Java Tutorial/2D Graphics/Clip
Содержание
A clipping area can also be created from a text string.
<source lang="java">
/*
* @(#)ClipImage.java 1.2 98/07/09
*
* Copyright (c) 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.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Rectangle; import java.awt.RenderingHints; import java.awt.Shape; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.font.FontRenderContext; import java.awt.font.TextLayout; import java.awt.geom.AffineTransform; import java.net.URL; import javax.swing.ImageIcon; import javax.swing.JApplet; import javax.swing.JFrame; import javax.swing.JPanel; public class Starry extends JApplet {
public void init() {
Image starry = new ImageIcon("yourFile.gif").getImage();
StarPanel starPanel = new StarPanel(starry);
getContentPane().add(starPanel, BorderLayout.CENTER);
}
protected URL getURL(String filename) {
URL codeBase = this.getCodeBase();
URL url = null;
try {
url = new URL(codeBase, filename);
} catch (java.net.MalformedURLException e) {
System.out.println("Couldn"t create image: " + "badly specified URL");
return null;
}
return url;
}
public static void main(String[] args) {
Image starry = new ImageIcon("yourFile.gif").getImage();
StarPanel starPanel = new StarPanel(starry);
JFrame f = new JFrame("Starry");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.getContentPane().add(starPanel, BorderLayout.CENTER);
f.setSize(new Dimension(550, 200));
f.setVisible(true);
}
} class StarPanel extends JPanel {
Image img;
int w, h;
public StarPanel(Image img) {
this.img = img;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
setBackground(Color.white);
w = getSize().width;
h = getSize().height;
Graphics2D g2;
g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
FontRenderContext frc = g2.getFontRenderContext();
Font f = new Font("Helvetica", 1, w / 10);
String s = new String("The Starry Night");
TextLayout textTl = new TextLayout(s, f, frc);
AffineTransform transform = new AffineTransform();
Shape outline = textTl.getOutline(null);
Rectangle r = outline.getBounds();
transform = g2.getTransform();
transform.translate(w / 2 - (r.width / 2), h / 2 + (r.height / 2));
g2.transform(transform);
g2.setColor(Color.blue);
g2.draw(outline);
g2.setClip(outline);
g2.drawImage(img, r.x, r.y, r.width, r.height, this);
}
}</source>
Animate a clipping path to reveal different portions of an image
<source lang="java">
/*
*
* Copyright (c) 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.BasicStroke; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import java.awt.geom.AffineTransform; import java.awt.geom.Arc2D; import java.awt.geom.Ellipse2D; import java.awt.geom.GeneralPath; import java.awt.geom.Rectangle2D; import java.awt.geom.RoundRectangle2D; import java.awt.image.BufferedImage; import java.net.URL; import javax.swing.ImageIcon; import javax.swing.JApplet; import javax.swing.JFrame; /**
* Animated clipping of an image & shapes with alpha. */
public class ClipImage extends JApplet implements Runnable {
private Image img;
private final double OINC[] = { 5.0, 3.0 };
private final double SINC[] = { 5.0, 5.0 };
private double x, y;
private double ix = OINC[0];
private double iy = OINC[1];
private double iw = SINC[0];
private double ih = SINC[1];
private double ew, eh; // ellipse width & height
private GeneralPath p = new GeneralPath();
private AffineTransform at = new AffineTransform();
private BasicStroke bs = new BasicStroke(20.0f);
private Arc2D arc = new Arc2D.Float();
private Ellipse2D ellipse = new Ellipse2D.Float();
private RoundRectangle2D roundRect = new RoundRectangle2D.Float();
private Rectangle2D rect = new Rectangle2D.Float();
private Color redBlend = new Color(255, 0, 0, 120);
private Color greenBlend = new Color(0, 255, 0, 120);
private Thread thread;
private BufferedImage offImg;
private int w, h;
private boolean newBufferedImage;
public void init() {
setBackground(Color.white);
img = new ImageIcon("yourFile.gif").getImage();
}
public void drawDemo(Graphics2D g2) {
if (newBufferedImage) {
x = Math.random() * w;
y = Math.random() * h;
ew = (Math.random() * w) / 2;
eh = (Math.random() * h) / 2;
}
x += ix;
y += iy;
ew += iw;
eh += ih;
if (ew > w / 2) {
ew = w / 2;
iw = Math.random() * -w / 16 - 1;
}
if (ew < w / 8) {
ew = w / 8;
iw = Math.random() * w / 16 + 1;
}
if (eh > h / 2) {
eh = h / 2;
ih = Math.random() * -h / 16 - 1;
}
if (eh < h / 8) {
eh = h / 8;
ih = Math.random() * h / 16 + 1;
}
if ((x + ew) > w) {
x = (w - ew) - 1;
ix = Math.random() * -w / 32 - 1;
}
if (x < 0) {
x = 2;
ix = Math.random() * w / 32 + 1;
}
if ((y + eh) > h) {
y = (h - eh) - 2;
iy = Math.random() * -h / 32 - 1;
}
if (y < 0) {
y = 2;
iy = Math.random() * h / 32 + 1;
}
ellipse.setFrame(x, y, ew, eh);
g2.setClip(ellipse);
rect.setRect(x + 5, y + 5, ew - 10, eh - 10);
g2.clip(rect);
g2.drawImage(img, 0, 0, w, h, this);
p.reset();
p.moveTo(-w / 2.0f, -h / 8.0f);
p.lineTo(+w / 2.0f, -h / 8.0f);
p.lineTo(-w / 4.0f, +h / 2.0f);
p.lineTo(+0.0f, -h / 2.0f);
p.lineTo(+w / 4.0f, +h / 2.0f);
p.closePath();
at.setToIdentity();
at.translate(w * .5f, h * .5f);
g2.transform(at);
g2.setStroke(bs);
g2.setPaint(redBlend);
g2.draw(p);
at.setToIdentity();
g2.setTransform(at);
g2.setPaint(greenBlend);
for (int yy = 0; yy < h; yy += 50) {
for (int xx = 0, i = 0; xx < w; i++, xx += 50) {
switch (i) {
case 0:
arc.setArc(xx, yy, 25, 25, 45, 270, Arc2D.PIE);
g2.fill(arc);
break;
case 1:
ellipse.setFrame(xx, yy, 25, 25);
g2.fill(ellipse);
break;
case 2:
roundRect.setRoundRect(xx, yy, 25, 25, 4, 4);
g2.fill(roundRect);
break;
case 3:
rect.setRect(xx, yy, 25, 25);
g2.fill(rect);
i = -1;
}
}
}
}
public Graphics2D createDemoGraphics2D(Graphics g) {
Graphics2D g2 = null;
if (offImg == null || offImg.getWidth() != w || offImg.getHeight() != h) {
offImg = (BufferedImage) createImage(w, h);
newBufferedImage = true;
}
if (offImg != null) {
g2 = offImg.createGraphics();
g2.setBackground(getBackground());
}
// .. set attributes ..
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
// .. clear canvas ..
g2.clearRect(0, 0, w, h);
return g2;
}
public void paint(Graphics g) {
w = getWidth();
h = getHeight();
if (w <= 0 || h <= 0)
return;
Graphics2D g2 = createDemoGraphics2D(g);
drawDemo(g2);
g2.dispose();
if (offImg != null && isShowing()) {
g.drawImage(offImg, 0, 0, this);
}
newBufferedImage = false;
}
public void start() {
thread = new Thread(this);
thread.start();
}
public synchronized void stop() {
thread = null;
}
public void run() {
Thread me = Thread.currentThread();
while (thread == me && isShowing()) {
Graphics g = getGraphics();
paint(g);
g.dispose();
thread.yield();
}
thread = null;
}
protected URL getURL(String filename) {
URL codeBase = this.getCodeBase();
URL url = null;
try {
url = new URL(codeBase, filename);
} catch (java.net.MalformedURLException e) {
System.out.println("Couldn"t create image: " + "badly specified URL");
return null;
}
return url;
}
public static void main(String s[]) {
final ClipImage demo = new ClipImage();
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
public void windowDeiconified(WindowEvent e) {
demo.start();
}
public void windowIconified(WindowEvent e) {
demo.stop();
}
};
JFrame f = new JFrame("Java 2D Demo - ClipImage");
f.addWindowListener(l);
f.getContentPane().add("Center", demo);
f.setSize(new Dimension(400, 300));
f.show();
demo.start();
}
}</source>
Clip between Rectangle and Ellipse2D
<source lang="java">
import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.geom.Ellipse2D; import javax.swing.JFrame; import javax.swing.JPanel; public class ClipBetweenRectangleEllipse2D extends JFrame {
public ClipBetweenRectangleEllipse2D() {
getContentPane().add(new DrawingCanvas());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500, 500);
setVisible(true);
}
public static void main(String arg[]) {
new ClipBetweenRectangleEllipse2D();
}
} class DrawingCanvas extends JPanel {
DrawingCanvas() {
setSize(300, 300);
setBackground(Color.white);
}
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
Graphics2D g2 = (Graphics2D) g;
int w = getSize().width;
int h = getSize().height;
Ellipse2D e = new Ellipse2D.Float(w / 4.0f, h / 4.0f, w / 2.0f, h / 2.0f);
g2.setClip(e);
g2.setColor(Color.red);
g2.fillRect(0, 0, w, h);
Rectangle r = new Rectangle(w/2, h/2, w/2, h/2);
g2.clip(r);
g2.setColor(Color.green);
g2.fillRect(0, 0, w, h);
}
}</source>
Clip Demo
<source lang="java">
import java.awt.Frame; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Ellipse2D; public class MainClass extends Frame {
public static void main(String[] args) {
(new MainClass()).setVisible(true);
}
public MainClass() {
setSize(250, 250);
}
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
Ellipse2D e = new Ellipse2D.Float(10, 10, 200, 200);
g2d.clip(e);
g2d.fillRect(40, 60, 500, 500);
}
}</source>
Clipping is restricting of drawing to a certain area.
<source lang="java">
import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.geom.Ellipse2D; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.Timer; public class Clipping extends JPanel implements ActionListener {
int x = 8, y = 8, radius = 90;
Timer timer;
Image image = new ImageIcon("yourImage.png").getImage();
double delta[] = { 3, 3 };
public Clipping() {
timer = new Timer(15, this);
timer.start();
}
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setClip(new Ellipse2D.Double(x, y, radius, radius));
g2d.drawImage(image, 5, 5, null);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.add(new Clipping());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 400);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
int w = 400;
int h = 400;
if (x < 0) {
delta[0] = Math.random() % 4 + 5;
} else if (x > w - radius) {
delta[0] = -(Math.random() % 4 + 5);
}
if (y < 0) {
delta[1] = Math.random() % 4 + 5;
} else if (y > h - radius) {
delta[1] = -(Math.random() % 4 + 5);
}
x += delta[0];
y += delta[1];
repaint();
}
}</source>
Setting the Clipping Area with a Shape
<source lang="java">
import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Shape; import javax.swing.ImageIcon; import javax.swing.JComponent; import javax.swing.JFrame; public class BasicDraw {
public static void main(String[] args) {
new BasicDraw();
}
BasicDraw() {
JFrame frame = new JFrame();
frame.add(new MyComponent());
frame.setSize(300, 300);
frame.setVisible(true);
}
} class MyComponent extends JComponent {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
Shape shape = new java.awt.geom.Ellipse2D.Float(20, 20, 200,200);
g2d.setClip(shape);
int x = 0;
int y = 0;
g2d.drawImage(new ImageIcon("a.png").getImage(), x, y, this);
}
}</source>
