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1 package nabble.view.web.util;
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2
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3 import fschmidt.util.java.IoUtils;
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4 import fschmidt.util.servlet.JtpContext;
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5 import nabble.view.lib.UrlMappable;
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6
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7 import javax.imageio.ImageIO;
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8 import javax.servlet.ServletException;
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9 import javax.servlet.http.HttpServlet;
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10 import javax.servlet.http.HttpServletRequest;
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11 import javax.servlet.http.HttpServletResponse;
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12 import java.awt.AlphaComposite;
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13 import java.awt.Color;
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14 import java.awt.Graphics2D;
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15 import java.awt.RenderingHints;
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16 import java.awt.Shape;
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17 import java.awt.geom.Ellipse2D;
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18 import java.awt.image.BufferedImage;
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19 import java.awt.image.RenderedImage;
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20 import java.io.ByteArrayInputStream;
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21 import java.io.ByteArrayOutputStream;
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22 import java.io.IOException;
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23 import java.io.InputStream;
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24 import java.io.OutputStream;
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25 import java.util.HashMap;
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26 import java.util.Map;
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27 import java.util.regex.Matcher;
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28 import java.util.regex.Pattern;
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29
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30 /**
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31 * Quadrants
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32 * 1 | 2
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33 * 3 | 4
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34 *
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35 * @author Hugo Teixeira
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36 */
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37 public class RoundedCorner extends HttpServlet implements UrlMappable {
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38
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39 private static final Pattern URL_PATTERN = Pattern.compile("/rounded/q(\\d)_([A-Fa-f0-9]{6})([A-Fa-f0-9]{2})?$");
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40
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41 public Map<String,String[]> getParameterMapFromUrl(HttpServletRequest request,String mappedUrl) {
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42 Matcher m = URL_PATTERN.matcher(mappedUrl);
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43 if( !m.find() )
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44 throw new RuntimeException();
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45 Map<String,String[]> params = new HashMap<String,String[]>();
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46 String quadrant = m.group(1);
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47 params.put("quadrant",new String[]{quadrant});
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48 String bgColor = m.group(2) + (m.group(3) == null? "" : m.group(3));
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49 params.put( "bgColor", new String[]{bgColor} );
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50 return params;
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51 }
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52
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53 public Pattern getUrlPattern() {
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54 return URL_PATTERN;
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55 }
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56
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57 protected void service(HttpServletRequest request, HttpServletResponse response)
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58 throws ServletException, IOException {
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59 OutputStream out = response.getOutputStream();
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60 response.setContentType("image/png");
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61
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62 JtpContext jtpContext = (JtpContext)getServletContext().getAttribute(JtpContext.attrName);
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63 jtpContext.setEtag(request,response);
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64
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65 int quadrant = Integer.valueOf(request.getParameter("quadrant"));
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66 String bgColor = request.getParameter("bgColor");
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67
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68 ByteArrayOutputStream baos = new ByteArrayOutputStream();
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69 ImageIO.write(createImage(quadrant, bgColor), "png", baos);
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70 final byte[] bytes = baos.toByteArray();
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71
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72 InputStream in = new ByteArrayInputStream(bytes);
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73 try {
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74 IoUtils.copyAll(in,out);
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75 } finally {
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76 in.close();
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77 }
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78 }
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79
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80 private RenderedImage createImage(int quadrant, String bgColor) {
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81 int radius = 12;
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82 int[] xy = { 0, 0 };
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83 if (quadrant == 2) xy = new int[]{ -radius, 0 };
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84 else if (quadrant == 3) xy = new int[]{ 0, -radius };
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85 else if (quadrant == 4) xy = new int[]{ -radius, -radius };
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86
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87 Color bg = parseColor(bgColor);
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88 BufferedImage img = new BufferedImage(radius, radius, BufferedImage.TYPE_INT_ARGB);
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89 Graphics2D g2 = img.createGraphics();
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90 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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91 g2.setColor(bg);
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92 g2.fillRect(0, 0, radius, radius);
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93 g2.setComposite(AlphaComposite.getInstance(AlphaComposite.CLEAR, 0.5f));
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94 Shape s = new Ellipse2D.Float(xy[0], xy[1], 2 * radius, 2* radius);
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95 g2.fill(s);
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96 g2.dispose();
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97 return img;
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98 }
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99
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100 private Color parseColor(String c) {
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101 if (c.length() == 6)
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102 return Color.decode("0x"+c);
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103 int r = Integer.parseInt(c.substring(0,2), 16);
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104 int g = Integer.parseInt(c.substring(2,4), 16);
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105 int b = Integer.parseInt(c.substring(4,6), 16);
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106 int a = Integer.parseInt(c.substring(6,8), 16);
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107 return new Color(r, g, b, a);
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108 }
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109 } |
