基于java使用DDA、Bresenham算法、中点画圆和椭圆、来实可视化界面画线功能

package DrawShape; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Combo; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text;; public class MainFrame { private int a1,a2,b1,b2,state;//画线时的两个点的横纵坐标； private int r,a,b,x,y;//x y是中点坐标，r是圆的半径，a是长轴，b是短轴； public static int c = 0; public MainFrame() { final Display display = Display.getDefault(); final Shell shell = new Shell(); shell.setSize(400,300); shell.setLocation(300,100); shell.setText("图形学作业"); final Label label1 = new Label(shell,SWT.NONE); final Label label2 = new Label(shell,SWT.NONE); final Label label3 = new Label(shell,SWT.NONE); final Label label4 = new Label(shell,SWT.NONE); final Label label5 = new Label(shell,SWT.NONE); final Label label6 = new Label(shell,SWT.NONE); final Label label7 = new Label(shell,SWT.NONE); final Label label8 = new Label(shell,SWT.NONE); final Button button1 = new Button(shell,SWT.NONE); final Text text1 = new Text(shell,SWT.BORDER); final Text text2 = new Text(shell,SWT.BORDER); final Text text3 = new Text(shell,SWT.BORDER); final Text text4 = new Text(shell,SWT.BORDER); final Text text5 = new Text(shell,SWT.BORDER); final Text text6 = new Text(shell,SWT.BORDER); final Text text7 = new Text(shell,SWT.BORDER); final Text text8 = new Text(shell,SWT.BORDER); final Text text9 = new Text(shell,SWT.BORDER); final Combo combo1 = new Combo(shell,SWT.DROP_DOWN); //label1初始化 label1.setBounds(40,50,100,15); //label1.setLocation(20,30); label1.setText("请选择算法"); //label2 初始化 label2.setBounds(220,50,150,15); label2.setText("请输出A点与B点坐标"); //label3 初始化 label3.setBounds(220,90,30,15); label3.setText("A"); //label4 初始化 label4.setBounds(220,117,30,15); label4.setText("B"); //label5初始化 label5.setBounds(220,140,30,15); label5.setText("圆心"); //label6初始化 label6.setBounds(320,140,25,15); label6.setText("半径"); //label7初始化 label7.setBounds(220,170,30,15); label7.setText("长轴"); //label8初始化 label8.setBounds(285,170,30,15); label8.setText("短轴"); //button1的初始 button1.setText("开始绘制"); button1.setBackground(display.getSystemColor(SWT.COLOR_BLUE)); button1.setBounds(170,200,60,40); button1.addSelectionListener(new SelectionListener() { @Override public void widgetSelected(SelectionEvent e) { final Shell shell1 = new Shell(shell,SWT.NO_TRIM); shell1.setSize(600,600); shell1.setLocation(700,40); shell1.setText("图像"); shell1.setLayout(new FillLayout()); shell1.open(); thePoint [] p; GC g = new GC(shell1); g.setForeground(display.getSystemColor(SWT.COLOR_BLUE)); g.setBackground(display.getSystemColor(SWT.COLOR_BLACK)); //画坐标线 g.fillRectangle(0, 0, 600,600); g.drawLine(0, 300, 600, 300); g.drawLine(300, 0, 300, 600); //开始四种画线方法： g.setForeground(display.getSystemColor(SWT.COLOR_WHITE)); if (state == 1) { p = GCUtil.DDAMethod(a1, a2, b1, b2); for(int i = 0; i <c; i++) { g.drawPoint(p[i].getThePointX() + 300, 300 - p[i].getThePointY()); try { Thread.sleep(10); } catch (InterruptedException e1) { e1.printStackTrace(); } } }else if(state == 2) { p = GCUtil.BMethod(a1, a2, b1, b2); for(int i = 0; i <c; i++) { g.drawPoint(p[i].getThePointX() + 300, 300 - p[i].getThePointY()); try { Thread.sleep(10); } catch (InterruptedException e1) { e1.printStackTrace(); } } }else if(state == 3) { p = GCUtil.CirMethod(r); // int x=100; // int y =80; for(int i = 0; i <c; i++) { g.drawPoint(p[i].getThePointX() + 300 + x, 300 - p[i].getThePointY() - y); g.drawPoint(p[i].getThePointY() + 300 + x, 300 - p[i].getThePointX() - y); g.drawPoint(-(p[i].getThePointX()) + 300 + x, 300 - p[i].getThePointY() - y); g.drawPoint(-(p[i].getThePointY()) + 300 + x, 300 - p[i].getThePointX() - y); g.drawPoint(p[i].getThePointY() + 300 + x, 300 + p[i].getThePointX() - y); g.drawPoint(300 + p[i].getThePointX() + x, p[i].getThePointY() + 300 - y); g.drawPoint(-(p[i].getThePointX()) + 300 + x, 300 + p[i].getThePointY() - y); g.drawPoint(300 - p[i].getThePointY() + x, p[i].getThePointX() + 300 - y); try { Thread.sleep(10); } catch (InterruptedException e1) { e1.printStackTrace(); } } }else if(state == 4) { p = GCUtil.ELMethod(a,b); for(int i = 0; i <c; i++) { g.drawPoint(p[i].getThePointX() + 300 + x, 300 - p[i].getThePointY() - y); g.drawPoint(p[i].getThePointX() + 300 + x, 300 + p[i].getThePointY() - y); g.drawPoint(-(p[i].getThePointX()) + 300 + x, 300 + p[i].getThePointY() -y); g.drawPoint(-(p[i].getThePointX()) + 300 + x, 300 - p[i].getThePointY() - y); try { Thread.sleep(10); } catch (InterruptedException e1) { e1.printStackTrace(); } } } g.dispose(); //System.out.println(state); shell1.layout(); while (!shell.isDisposed()) { if(!display.readAndDispatch()) display.sleep(); } } @Override public void widgetDefaultSelected(SelectionEvent arg0) { // TODO Auto-generated method stub } }); //text的初始化 text1.setBounds(250,90,30,20); text1.setBackground(display.getSystemColor(SWT.COLOR_GREEN)); text1.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { // TODO Auto-generated method stub if(text1.getText() != "") a1 = Integer.parseInt(text1.getText()); else a1 = 0; //System.out.println("a1= " + a1); } }); text2.setBounds(320,90,30,20); text2.setBackground(display.getSystemColor(SWT.COLOR_GREEN)); text2.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { // TODO Auto-generated method stub if(text2.getText() != "") a2 = Integer.parseInt(text2.getText()); else a2 = 0; //System.out.println("a2= " + a2); } }); text3.setBounds(250,117,30,20); text3.setBackground(display.getSystemColor(SWT.COLOR_GREEN)); text3.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { // TODO Auto-generated method stub if(text3.getText() != "") b1 = Integer.parseInt(text3.getText()); else b1 = 0; //System.out.println("b1= " + b1); } }); text4.setBounds(320,117,30,20); text4.setBackground(display.getSystemColor(SWT.COLOR_GREEN)); text4.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { // TODO Auto-generated method stub if(text4.getText() != "") b2 = Integer.parseInt(text4.getText()); else b2 = 0; //System.out.println("b2= " + b2); } }); text5.setBounds(250,140,30,20); text5.setBackground(display.getSystemColor(SWT.COLOR_GREEN)); text5.addModifyListener(new ModifyListener() { @Override public void mod