A pie chart report

I recently made a graphical report on counting the number of votes. I used an example in 51aspx to show multiple images on one page, so I chose to dynamically Add the image control to the pannel. as follows:


/// <Summary>
/// Pie chart report
/// </Summary>
/// <Param name = "target"> Stream object instance </param>
/// <Param name = "p_dt"> data source </param>
/// <Param name = "p_strtitle"> title </param>
/// <Param name = "p_strtext"> subtitle field </param>
/// <Param name = "p_strcount"> count field </param>
Public void drawpic (stream target, p_able p_dt, string p_strtitle, string p_strtext, string p_strcount)
{
// Datatable m_dt = qvoteservice. instance (). getvotecount (p_strfid );
Float [] angle = new float [p_dt.rows.count];
String [] stxt = new string [p_dt.rows.count];
Float allcount = 0;

For (INT I = 0; I <p_dt.rows.count; I ++)
{
Datarow m_dr = p_dt.rows [I];
Allcount + = convert. tosingle (m_dr [p_strcount]. tostring ());

}
// Proportion of calculation options in the population
For (INT I = 0; I <p_dt.rows.count; I ++)
{
Datarow m_dr = p_dt.rows [I];
If (allcount! = 0)
{
Angle [I] = convert. tosingle (m_dr [p_strcount]. tostring () * 360.0f/allcount;
Stxt [I] = m_dr [p_strtext]. tostring () + "" + (math. round (convert. tosingle (m_dr [p_strcount]. tostring ()/allcount, 2) * 100 + "% ";
}
Else
{
Angle [I] = convert. tosingle (1 * 360.0f/p_dt.rows.count );
Stxt [I] = m_dr [p_strtext]. tostring () + "+ (convert. tosingle (1/p_dt.rows.count) * 100 +" % ";
}
}

Float x = 75.0f, y = 65.0f, D = 100366f, offset = 15.0f, X1 = 0.0f, Y1 = 0.0f; // Circular X, Y coordinate, radius, offset distance, X, offset Value in the Y direction
Float curangle = 0.0f; // current conversion Angle

Int ox = 100, oy = 100; // Center Coordinate
Int px1 = 0, py1 = 0, px2 = 0, py2 = 0; // the endpoint of the straight line

System. drawing. image bitmap = new Bitmap (385,200, system. drawing. imaging. pixelformat. format32bpppargb); // creates a bitmap object, which provides memory space for the image to be created
Graphics G = graphics. fromimage (Bitmap); // generates a graphics object, which encapsulates the GDI + drawing interface.

G. interpolationmode = system. Drawing. drawing2d. interpolationmode. High;
G. smoothingmode = system. Drawing. drawing2d. smoothingmode. highquality;

// 20 colors.
Color [] color = new color [] {color. papayawhip, color. red, color. salmon, color. thistle, color. blue, color. coral, color. darkgoldenrod, color. black, color. firebrick, color. gold, color. honeydew, color. indigo, color. khaki, color. lemonchiffon, color. maroon, color. navy,
Color. Orange, color. Violet, color. Wheat, color. yellowgreen };

G. Clear (color. fromargb (227,240,255); // clear the screen

Stringformat Sf = new stringformat ();
SF. Alignment = stringalignment. Center;

G. drawstring (p_strtitle, new font (fontfamily. genericsansserif, 8), new solidbrush (color. black), new rectanglef (0.0f, 10.0f, 420366f, 20366f), SF); // Title

// Draw the large rectangle on the right
G. fillrectangle (New solidbrush (color. fromargb (128,128,128), 457,105,150, (angle. Length + 1) * 12); // shadow
G. fillrectangle (New solidbrush (color. fromargb (253,245,230), 455,105,150, (angle. Length + 1) * 12); // foreground
G. drawrectangle (new pen (color. fromargb (128,128,128), 1), 455,105,150, (angle. Length + 1) * 12); // Contour
/**/
//////////////////////////////////////// /////

For (INT I = 0; I <angle. length; I ++)
{
SF. Alignment = stringalignment. Near;

Ox = convert. toint32 (x + D/2 );
Oy = convert. toint32 (Y + D/2 );

Px1 = convert. toint32 (D/2 + 20) * Math. Cos (curangle + angle [I]/2) * Math. PI/180.0f) + ox;
Py2 = py1 = convert. toint32 (D/2 + 20) * Math. sin (curangle + angle [I]/2) * Math. PI/180.0f) + Oy;

If (curangle + angle [I]/2) >=270 | (curangle + angle [I]/2) <90) px2 = px1 + 10;
Else px2 = px1-10;

// G. drawline (new pen (color. fromargb (120,120,120), 1), new point (OX, Oy), new point (px1, py1); // draw a straight line-release.
// G. drawline (new pen (color. fromargb (120,120,120), 1), new point (px1, py1), new point (px2, py2); // straight line

// If (curangle + angle [I]/2)> = 270 | (curangle + angle [I]/2) <90)
//{

// G. drawstring (stxt [I], new font (fontfamily. genericsansserif, 8), new solidbrush (color. fromargb (120,120,120), px2, py2-4, SF );
//}
// Else
//{

// G. drawstring (stxt [I], new font (fontfamily. genericsansserif, 8), new solidbrush (color. fromargb (120,120,120), px2-stxt [I]. length * 12-2, py2-4, SF );
//}

G. fillpie (New solidbrush (color. fromargb (128,128,128), X + 2, Y + 2, D, D, curangle, angle [I]);
G. fillpie (New solidbrush (color [I]), X, Y, D, D, curangle, angle [I]);

G. drawpie (new pen (color. fromargb (128,128,128), 0), X, Y, D, D, curangle, angle [I]);
Curangle + = angle [I];

// Draw a small rectangle on the right and text
G. fillrectangle (New solidbrush (color. fromargb (128,128,128), 427, I * 14 + 6 + 58 + 2, 20, 10); // shadow
G. fillrectangle (New solidbrush (color [I]), 207, I * 14 + 6 + 60, 20, 10); // foreground
G. drawrectangle (new pen (color. fromargb (120,120,120), 1), 207, I * 14 + 6 + 60, 20, 10); // Contour
G. drawstring (stxt [I], new font (fontfamily. genericsansserif, 8), new solidbrush (color. fromargb (80, 80, 80), 227, I * 14 + 6 + 60, SF );
}
Bitmap. Save (target, imageformat. GIF );
Bitmap. Dispose ();
G. Dispose ();
}
/// Dynamic addition in pannel
Datatable m_dt = Data Source
For (INT I = 0; I <m_dt.rows.count; I ++)
{
Image m_img = new image ();
M_img.style.add ("margin-top", "5px ");
M_img.style.add ("float", "Left ");
M_img.style.add ("margin-left", "5px ");
M_img.imageurl = "graphicstatements. aspx? FID = "+ m_dt.rows [I] [" FID "]. tostring () + "& ftitle =" + server. urlencode (m_dt.rows [I] ["ftitle"]. tostring ());
Panel1.controls. Add (m_img );
}