在Graphics上绘制BufferedImage的一个简单示例代码,Java代码库,德仔网

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【Java】在Graphics上绘制BufferedImage的一个简单示例
作者:Dezai.CN / 发布于2011/12/1/ 722
主要功能是将一个图片切割成为4份(2行 * 2列)，然后再将切分后的4个子图像进行乱序，换句话说，就是让切割后的子图像不在显示在原有的位置上，最后渲染到Swing的组件上
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<pre><span style="color: #008080"> 1</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span> MyTest <span style="color: #0000ff">extends</span> JPanel {<span style="color: #008080"> 2</span>         <span style="color: #0000ff">private</span> <span style="color: #0000ff">int</span> numlocs = 2;<span style="color: #008080"> 3</span>         <span style="color: #0000ff">private</span> <span style="color: #0000ff">int</span> numcells = numlocs * numlocs;<span style="color: #008080"> 4</span>         <span style="color: #0000ff">private</span> <span style="color: #0000ff">int</span>[] cells;<span style="color: #008080"> 5</span>         <span style="color: #0000ff">private</span> BufferedImage bi;<span style="color: #008080"> 6</span>         <span style="color: #0000ff">private</span> <span style="color: #0000ff">int</span> w, h, cw, ch;<span style="color: #008080"> 7</span>         <span style="color: #0000ff">public</span> MyTest() {<span style="color: #008080"> 8</span>             <span style="color: #0000ff">try</span> {<span style="color: #008080"> 9</span>                 bi = ImageIO.read(<span style="color: #0000ff">new</span> File("D:/desktop.png"));<span style="color: #008080">10</span>                 w = bi.getWidth();<span style="color: #008080">11</span>                 h = bi.getHeight();<span style="color: #008080">12</span>             } <span style="color: #0000ff">catch</span> (IOException e) {<span style="color: #008080">13</span>                 e.printStackTrace();<span style="color: #008080">14</span>             }<span style="color: #008080">15</span>             <span style="color: #008000">//</span><span style="color: #008000">将整个图片分隔成为4分，2行 * 2列，这里cx和cy是每个子图片的宽和高</span><span style="color: #008000"></span><span style="color: #008080">16</span>             cw = w / numlocs;<span style="color: #008080">17</span>             ch = h / numlocs;<span style="color: #008080">18</span>             cells = <span style="color: #0000ff">new</span> <span style="color: #0000ff">int</span>[numcells];<span style="color: #008080">19</span>             <span style="color: #008000">//</span><span style="color: #008000">初始化每个子图片的位置信息</span><span style="color: #008000"></span><span style="color: #008080">20</span>             <span style="color: #0000ff">for</span> (<span style="color: #0000ff">int</span> i = 0; i < numcells; i++)<span style="color: #008080">21</span>                 cells[i] = i;<span style="color: #008080">22</span>         }<span style="color: #008080">23</span>         <span style="color: #0000ff">void</span> doExchange() {<span style="color: #008080">24</span>             Random rand = <span style="color: #0000ff">new</span> Random();<span style="color: #008080">25</span>             <span style="color: #0000ff">int</span> ri;<span style="color: #008080">26</span>             <span style="color: #008000">//</span><span style="color: #008000">将2 * 2 = 4个图片的位置通过随机数的方式打乱。</span><span style="color: #008000"></span><span style="color: #008080">27</span>             <span style="color: #0000ff">for</span> (<span style="color: #0000ff">int</span> i = 0; i < numcells; i++) {<span style="color: #008080">28</span>                 <span style="color: #0000ff">while</span> ((ri = rand.nextInt(numlocs)) == i) {<span style="color: #008080">29</span>                 }<span style="color: #008080">30</span>                 <span style="color: #0000ff">int</span> tmp = cells[i];<span style="color: #008080">31</span>                 cells[i] = cells[ri];<span style="color: #008080">32</span>                 cells[ri] = tmp;<span style="color: #008080">33</span>             }<span style="color: #008080">34</span>         }<span style="color: #008080">35</span>         <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span> paintComponent(Graphics g) {<span style="color: #008080">36</span>             <span style="color: #0000ff">super</span>.paintComponent(g);<span style="color: #008080">37</span>             <span style="color: #0000ff">int</span> dx, dy;<span style="color: #008080">38</span>             <span style="color: #008000">//</span><span style="color: #008000">逐个渲染乱序后的每个子图片</span><span style="color: #008000"></span><span style="color: #008080">39</span>             <span style="color: #0000ff">for</span> (<span style="color: #0000ff">int</span> x = 0; x < numlocs; x++) {<span style="color: #008080">40</span>                 <span style="color: #0000ff">int</span> sx = x * cw;<span style="color: #008080">41</span>                 <span style="color: #0000ff">for</span> (<span style="color: #0000ff">int</span> y = 0; y < numlocs; y++) {<span style="color: #008080">42</span>                     <span style="color: #0000ff">int</span> sy = y * ch;<span style="color: #008080">43</span>                     <span style="color: #0000ff">int</span> cell = cells[x * numlocs + y];<span style="color: #008080">44</span>                     dx = (cell / numlocs) * cw;<span style="color: #008080">45</span>                     dy = (cell % numlocs) * ch;<span style="color: #008080">46</span>                     <span style="color: #008000">//</span><span style="color: #008000">参数说明：</span><span style="color: #008080">47</span> <span style="color: #008000">                    </span><span style="color: #008000">//</span><span style="color: #008000">BufferedImage: 目标绘制图像缓冲区</span><span style="color: #008080">48</span> <span style="color: #008000">                    </span><span style="color: #008000">//</span><span style="color: #008000">dx1,dy1: 绘制目标的左上角x,y坐标</span><span style="color: #008080">49</span> <span style="color: #008000">                    </span><span style="color: #008000">//</span><span style="color: #008000">dx2,dy2: 绘制目标的右下角x,y坐标</span><span style="color: #008080">50</span> <span style="color: #008000">                    </span><span style="color: #008000">//</span><span style="color: #008000">sx1,sy1: 源图像(第一个参数)的左上角x,y坐标</span><span style="color: #008080">51</span> <span style="color: #008000">                    </span><span style="color: #008000">//</span><span style="color: #008000">sx2,sy2: 源图像(第一个参数)的右下角x,y坐标</span><span style="color: #008000"></span><span style="color: #008080">52</span>                     g.drawImage(bi, dx, dy, dx + cw, dy + ch, sx, sy, sx + cw, sy + ch, <span style="color: #0000ff">null</span>);<span style="color: #008080">53</span>                 }<span style="color: #008080">54</span>             }<span style="color: #008080">55</span>         }<span style="color: #008080">56</span>         <span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span> <span style="color: #0000ff">void</span> main(String[] args) {<span style="color: #008080">57</span>             JFrame frame = <span style="color: #0000ff">new</span> JFrame();<span style="color: #008080">58</span>             frame.setTitle("BufferedImage");<span style="color: #008080">59</span>             frame.setSize(1000, 600);<span style="color: #008080">60</span>             frame.addWindowListener(<span style="color: #0000ff">new</span> WindowAdapter() {<span style="color: #008080">61</span>                 <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span> windowClosing(WindowEvent e) {<span style="color: #008080">62</span>                     System.exit(0);<span style="color: #008080">63</span>                 }<span style="color: #008080">64</span>             });<span style="color: #008080">65</span>             Container contentPane = frame.getContentPane();<span style="color: #008080">66</span>             MyTest p = <span style="color: #0000ff">new</span> MyTest();<span style="color: #008080">67</span>             contentPane.add(p);<span style="color: #008080">68</span>             p.doExchange();<span style="color: #008080">69</span>             frame.show();<span style="color: #008080">70</span>         }<span style="color: #008080">71</span>     }</pre>
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　BufferedImage　
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