C # Drawing (can handle negative values)

Using System;
Using system.io;//for file access
Using system.data;//for data access
Using system.drawing;//provides basic functionality for drawing GDI + graphics
Using system.drawing.text;//provides advanced functionality for drawing GDI + graphics
Using system.drawing.drawing2d;//provides picture advanced two-dimensional, vector graphics function
Using system.drawing.imaging;//provides advanced functionality for drawing GDI + graphics

Namespace Drawpicture
{
<summary>
Summary description of the Barchart.
</summary>
public class Barchart
{
private int pic_width = 410;
private int pic_height = 320;

public static bool Hasneg = FALSE;

Private Const string Fontword = "Arial";
Private Const int fontsize = 9;

   public  int side_width = 400;
   public  int side_height = 400;
   private const int chart_top = 60;
   private  int chart_height = 300;
   private const int chart_left = 60;
   private const int chart_width =;

   public void Render (string[] word,int[] data, out string fileName)
   {
&NBSP;&NBSP;&NBSP;&NBSP
    for (int i=0;i<data. length;i++)
    {
     if (data[i]<0)
      {
      pic_height *=2;
      hasneg = true;
      side_height = (int) (side_height*1.5);
      chart_height = (int) (chart_height*0.3);
      break;
     }
    }
    chartutil cu = new Chartutil ();

Pointf[] Zuobiaostart;
Pointf[] Zuobiaoend;
Graphics G;
Bitmap BM;
Createcanvas (out of BM, out of G, out of zuobiaoend, out ZUOBIAOSTART,CU);

Draw axes
int chidu = drawaxes (data, Zuobiaostart, G, ZUOBIAOEND,CU);

Draw a bar chart
float barwidth = chart_width/(2 * 2);
PointF barorigin = new PointF (Chart_left + (BARWIDTH/2), 0);
float barheight = 2;
for (int i=0;i<2;i++)
{
Barheight = ((float) data[i]/chidu) * (CHART_HEIGHT/5);
if (barheight<0)
{
BARORIGIN.Y = Chart_top + chart_height;
}
Else
{
BARORIGIN.Y = Chart_top + chart_height-barheight;
}

G.fillrectangle (New SolidBrush (Chartutil.getchartitemcolor (i)), Barorigin.x,barorigin.y,barwidth,math.abs ( Barheight));
barorigin.x = barorigin.x + (BarWidth * 2);
}


Illustration of the upper right corner of the drawing
Drawinstruction (Chart_left, Chart_height, chart_top, G, Word, data);

Output graphics
FileName = cu. Picpath + guid.newguid (). ToString () + ". gif";
Bm. Save (FileName, imageformat.gif);

Resource Recycling
Bm. Dispose ();
G.dispose ();
}

   private  int drawaxes (int[] data, pointf[] Zuobiaostart, Graphics G, pointf[] zuobiaoend, Chartutil cu)
   {
    int chidu =1;
    int[] t = cu.getzuobiaovalue (data,out chidu);
    for (int i=0;i<zuobiaostart.length;i++)
    {
      pointf Txtpos = new PointF ();
     txtpos.x = Zuobiaostart[i]. X-50;
     txtpos.y = Zuobiaostart[i]. Y-5;
     g.drawstring (T[i]. ToString (), New Font (fontword,8), brushes.black,txtpos);
     g.drawline (Pens.black,zuobiaostart[i],zuobiaoend[i]);    
&NBSP;&NBSP;&NBSP;&NBSP}
    return Chidu;
   .}

   private  void Createcanvas (out of Bitmap BM, out of Graphics G, out pointf[) Zuobiaoend, out pointf[] Zuobiaostart,chartutil cu)
   {
    //Establish a Graphics object instance
   &NBSP;&NBSP;BM = new Bitmap (pic_width,pic_height);
    g = graphics.fromimage (BM);
    //layout Graphic and Text properties

    g.scaletransform (Convert.tosingle (pic_width))/side_width, Convert.ToSingle (Pic_ Height))/side_height);
    g.smoothingmode = Smoothingmode.default;
    g.textrenderinghint = Textrenderinghint.antialias;
 
    //set the canvas and Edge
    g.clear (Color.White);
    g.drawrectangle (pens.black,0,0,side_width-1,side_height-1);
 
    //Set the edge of the bar (
    g.drawrectangle) (The new Pen (Color.Black, 1), Chart_left,chart_top,chart_width, chart_height);
    if (Hasneg)
    {
     g. DrawRectangle (New Pen (color.black,1), Chart_left,chart_top+chart_height,chart_width, chart_height);
    }

Zuobiaoend = null;
Zuobiaostart = Cu.getzuobiaopoint (new PointF (Chart_top,chart_left), Chart_height,chart_width,out ZuoBiaoEnd,hasNeg) ;
}

private void drawinstruction (int chart_left, int chart_height, int chart_top, Graphics g, string[] word, int[] data)
{
PointF colsnamepoint = new PointF (chart_left + 55,chart_height + chart_top + 2);
if (Hasneg)
{
Colsnamepoint = new PointF (chart_left + 55,chart_height*2 + chart_top + 2);
}

PointF boxorigin = new PointF (PIC_WIDTH*5/6-30,CHART_TOP*1/3);
PointF textorigin = new PointF (PIC_WIDTH*4/5+8,CHART_TOP*1/3-3);
for (int i=0;i<2;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 (word[i],new Font (fontword,fontsize), brushes.darkblue,colsnamepoint);
g.DrawString (Data[i]. ToString (), New Font (fontword,fontsize), brushes.black,textorigin);
Colsnamepoint.x + 150;
BOXORIGIN.Y + 15;
TEXTORIGIN.Y + 15;
}
}
}
public class Chartutil
{

Public readonly String picpath = System.AppDomain.CurrentDomain.BaseDirectory + "temp/";

Public pointf[] Getzuobiaopoint (PointF orign,int height,int width,out pointf[] Endpoint,bool Hasneg)
{
int num = 6;
if (hasneg) num = 11;
pointf[] StartPoint = new Pointf[num];
EndPoint = new Pointf[num];

for (int i =0;i<num;i++)
{
PointF Pfstart = new PointF ();
PointF pfend = new PointF ();
Pfstart.x = Orign. X
Pfend.x = Orign. X + width;
Pfstart.y = Orign. Y + I*HEIGHT/5;
Pfend.y = Pfstart.y;
Startpoint[i] = Pfstart;
Endpoint[i] = pfend;
}
return startpoint;
}
Public int[] Getzuobiaovalue (int[] data,out int chidu)
{
Int[] result = new INT32[11];
int Max = data[0];

for (int i=0;i<data. length;i++)
{
if (Max < data[i])
Max = Data[i];
}
String Strmax = Max + "";
Chidu = (int) ((Convert.ToInt32 (strmax.substring (0,1)) + 1) * MATH.POW (10,STRMAX.LENGTH-1))/5;
for (int i=0;i<result. length;i++)
{
Result[i] = chidu* (5-i);
}
return result;
}

#region Get Color
public static Color getchartitemcolor (int itemindex)
{
Color Selectedcolor;
Switch (itemindex)
{
Case 0:
Selectedcolor = Color.Blue;
Break
Case 1:
Selectedcolor = color.red;
Break
Case 2:
Selectedcolor = Color.yellow;
Break
Case 3:
Selectedcolor = Color.purple;
Break
Default
Selectedcolor = Color.green;
Break
}
return selectedcolor;
}
#endregion
}
}