图形学实验报告

学院：计算机学院实验课程：计算机图形学实验项目：制作一个绘图界面开课时间：2015 ～2016年度第1学期指导老师：杨晋吉专业：计算机科学与技术（师范）华南师范大学教务处一、实验目的利用计算机编程语言绘制图形，主要实现了以下内容：（1）画线（2）画圆（3）画多边形（矩形和圆角矩形）（4）填充（5）变换（平移、旋转、比例变换）二、实验环境Windows 8.0 操作系统，NetBean6.5，Java语言三、实验过程（1）窗口界面功能JFrame类JToolBar类工具栏MouseAdapter类鼠标位置显示JPanel类画图区域JLabel类标签栏（2）菜单栏可实现功能（3）画画区域内可实现功能菜单栏 Help 帮助 Stroke 粗细File （文件） Color 颜色 New （更新） Save （保存）Load （下载）Exit （退出）四、各功能实现算法及截图1）Pencil类-随笔画算法：class Pencil extends drawings//随笔画类{void draw(Graphics2D g2d) {g2d.setPaint(new Color(R, G, B));g2d.setStroke(new BasicStroke(stroke,BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));g2d.drawLine(x1, y1, x2, y2);}}截图：2）Line类-画直线算法：class Line extends drawings //直线类{void draw(Graphics2D g2d) {g2d.setPaint(new Color(R, G, B));g2d.setStroke(new BasicStroke(stroke,BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));g2d.drawLine(x1, y1, x2, y2);System.out.println(" Line ");}}截图：3）Rect类-画矩形算法：class Rect extends drawings//矩形类{void draw(Graphics2D g2d) {g2d.setPaint(new Color(R, G, B));g2d.setStroke(new BasicStroke(stroke));g2d.drawRect(Math.min(x1, x2), Math.min(y1, y2),Math.abs(x1 - x2), Math.abs(y1 - y2));}}截图：4）RoundRect类-画圆角矩形算法：class RoundRect extends drawings//圆角矩形类{void draw(Graphics2D g2d) {g2d.setPaint(new Color(R, G, B));g2d.setStroke(new BasicStroke(stroke));g2d.drawRoundRect(Math.min(x1, x2), Math.min(y1, y2),Math.abs(x1 - x2), Math.abs(y1 - y2),50, 35);System.out.println(" RoundRect ");}}截图：5）Oval类-画椭圆算法：class Oval extends drawings//椭圆类{void draw(Graphics2D g2d) {g2d.setPaint(new Color(R, G, B));g2d.setStroke(new BasicStroke(stroke));g2d.drawOval(Math.min(x1, x2), Math.min(y1, y2),Math.abs(x1 - x2), Math.abs(y1 - y2));}}截图：6）Circle类-画圆算法：class Circle extends drawings//圆类{void draw(Graphics2D g2d) {g2d.setPaint(new Color(R, G, B));g2d.setStroke(new BasicStroke(stroke));g2d.drawOval(Math.min(x1, x2), Math.min(y1, y2),Math.max(Math.abs(x1 - x2), Math.abs(y1 - y2)),Math.max(Math.abs(x1 - x2), Math.abs(y1 - y2)));}}截图：7）橡皮擦算法：class Rubber extends drawings//橡皮擦类{void draw(Graphics2D g2d) {g2d.setPaint(new Color(255, 255, 255));g2d.setStroke(new BasicStroke(stroke + 4,BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));g2d.drawLine(x1, y1, x2, y2);}}截图：8）填充算法：int tu[][] ;public void setColor(int x, int y,Graphics2D g2d){Color newColor = new Color(R,G,B);g2d.setPaint(newColor);g2d.setStroke(new BasicStroke(stroke,BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));g2d.drawLine(x, y, x, y);tu[x][y] = get(newColor);System.out.println("tu"+tu[x][y]);// g2d.drawLine(x, y, x+1, y);//g2d.drawLine(x, y, x, y+1);// g2d.drawLine(x, y, x+1, y+1);}public void floodFill8(int x, int y,int newColor,int oldColor,Graphics2D g2d,Point s){int haColor = getpixel(x,y,s);if( tu[x][y] == newColor)haColor =newColor;if(x >= 0 && x < 1024 && y >= 0 && y < 980 && (haColor == oldColor) && haColor != newColor){System.out.println("进来了");System.out.println("S x "+x+" y "+y+" "+newColor);setColor(x, y, g2d);floodFill8(x + 1, y,newColor, oldColor, g2d,s);floodFill8(x - 1, y,newColor, oldColor, g2d,s);floodFill8(x, y + 1, newColor, oldColor, g2d,s);floodFill8(x, y - 1, newColor, oldColor, g2d,s);// floodFill8(x + 1, y + 1, newColor, oldColor, g2d,s);// floodFill8(x - 1, y - 1, newColor, oldColor, g2d,s);// floodFill8(x - 1, y + 1, newColor, oldColor, g2d,s);// floodFill8(x + 1, y - 1, newColor, oldColor, g2d,s);}}int getpixel(int x,int y,Point a){//获得当前坐标颜色信息Robot rb = null; //java.awt.image包中的类，可以用来抓取屏幕，即截屏。

try {rb = new Robot();} catch (AWTException ex) {Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);}Toolkit tk = Toolkit.getDefaultToolkit(); //获取缺省工具包Dimension di = tk.getScreenSize(); //屏幕尺寸规格Rectangle rec = new Rectangle(0,0,di.width,di.height);BufferedImage bi = rb.createScreenCapture(rec);double a3 = a.getX();int a1= (int )a3;double a4 = a.getY();int a2 = (int)a4;int q=x+a1+8;int p = y+a2+83;Color pixelColor = rb.getPixelColor(q, p);int b1,b2,b3,b ;b1=pixelColor.getRed();b2=pixelColor.getGreen();b3=pixelColor.getBlue();b=b1+b2*1000+b3*1000000;return b;}int get(Color pixelColor){int b1,b2,b3,b ;b1=pixelColor.getRed();b2=pixelColor.getGreen();b3=pixelColor.getBlue();b=b1+b2*1000+b3*1000000;return b;}void draw(Graphics2D g2d,Point a) {//加鼠标事件i++;if(x2>0&&y2>0)tu =new int[1000][1000];System.out.println("ga "+i);if(x2>0){for(int i = 0;i<1000;i++)for(int j = 0;j <1000; j++){tu[i][j]=255255255;}System.out.println(" x1"+x1+" y1 "+y1+" x2 "+x2+" y2 " +y2);Color nColor= new Color(R,G,B);int newColor = get(nColor);System.out.println("Newqqq"+newColor);int oldColor;oldColor = getpixel(x1,y1,a);System.out.println("Oldqqq"+oldColor);int p;p= getpixel(200,200,a);System.out.println("pp"+p);System.out.println("p+"+p);floodFill8(x1,y1,newColor,oldColor,g2d,a);}}截图：9）选择颜色//选择当前颜色程序段public void chooseColor() {color = JColorChooser.showDialog(Main.this,"Choose a color", color);R = color.getRed();G = color.getGreen();B = color.getBlue();System.out.println("R"+R);itemList[index].R = R;itemList[index].G = G;itemList[index].B = B;}10）选择线条粗细//选择当前线条粗细程序段public void setStroke() {String input;input = JOptionPane.showInputDialog("Please input a float stroke value! ( >0 )");stroke = Float.parseFloat(input);itemList[index].stroke = stroke;}截图：五、总结此次实验采用的是Java语言，编写了能够绘制出了简单图形的界面和一些基本功能。