Java to draw a pie chart

<% @ Page Language = "Java" contenttype = "image/PNG; charset = GBK" pageencoding = "GBK"
Import = "Java. AWT. *, javax. ImageIO. *, java. AWT. Geom. *, java. AWT. image. *" %>

<%! // Description of creating a pie chart

Public void drawtips (string tips, color, arc2d. Double arc2d, graphics2d g2d ){

Arc2d. Double position = arc2d;

Position. setangleextent (arc2d. getangleextent ()/2 );

Position. x = arc2d. X-15;

Position. Y = arc2d. Y-15;

Position. width = arc2d. getwidth () + 50;

Position. Height = arc2d. getheight () + 50;

Point2d. Double endpoint = (point2d. Double) position. getendpoint ();

G2d. setpaint (color );

Int stringlength = g2d. getfontmetrics (). stringwidth (TIPS );

If (endpoint. x <= arc2d. getcenterx ())

G2d. drawstring (TIPS, (float) endpoint. X-stringlength,

(Float) endpoint. y );

Else {

G2d. drawstring (TIPS, (float) endpoint. X, (float) endpoint. y );
}

}
%>

<%
// Clear the buffer
Response. Reset ();

// Note the MIME type here
Response. setcontenttype ("image/PNG ");

// Create an image of 500x375
Int width = 500, Height = 375;

Bufferedimage image = new bufferedimage (width, height,

Bufferedimage. type_int_rgb );

// Create a java2d object
Graphics2d g2d = image. creategraphics ();

// Fill in the entire background
G2d. setpaint (color. White );

G2d. fillrect (0, 0, width, height );

// Draw a shadow, which consists of a gray progressive rounded rectangle.
Gradientpaint graygp = new gradientpaint (0, 0, color. Gray, width,

Height, new color (218,214,212), false );

G2d. setpaint (graygp );

Roundrectangle2d. Float bgrr = new roundrectangle2d. Float (5, 5,

Width-5, height-5, 50, 50 );

G2d. Fill (bgrr );

// Draw a progressive blue rounded rectangle background
Gradientpaint bluegp = new gradientpaint (0, 0, new color (252,197,

113), width/2, height/2, new color (255,255,169), true );

G2d. setpaint (bluegp );

G2d. fillroundrect (0, 0, width-5, height-5, 50, 50 );

// Draw the rectangular contour of the dark blue rounded corner
Basicstroke BS = new basicstroke (1.2f );

G2d. setstroke (BS );

G2d. setpaint (new color (55, 71,105 ));

G2d. drawroundrect (0, 0, width-5, height-5, 50, 50 );

// Draw the chart title
// String charttitle = "customer composition analysis ";

G2d. setcolor (color. Black );

G2d. setfont (new font ("", Font. Plain, 30 ));

// Int stringlength = g2d. getfontmetrics (). stringwidth (charttitle );

// G2d. drawstring (charttitle, (width-stringlength)/2, 30 );

// Define the Arc
Arc2d. Double arc2d = new arc2d. Double ();

Double startangle = 30.0, arcangle = 0.0;

Double rectwidth = 295.0, rectheight = 245.0;

Point2d. Double P2D = new point2d. Double (width-rectwidth)/2, 70.0 );

Int arctype = arc2d. Pie;

Color color [] = new color [5];

Color [0] = new color (99, 99, 0 );

Color [1] = new color (255,169, 66 );

Color [2] = new color (33,255, 66 );

Color [3] = new color (33, 0,255 );

Color [4] = new color (255, 0, 66 );

Double booksales [] = new double [5];

Double totalsales = 0.0;

// Define the thickness
Int Thickness = 25;

For (INT I = 0; I <booksales. length; I ++ ){

Booksales [I] = 1 + math. Random () * 99;

Totalsales + = booksales [I];

}

// Draw an arc with the starting angle not greater than 90 degrees
Startangle = 30;

For (INT I = 0; I <booksales. length; I ++ ){

Arcangle = booksales [I];

If (startangle> = 90 ){

Break;

}

For (Int J = thickness; j> 0; j --){

G2d. setcolor (color [I]. Darker ());

Arc2d = new arc2d. Double (P2D. X, P2D. Y + J, rectwidth,

Rectheight, startangle, arcangle, arctype );

// Fill the Arc
G2d. Fill (arc2d );

}

// Update the starting angle of the arc
Startangle + = arcangle;

}

// Draw an arc with the starting angle not less than 270 degrees
Startangle = 390;

For (INT I = booksales. Length-1; I> 0; I --){

Arcangle = booksales [I];

If (startangle <= 270 ){

Break;

}

For (Int J = thickness; j> 0; j --){

G2d. setcolor (color [I]. Darker ());

Arc2d = new arc2d. Double (P2D. X, P2D. Y + J, rectwidth,

Rectheight, startangle,-arcangle, arctype );

// Fill the Arc
G2d. Fill (arc2d );

}

// Update the starting angle of the arc
Startangle-= arcangle;

}

// Draw an arc with the starting angle between 90 degrees and 270 degrees
Startangle = 30;

For (INT I = 0; I <booksales. length; I ++ ){

Arcangle = booksales [I];

If (startangle> 90 & startangle <270 ){

For (Int J = thickness; j> 0; j --){

G2d. setcolor (color [I]. Darker ());

Arc2d = new arc2d. Double (P2D. X, P2D. Y + J, rectwidth,

Rectheight, startangle + arcangle,-arcangle,

Arctype );

// Fill the Arc
G2d. Fill (arc2d );

}

}

// Update the starting angle of the arc
Startangle + = arcangle;

}

// Draw the Top Arc
Startangle = 30;

For (INT I = 0; I <booksales. length; I ++ ){

Arcangle = booksales [I]; // item. getpercent () * 3.6;

G2d. setcolor (color [I]);

Arc2d = new arc2d. Double (P2D. X, P2D. Y, rectwidth, rectheight,

Startangle, arcangle, arctype );

// Fill the Arc
G2d. Fill (arc2d );

// Depicts the arc Contour
G2d. setstroke (New basicstroke (1.2f ));

G2d. setpaint (color. Gray );

G2d. Draw (arc2d );

// Update the starting angle of the arc
Startangle + = arcangle;

G2d. setfont (new font ("", Font. Plain, 12 ));

}

// Deploy the image
G2d. Dispose ();

// Use the write method of the ImageIO class to encode the image
Servletoutputstream SOS = response. getoutputstream ();

ImageIO. Write (image, "PNG", SOS );

SOS. Close ();

Out. Clear ();

Out = pagecontext. pushbody ();
%>