Java example source code file (GraphicsTest.java)
The GraphicsTest.java Java example source code
/*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import java.applet.Applet;
@SuppressWarnings("serial")
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);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 100);
}
}
@SuppressWarnings("serial")
public class GraphicsTest extends Applet
implements ActionListener, ItemListener {
GraphicsPanel mainPanel;
@Override
public void init() {
setLayout(new BorderLayout());
add("Center", mainPanel = new GraphicsPanel(this));
}
@Override
public void destroy() {
remove(mainPanel);
}
@Override
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);
}
}
@Override
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);
}
@Override
public String getAppletInfo() {
return "An interactive demonstration of some graphics.";
}
} // end class GraphicsTest
@SuppressWarnings("serial")
class 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 GraphicsCards
@SuppressWarnings("serial")
class 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 ArcCard
@SuppressWarnings("serial")
class 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()
@Override
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 ArcDegreePanel
@SuppressWarnings("serial")
class ArcPanel extends Panel {
boolean filled;
public ArcPanel(boolean filled) {
this.filled = filled;
}
@Override
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 ArcPanel
abstract 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 {
@Override
void draw(Graphics g, int x, int y, int w, int h) {
g.drawRect(x, y, w, h);
}
@Override
void fill(Graphics g, int x, int y, int w, int h) {
g.fillRect(x, y, w, h);
}
}
class OvalShape extends Shape {
@Override
void draw(Graphics g, int x, int y, int w, int h) {
g.drawOval(x, y, w, h);
}
@Override
void fill(Graphics g, int x, int y, int w, int h) {
g.fillOval(x, y, w, h);
}
}
class RoundRectShape extends Shape {
@Override
void draw(Graphics g, int x, int y, int w, int h) {
g.drawRoundRect(x, y, w, h, 10, 10);
}
@Override
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));
}
}
@Override
void draw(Graphics g, int x, int y, int w, int h) {
Graphics ng = g.create();
try {
ng.translate(x, y);
scalePolygon(((float) w / 10f), ((float) h / 20f));
ng.drawPolygon(p);
} finally {
ng.dispose();
}
}
@Override
void fill(Graphics g, int x, int y, int w, int h) {
Graphics ng = g.create();
try {
ng.translate(x, y);
scalePolygon(((float) w / 10f), ((float) h / 20f));
ng.fillPolygon(p);
} finally {
ng.dispose();
}
}
}
@SuppressWarnings("serial")
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);
}
@Override
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 ShapeTest
class 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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