Исходный текст аплета LineDraw
Назад Вперед
Исходный текст аплета LieDrnaw вы найдете в листинге 1.
Листинг 1. Файл LieDrnaw.java
import java.applet.*; import java.awt.*; import java.util.*;
public class LineDraw extends Applet { Dimension dmDown; Dimension dmUp; Dimension dmPrev; boolean bDrawing; Vector lines;
public String getAppletInfo() { return "Name: LineDraw"; }
public void init() { bDrawing = false; lines = new Vector(); }
public void paint(Graphics g) { Dimension dimAppWndDimension = getSize();
setBackground(Color.yellow); g.setColor(Color.black); g.drawRect(0, 0, dimAppWndDimension.width - 1, dimAppWndDimension.height - 1);
for (int i=0; i < lines.size(); i++) { Rectangle p = (Rectangle)lines.elementAt(i); g.drawLine(p.width, p.height, p.x, p.y); g.drawString("<" + p.width + "," + p.height + ">", p.width, p.height); g.drawString("<" + p.x + "," + p.y+ ">", p.x, p.y); } bDrawing = false; }
public boolean mouseDown(Event evt, int x, int y) { if(evt.clickCount > 1) { lines.removeAllElements(); repaint(); return true; }
dmDown = new Dimension(x, y); dmPrev = new Dimension(x, y); bDrawing = false; return true; }
public boolean mouseUp(Event evt, int x, int y) { if(bDrawing) { dmUp = new Dimension(x, y); lines.addElement( new Rectangle(dmDown.width, dmDown.height, x, y)); repaint(); bDrawing = false; } return true; }
public boolean mouseDrag(Event evt, int x, int y) { Graphics g = getGraphics(); bDrawing = true;
g.setColor(Color.yellow); g.drawLine(dmDown.width, dmDown.height, dmPrev.width, dmPrev.height);
g.setColor(Color.black); g.drawLine(dmDown.width, dmDown.height, x, y);
dmPrev = new Dimension(x, y); return true; }
public boolean mouseMove(Event evt, int x, int y) { bDrawing = false; return true; } }
Исходный текст документа HTML, подготовленного системой JavaWorkshop, представлен в листинге 2.
Листинг 2. Файл LineDraw.tmp.html
<applet name="LineDraw" code="LineDraw" codebase= "file:/e:/Sun/Articles/vol5/src/LineDraw" width="500" height="600" align="Top" alt="If you had a java-enabled browser, you would see an applet here."> </applet>