JSP implementation to generate the Chinese flag picture effect code _JSP programming

Source: Internet
Author: User
Tags cos sin

This article describes the JSP implementation of the creation of the Chinese flag picture effect code. Share to everyone for your reference, specific as follows:

Picture screenshot as follows:

The specific code is as follows:

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <%@ page contenttype= "image/jpeg" Import = "java.awt.*, java.awt.image.*,java.util.*,javax.imageio.*,java.awt.shape.*,java.awt.geom.*,
 com.sun.image.codec.jpeg.* "%> <% out.clear ();
 Response.setcontenttype ("Image/jpeg");
 Response.setheader ("Pragma", "No-cache");
 Response.setheader ("Cache-control", "No-cache");
 Response.setdateheader ("Expires", 0);
 int width = 300; 
   int height = width/3*2; 
   Double maxr = 0.15, MinR = 0.05; 
   Double MaxX = 0.50, Maxy = 0.50; 
   Double[] MinX = {0.75, 0.85, 0.85, 0.75}; 
 Double[] Miny = {0.35, 0.45, 0.60, 0.70};
 BufferedImage image = new BufferedImage (width, height, bufferedimage.type_int_rgb);
 Java.awt.Graphics2D g= (Java.awt.Graphics2D) image.creategraphics ();
 G.clearrect (0, 0,width,height);
 G.setrenderinghint (renderinghints.key_antialiasing, renderinghints.value_antialias_on);
 Draw chess face G.setcolor (java.awt.Color.red);
 G.fillrect (0, 0, width, height); g.fiLlrect (x, m, width, height);
 G.setcolor (Java.awt.Color.yellow);
 Draw big stars Double ox = height*maxx, oy = Height*maxy; 
 G.fill (Createpentacle (OX,OY,HEIGHT*MAXR,-MATH.PI/2)); 
      Draw a small pentagram for (int idx =0;idx < 4;idx + +) {Double SX = minx[idx]*height, sy = miny[idx]*height; 
      Double theta = math.atan2 (OY-SY,OX-SX); 
    G.fill (Createpentacle (Sx,sy,height*minr,theta));
 } g.dispose (); 
 Out.clearbuffer ();
 out = Pagecontext.pushbody ();
  Imageio.write (Image, "JPEG", Response.getoutputstream ());
    Servletoutputstream OutStream = Response.getoutputstream ();
    JPEGImageEncoder encoder =jpegcodec.createjpegencoder (OutStream);
    Encoder.encode (image);
Outstream.close ();
 %> <%! public static Java.awt.Shape createpentacle (double sx, double sy, double radius,double theta) {Final double arc = math.p
 Final double rad = Math.sin (MATH.PI/10)/Math.sin (3 * MATH.PI/10);
 GeneralPath path = new GeneralPath ();
 Path.moveto (1, 0); for (int idx = 0; IDX < 5;
  idx++) {Path.lineto (RAD * Math.Cos (1 + 2 * idx) * arc), RAD * Math.sin ((1 + 2 * idx) * arc));
 Path.lineto (Math.Cos (2 * (idx + 1) * arc), Math.sin (2 * (idx + 1) * arc));
 } path.closepath ();
 AffineTransform ATF = affinetransform.getscaleinstance (radius, radius);
 Atf.translate (Sx/radius, Sy/radius);
 Atf.rotate (theta);
 return Atf.createtransformedshape (path);


Save the code as a JSP file and execute it under the run directory.

The code is tested under tomcat6.0

I hope this article will help you with JSP program design.

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