[b]GraphicsTest.java [/b]/* * @(#)GraphicsTest.java	1.10 99/08/04 * * Copyright (c) 1997, 1998 Sun Microsystems, Inc. All Rights Reserved. * * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use, * modify and redistribute this software in source and binary code form, * provided that i) this copyright notice and license appear on all copies of * the software; and ii) Licensee does not utilize the software in a manner * which is disparaging to Sun. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. * * This software is not designed or intended for use in on-line control of * aircraft, air traffic, aircraft navigation or aircraft communications; or in * the design, construction, operation or maintenance of any nuclear * facility. Licensee represents and warrants that it will not use or * redistribute the Software for such purposes. */import java.awt.*;import java.util.*;import java.awt.event.*;import java.applet.Applet;class GraphicsPanel extends Panel {    ActionListener al;    ItemListener il;    public GraphicsCards cards;     GraphicsPanel(EventListener listener) {         al = (ActionListener)listener;         il = (ItemListener)listener;        setLayout(new BorderLayout());        add("Center", cards = new GraphicsCards());        Panel p = new Panel();        //p.setLayout(new BorderLayout());        Button b = new Button("next");        b.addActionListener(al);        p.add(b);        b = new Button("previous");        b.addActionListener(al);        p.add(b);        p.add(new Label("go to:", Label.RIGHT));        Choice c = new Choice();        c.addItemListener(il);        p.add(c);        c.addItem("Arc");        c.addItem("Oval");        c.addItem("Polygon");        c.addItem("Rect");        c.addItem("RoundRect");        add("North", p);        setSize(400, 400);    }    public Dimension getPreferredSize() {        return new Dimension(200, 100);    }}public class GraphicsTest extends Appletimplements ActionListener, ItemListener {    GraphicsPanel mainPanel;    public void init() {        setLayout(new BorderLayout());        add("Center", mainPanel = new GraphicsPanel(this));    }    public void destroy() {        remove(mainPanel);    }    public void actionPerformed(ActionEvent e) {        String arg = e.getActionCommand();        if ("next".equals(arg)) {            ((CardLayout)mainPanel.cards.getLayout()).next(mainPanel.cards);        }        else if ("previous".equals(arg)) {            ((CardLayout)mainPanel.cards.getLayout()).previous(mainPanel.cards);        }    }    public void itemStateChanged(ItemEvent e) {        ((CardLayout)mainPanel.cards.getLayout()).show(mainPanel.cards,(String)e.getItem());    }    public static void main(String args[]) {        AppletFrame.startApplet("GraphicsTest", "Graphics Test", args);    }    public String getAppletInfo() {        return "An interactive demonstration of some graphics.";    }}   // end class GraphicsTestclass GraphicsCards extends Panel {    public GraphicsCards() {        setLayout(new CardLayout());        add("Arc", new ArcCard());        add("Oval", new ShapeTest( new OvalShape() ) );        add("Polygon", new ShapeTest( new PolygonShape() ) );        add("Rect", new ShapeTest( new RectShape() ) );        add("RoundRect", new ShapeTest( new RoundRectShape() ) );    }}   // end class GraphicsCardsclass ArcCard extends Panel {    public ArcCard() {        setLayout(new GridLayout(0, 2));        add(new ArcPanel(true));        add(new ArcPanel(false));        add(new ArcDegreePanel(true));        add(new ArcDegreePanel(false));    }}   // end class ArcCardclass ArcDegreePanel extends Panel {    boolean filled;    public ArcDegreePanel(boolean filled) {        this.filled = filled;    }    void arcSteps(Graphics g,                  int step,                  int x,                  int y,                  int w,                  int h,                  Color c1,                  Color c2) {    int a1 = 0;    int a2 = step;    int progress = 0;    g.setColor(c1);    for (; (a1+a2) <= 360; a1 = a1+a2, a2 += 1) {	if (g.getColor() == c1) {	    g.setColor(c2);        }	else {	    g.setColor(c1);        }	if (filled) {	    g.fillArc(x, y, w, h, a1, a2);        }	else {	    g.drawArc(x, y, w, h, a1, a2);        }	progress = a1+a2;      }  // end for    if (progress != 360) {          if (filled) {	    g.fillArc(x, y, w, h, a1, 360 - progress);	  }	else {	    g.drawArc(x, y, w, h, a1, 360 - progress);        }      }  // end if  }  // end arcSteps()    public void paint(Graphics g) {        Rectangle r = getBounds();        arcSteps(g, 3, 0, 0, r.width, r.height, Color.orange, Color.blue);        arcSteps(g,                 2,                 r.width / 4,                 r.height / 4,                 r.width / 2,                 r.height / 2,                 Color.yellow,                 Color.green);        arcSteps(g,                 1,                 (r.width  * 3) / 8,                 (r.height * 3) / 8,                 r.width / 4,                 r.height / 4,                 Color.magenta,                 Color.white);  }  // end paint()}   // end class ArcDegreePanelclass ArcPanel extends Panel {    boolean filled;    public ArcPanel(boolean filled) {    this.filled = filled;  }  public void paint(Graphics g)  {    Rectangle r = getBounds();    g.setColor(Color.yellow);    if (filled)      {	g.fillArc(0, 0, r.width, r.height, 0, 45);      }    else      {	g.drawArc(0, 0, r.width, r.height, 0, 45);      }    g.setColor(Color.green);    if (filled)      {	g.fillArc(0, 0, r.width, r.height, 90, -45);      }    else      {	g.drawArc(0, 0, r.width, r.height, 90, -45);      }    g.setColor(Color.orange);    if (filled)      {	g.fillArc(0, 0, r.width, r.height, 135, -45);      }    else      {	g.drawArc(0, 0, r.width, r.height, 135, -45);      }    g.setColor(Color.magenta);    if (filled)      {	g.fillArc(0, 0, r.width, r.height, -225, 45);      }    else      {	g.drawArc(0, 0, r.width, r.height, -225, 45);      }    g.setColor(Color.yellow);    if (filled)      {	g.fillArc(0, 0, r.width, r.height, 225, -45);      }    else      {	g.drawArc(0, 0, r.width, r.height, 225, -45);      }    g.setColor(Color.green);    if (filled)      {	g.fillArc(0, 0, r.width, r.height, -135, 45);      }    else      {	g.drawArc(0, 0, r.width, r.height, -135, 45);      }    g.setColor(Color.orange);    if (filled)      {	g.fillArc(0, 0, r.width, r.height, -45, -45);      }    else      {	g.drawArc(0, 0, r.width, r.height, -45, -45);      }    g.setColor(Color.magenta);    if (filled)      {	g.fillArc(0, 0, r.width, r.height, 315, 45);      }    else      {	g.drawArc(0, 0, r.width, r.height, 315, 45);      }  }  // end paint()}   // end class ArcPanelabstract class Shape{  abstract void draw(Graphics g, int x, int y, int w, int h);  abstract void fill(Graphics g, int x, int y, int w, int h);}class RectShape extends Shape{  void draw(Graphics g, int x, int y, int w, int h)  {    g.drawRect(x, y, w, h);  }  void fill(Graphics g, int x, int y, int w, int h)  {    g.fillRect(x, y, w, h);  }}class OvalShape extends Shape{  void draw(Graphics g, int x, int y, int w, int h)  {    g.drawOval(x, y, w, h);  }  void fill(Graphics g, int x, int y, int w, int h)  {    g.fillOval(x, y, w, h);  }}class RoundRectShape extends Shape{  void draw(Graphics g, int x, int y, int w, int h)  {    g.drawRoundRect(x, y, w, h, 10, 10);  }  void fill(Graphics g, int x, int y, int w, int h)  {    g.fillRoundRect(x, y, w, h, 10, 10);  }}class PolygonShape extends Shape{  // class variables  Polygon p;  Polygon pBase;  public PolygonShape()  {    pBase = new Polygon();    pBase.addPoint(0, 0);    pBase.addPoint(10, 0);    pBase.addPoint(5, 15);    pBase.addPoint(10, 20);    pBase.addPoint(5, 20);    pBase.addPoint(0, 10);    pBase.addPoint(0, 0);  }  void scalePolygon(float w, float h)  {    p = new Polygon();    for (int i = 0; i < pBase.npoints; ++i)      {	p.addPoint( (int) (pBase.xpoints[i] * w),		    (int) (pBase.ypoints[i] * h) );      }  }  void draw(Graphics g, int x, int y, int w, int h)  {    Graphics ng = g.create();    try {        ng.translate(x, y);	scalePolygon( (float) ( (float) w / (float) 10 ),		      (float) ( (float) h / (float) 20 ) );	ng.drawPolygon(p);    } finally {        ng.dispose();    }  }  void fill(Graphics g, int x, int y, int w, int h)  {    Graphics ng = g.create();    try {        ng.translate(x, y);	scalePolygon( (float) ( (float) w / (float) 10 ),		      (float) ( (float) h / (float) 20 ) );	ng.fillPolygon(p);    } finally {        ng.dispose();    }  }}class ShapeTest extends Panel{  Shape   shape;  int	    step;  public ShapeTest(Shape shape, int step)  {    this.shape = shape;    this.step = step;  }  public ShapeTest(Shape shape)  {    this(shape, 10);  }    public void paint(Graphics g) {        Rectangle bounds = getBounds();        int cx, cy, cw, ch;        Color color;        for (color=Color.red,                 cx=bounds.x,                 cy=bounds.y,                 cw=bounds.width / 2,                 ch=bounds.height;             cw > 0 && ch > 0;             cx+=step,                 cy += step,                 cw -= (step * 2),                 ch -= (step * 2),                 color=ColorUtils.darker(color, 0.9) ) {            g.setColor(color);            shape.draw(g, cx, cy, cw, ch);        }        for (cx=bounds.x + bounds.width / 2,                 cy=bounds.y,                 cw=bounds.width / 2, ch=bounds.height;             cw > 0 && ch > 0;             cx+=step,                 cy += step,                 cw -= (step * 2),                 ch -= (step * 2) ) {            if (g.getColor() == Color.red) {                g.setColor(Color.blue);            }            else {                g.setColor(Color.red);            }            shape.fill(g, cx, cy, cw, ch);        }  // end for    }  // end paint()}   // end class ShapeTestclass ColorUtils {    static Color brighter(Color c, double factor) {        return new Color( Math.min((int)(c.getRed()  *(1/factor)), 255),                          Math.min((int)(c.getGreen()*(1/factor)), 255),                          Math.min((int)(c.getBlue() *(1/factor)), 255) );    }    static Color darker(Color c, double factor) {        return new Color( Math.max((int)(c.getRed()  *factor), 0),                          Math.max((int)(c.getGreen()*factor), 0),                          Math.max((int)(c.getBlue() *factor), 0) );    }}                                  

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