float[] zhi=new float [] {80,90};
private string[] zhimiaoshu = new string[] { "产量A", "产量B", "产量c", "产量d", "产量e", "产量f", "产量g", "产量h", "产量i", "产量j", "产量k", "产量l", "产量m" };
private void tjzhu_Paint(object sender, PaintEventArgs e)
{
int i;
if (mapType == MapTypes.折线图)
{
jiao.X = 0;
jiao.Y = 0;
}
float[] zhi = new float[] { 60,60,60,60,60,60};// 测试数据，图的分档等于数据的个数
Graphics g = e.Graphics;
Bitmap bmap = new Bitmap(this.Size.Width, this.Size.Height); /////定义图像大小；
Graphics gph = Graphics.FromImage(bmap); ////定义或创建gdi绘图对像；
gph.Clear(Color.White);//Yellow);//////////////////1111
System.Drawing.Pen myPen = new System.Drawing.Pen(System.Drawing.Color.FromArgb(80, 80, 80, 80));
if (mapType == MapTypes.饼状图)
{
int x = bmap.Width/10;
int y = bmap.Height/10;
int a = bmap.Width / 5 * 3;
int b = bmap.Height / 5 * 3;
Point yd = new Point(a / 2 + x, b / 2 + y);
Rectangle tempRect = new Rectangle(x, y, a, b);
Rectangle tempRect1 = new Rectangle(x, y+jiao.Y, a, b);
// gph.DrawEllipse(Pens.Black,tempRect);
// gph.DrawRectangle(Pens.Black,x, y, a, b);
float sum = 0;
float jiaodu = 0;
float tempFloat = 0;
float bl = 0;
for (i = 0; i < zhi.Length; i++)
{
sum += zhi[i];
}
/* for (i = 0; i < zhi.Length; i++)
{
jiaodu = zhi[i] / sum * 360;
Color myColor = GetColor(i);
Brush myBrush = new SolidBrush(myColor);
if (i == zhi.Length - 1)
{
gph.FillPie(myBrush, tempRect1, tempFloat, 360 - tempFloat);
gph.DrawPie(Pens.Black, tempRect1, tempFloat, 360 - tempFloat);
// gph.FillPie(myBrush, tempRect, tempFloat, 360 - tempFloat);
// gph.DrawPie(Pens.Black, tempRect, tempFloat, 360 - tempFloat);
}
else
{
gph.FillPie(myBrush, tempRect1, tempFloat, jiaodu);
gph.DrawPie(Pens.Black, tempRect1, tempFloat, jiaodu);
// gph.FillPie(myBrush, tempRect, tempFloat, jiaodu);
// gph.DrawPie(Pens.Black, tempRect, tempFloat, jiaodu);
tempFloat += jiaodu;
}
}
tempFloat = 0;*/
for (i = 0; i < zhi.Length; i++)
{
jiaodu = zhi[i] / sum * 360;
Color myColor = GetColor(i);
Brush myBrush = new SolidBrush(myColor);
/* if (i == zhi.Length - 1)
{
gph.FillPie(myBrush, tempRect, tempFloat, 360 - tempFloat);
// gph.DrawPie(Pens.Black, tempRect, tempFloat, 360 - tempFloat);
float x1 = a / 2 * (float)MathObject.cos(tempFloat * Math.PI / 180) + yd.X;
float y1 = b / 2 * (float)MathObject.sin(tempFloat * Math.PI / 180) + yd.Y;
gph.DrawLine(Pens.Black, yd.X, yd.Y, x1, y1);
}
else*/
{
gph.FillPie(myBrush, tempRect, tempFloat, jiaodu);
// gph.DrawPie(Pens.Black, tempRect, tempFloat, jiaodu);
// float x1 = a / 2 * (float)MathObject.cos(tempFloat * Math.PI / 180) + yd.X;
// float y1 = b / 2 * (float)MathObject.sin(tempFloat * Math.PI / 180) + yd.Y;
// gph.DrawLine(Pens.Black, yd.X, yd.Y, x1, y1);
tempFloat += jiaodu;
}
gph.FillRectangle(myBrush, bmap.Width / 4 * 3, bmap.Height / 10 + i * zihao * 2, zihao, zihao);
gph.DrawRectangle(Pens.Black, bmap.Width / 4 * 3, bmap.Height / 10 + i * zihao * 2, zihao, zihao);
Rectangle rect = new Rectangle(bmap.Width / 4 * 3 + zihao * 2, bmap.Height / 10 + i * zihao * 2, bmap.Width / 5, zihao * 2);
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
gph.DrawString((100*jiaodu/360).ToString()+"%", new Font("宋体", zihao), Brushes.Black, rect, sf);
// */
}
}
g.DrawImage(bmap,0,0);
}
--------------------编程问答-------------------- public enum MapTypes
{
饼状图,
折线图,
柱状图
}
public int Xuan
{
get
{
return xuan;
}
set
{
xuan = value;
Invalidate();
}
}
public float Beiy
{
get
{
return beiy;
}
set
{
beiy = value;
Invalidate();
}
}
public float Beix
{
get
{
return beix;
}
set
{
beix = value;
Invalidate();
}
}
public string Biaoti
{
get
{
return biaoti;
}
set
{
biaoti = value;
Invalidate();
}
}
public int Biaotizihao
{
get
{
return biaotizihao;
}
set
{
biaotizihao = value;
Invalidate();
}
}
public int Biaotizigao
{
get
{
return biaotizigao;
}
set
{
biaotizigao = value;
Invalidate();
}
}
public int Gsx
{
get
{
return gsx;
}
set
{
gsx = value;
Invalidate();
}
}
public int Gsy
{
get
{
return gsy;
}
set
{
gsy = value;
Invalidate();
}
}
public Point Jiao
{
get
{
return jiao;
}
set
{
jiao = value;
Invalidate();
}
}
public int Zihao
{
get
{
return zihao;
}
set
{
zihao = value;
Invalidate();
}
}
// [DefaultValue("要输入的标题")]
public float[] Zhi
{
get
{
return zhi;
}
set
{
zhi = value;
Invalidate();
}
}
public string[] Zhimiaoshu
{
get
{
return zhimiaoshu;
}
set
{
zhimiaoshu = value;
Invalidate();
}
}
//*/
// [DefaultValue("要输入的标题")]
public string Dany
{
get
{
return dany;
}
set
{
dany = value;
Invalidate();
}
}
public string Danx
{
get
{
return danx;
}
set
{
danx = value;
Invalidate();
}
}
public MapTypes MapType
{
get
{
return mapType;
}
set
{
mapType = value;
}
}
public tjzhu()
{
InitializeComponent();
// this.shezhi();
}
private Color GetColor(int ValueIndex)
{
Color ColorTemp;
switch (ValueIndex)
{
case 0: //红色
ColorTemp = Color.FromArgb(235, 0, 0);
break;
case 1:
ColorTemp = Color.FromArgb(142, 235, 235);
break;
case 2:
ColorTemp = Color.FromArgb(0, 192, 192);
break;
case 3:
ColorTemp = Color.FromArgb(235, 216, 177);
break;
case 4:
ColorTemp = Color.FromArgb(189, 167, 225);
break;
case 5:
ColorTemp = Color.FromArgb(0xff, 0xe4, 0xe1);
break;
case 6:
ColorTemp = Color.FromArgb(0x00, 0x00, 0xff);
break;
case 7:
ColorTemp = Color.FromArgb(0x80, 0x80, 0x00);
break;
case 8:
ColorTemp = Color.FromArgb(0x48, 0xd1, 0xcc);
break;
case 9:
ColorTemp = Color.FromArgb(0xbc, 0x8f, 0x8f);
break;
case 10:
ColorTemp = Color.FromArgb(0xad, 0xd8, 0xe6);
break;
case 11:
ColorTemp = Color.FromArgb(0x94, 0x00, 0xd3);
break;
case 12:
ColorTemp = Color.FromArgb(0x00, 0x8b, 0x8b);
break;
case 13:
ColorTemp = Color.FromArgb(0xaf, 0xee, 0xee);
break;
case 14:
ColorTemp = Color.FromArgb(0x7b, 0x68, 0xee);
break;
case 15:
ColorTemp = Color.FromArgb(0xf0, 0xf8, 0xff);
break;
case 16:
ColorTemp = Color.FromArgb(0xb8, 0x86, 0x0b);
break;
case 17:
ColorTemp = Color.FromArgb(0xff, 0xd7, 0x00);
break;
case 18:
ColorTemp = Color.FromArgb(0x32, 0xcd, 0x32);
break;
case 19:
ColorTemp = Color.FromArgb(0x00, 0xfa, 0x9a);
break;
default:
ColorTemp = Color.Black;
break;
}
return ColorTemp;
}
}
}
我还用30，60等角度试过，比例都不准，不知道为什么，希望高手帮下，谢谢
--------------------编程问答-------------------- 大部分情况下是由于小数点引起的误差造成的.尝试修改一下计算公式里的函数 --------------------编程问答-------------------- 同样的数据相差接近1倍，不是小数的问题 --------------------编程问答-------------------- 有做了个实验，图越接近圆形比例就越准，越扁就越失真，有什么方法可以矫正吗？希望高手指点下，本人新手，万分感谢！！！！！！！！！ --------------------编程问答-------------------- 画的时候按正圆画,然后再建一个宽度相同但高度只有一半差不多的图,把结果图画上去,就变形了.但还是那句话:小数点影响比例,长期以来我也是对此比较头痛的.
以下是我以前做的,两张图中都有明显的因小数点引起的偏差扩大.
--------------------编程问答--------------------
相同的数据，差的太多了 --------------------编程问答-------------------- 百分比是一样的，中间的两个也太小了
看了你编的图片，我都自卑了，打击我信心啊！ --------------------编程问答-------------------- 呵,有什么打击不打击的.我偏向于喜欢去创作人机界面,不擅长做数据.相信自己,我期待你成功.
补充：.NET技术 , C#
