Программирование на Java


Исходные тексты аплета Rectangles


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Исходные тексты аплета Rectangles приведены в листинге 1.

Листинг 1. Файл Rectangles,java

import java.applet.*; import java.awt.*;

public class Rectangles extends Applet { DrawRectangles m_DrawRectThread = null; DrawEllipse m_DrawEllipseThread = null; NotifyTask m_NotifyTaskThread = null

public String getAppletInfo() { return "Name: Rectangles"; }

public void paint(Graphics g) { Dimension dimAppWndDimension = getSize();

g.setColor(Color.yellow); g.fillRect(0, 0, dimAppWndDimension.width - 1, dimAppWndDimension.height - 1);

g.setColor(Color.black); g.drawRect(0, 0, dimAppWndDimension.width - 1, dimAppWndDimension.height - 1); }

public void start() { if (m_DrawRectThread == null) { m_DrawRectThread = new DrawRectangles(this); m_DrawRectThread.start(); }

if (m_DrawEllipseThread == null) { m_DrawEllipseThread = new DrawEllipse(this); m_DrawEllipseThread.start(); }

if (m_NotifyTaskThread == null) { m_NotifyTaskThread = new NotifyTask(m_DrawEllipseThread); m_NotifyTaskThread.start(); } }

public void stop() { if (m_DrawRectThread != null) { m_DrawRectThread.stop(); m_DrawRectThread = null; }

if (m_DrawEllipseThread == null) { m_DrawEllipseThread.stop(); m_DrawEllipseThread = null; }

if (m_NotifyTaskThread != null) { m_NotifyTaskThread.stop(); m_NotifyTaskThread = null; } } }

class DrawRectangles extends Thread { Graphics g; Dimension dimAppWndDimension;

public DrawRectangles(Applet Appl) { g = Appl.getGraphics(); dimAppWndDimension = Appl.getSize(); }

public void run() { while (true) { int x, y, width, height; int rColor, gColor, bColor;

x = (int)(dimAppWndDimension.width * Math.random()); y = (int)(dimAppWndDimension.height * Math.random()); width = (int)(dimAppWndDimension.width * Math.random()) / 2; height = (int)(dimAppWndDimension.height * Math.random()) / 2;

rColor = (int)(255 * Math.random()); gColor = (int)(255 * Math.random()); bColor = (int)(255 * Math.random());

g.setColor(new Color(rColor, gColor, bColor)); g.fillRect(x, y, width, height);




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