圖類類（三）

//*************************************************************************************************
//完成日期： 2004-11-22
//作者：     何利民
//程序功能： 繪制曲線圖表
//*************************************************************************************************
using System;
using System.Drawing;
using System.Drawing.Text;
using System.Drawing.Imaging;
using System.ComponentModel;

namespace ImagesSpaceName
{

    public class DrawLine : ImageArea
    {
    
        定義類變量#region 定義類變量

        protected int _lineSize=1;                //曲線大小
        protected string _lineColor="#000000";    //曲線顏色

        #endregion

        初使化構造函數#region 初使化構造函數

        public DrawLine()
        {
        }

        #endregion

        定義曲線屬性#region 定義曲線屬性

        /**//// <summary>
        /// 曲線大小
        /// </summary>
        public virtual int LineSize
        {
            get{return _lineSize;}
            set{_lineSize=value;}
        }

        /**//// <summary>
        /// 曲線顏色
        /// </summary>
        public virtual string LineColor
        {
            get{return _lineColor;}
            set{_lineColor=value;}
        }

        #endregion

        繪圖#region 繪圖

        /**//// <summary>
        /// 繪制
        /// </summary>
        /// <param name="arrayX">X軸數據數組</param>
        /// <param name="arrayY">Y軸數據數組</param>
        private void Drawing(string[] arrayX, int[] arrayY)
        {

            if(BgGround==null)
            {
                bitmap = new Bitmap((int)Width,(int)Height);
                graphics = Graphics.FromImage(bitmap);
                graphics.Clear(ColorTranslator.FromHtml(BgColor));
            }
            else
            {
                Bitmap bg;
                try
                {
                    bg = new Bitmap(BgGround);
                    if(BgGroundAlpha<250) bg = ImageAlpha(bg,ColorTranslator.FromHtml(BgColor),BgGroundAlpha);
                }
                catch
                {
                    throw new Exception("背景圖片地址不正確！");
                }
                bitmap = new Bitmap(bg,(int)Width,(int)Height);
                graphics = Graphics.FromImage(bitmap);
            }
            
            SetDrawArea();        //設置繪圖區
            DrawingRuler();        //顯示坐標
            DrawingGrid(arrayY);//繪制網格
            
            int iXlen = arrayX.Length;    //X軸上共有多少段
            int iX = (bottomRightDot.X - bottomLeftDot.X-10)/iXlen;    //X軸上每小段的寬度,其中5表箭頭多出的部份
            int iYlen = arrayY[0];        //Y軸上共有多少段
            for(int i=0; i<arrayY.Length; i++)
            {
                if(iYlen<arrayY[i]) iYlen = arrayY[i];
            }
            int iY = (bottomLeftDot.Y - topLeftDot.Y-10)/iYlen;        //Y軸上每小段的寬度,其中10表箭頭多出的部份
            
            Pen pen = new Pen(new SolidBrush(ColorTranslator.FromHtml(LineColor)),LineSize);
            Font font = new Font(XYFontFamily,XYFontSize);
            for(int i=1; i<iXlen; i++)
            {
                //繪制坐標上的小段及文字
                if(ShowXYTitle)
                {
                    Point x = new Point(bottomLeftDot.X +i*iX,bottomLeftDot.Y);
                    graphics.DrawLine(new Pen(new SolidBrush(ColorTranslator.FromHtml(XYColor)),XYSize),x,new Point(x.X,x.Y+5));    //繪制小段，其中5表小段的長度
                    graphics.DrawString(arrayX[i-1],font,new SolidBrush(ColorTranslator.FromHtml(XYFontColor)),bottomLeftDot.X+(i-1)*iX+iX/4,bottomLeftDot.Y+5);
                    if(i==iXlen-1)
                        graphics.DrawString(arrayX[i],font,new SolidBrush(ColorTranslator.FromHtml(XYFontColor)),bottomLeftDot.X+i*iX+iX/4,bottomLeftDot.Y+5);
                }
                //繪制曲線
                Point pos1 = new Point(bottomLeftDot.X +(i-1)*iX,bottomLeftDot.Y - arrayY[i-1]*iY);
                Point pos2 = new Point(bottomLeftDot.X +i*iX,bottomLeftDot.Y - arrayY[i]*iY);
                graphics.DrawLine(pen,pos1,pos2);
                //是否在當前點顯示文字
                if(ShowPointTitle)
                {
                    graphics.DrawString(arrayY[i-1].ToString(),font,new SolidBrush(Color.Black),pos1);
                    if(i==iXlen-1)
                        graphics.DrawString(arrayY[i].ToString(),font,new SolidBrush(Color.Black),pos2);
                }
            }
            
            if(Alpha<250) bitmap = ImageAlpha(bitmap,ColorTranslator.FromHtml(BgColor),Alpha);
            this.SaveImage(bitmap,ImageFormat.Jpeg);
        }

        #endregion

        外部調用方法#region 外部調用方法
        /**//// <summary>
        /// 繪制曲線圖
        /// </summary>
        /// <param name="arrayX">x坐標值</param>
        /// <param name="arrayY">y坐標值</param>
        public void CreateLine(string[] arrayX, int[] arrayY)
        {
            Drawing(arrayX,arrayY);
        }
        #endregion
    }
}