Java Tutorial/2D Graphics/TextLayout
Содержание
Drawing a Paragraph of Text
<source lang="java">
import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.font.LineBreakMeasurer; import java.awt.font.TextLayout; import java.text.AttributedString; import javax.swing.JFrame; import javax.swing.JPanel; public class BasicShapes extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
drawParagraph(g2d, "adfasdfaf", 20);
}
void drawParagraph(Graphics2D g, String paragraph, float width) {
LineBreakMeasurer linebreaker = new LineBreakMeasurer(new AttributedString(paragraph)
.getIterator(), g.getFontRenderContext());
float y = 0.0f;
while (linebreaker.getPosition() < paragraph.length()) {
TextLayout tl = linebreaker.nextLayout(width);
y += tl.getAscent();
tl.draw(g, 0, y);
y += tl.getDescent() + tl.getLeading();
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Basic Shapes");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new BasicShapes());
frame.setSize(350, 250);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}</source>
Drawing Text with Mixed Styles
<source lang="java">
import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.font.TextAttribute; import java.awt.font.TextLayout; import java.text.AttributedString; import javax.swing.JFrame; import javax.swing.JPanel; public class BasicShapes extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
int x = 10, y = 10, start = 2, end = 4;
AttributedString astr = new AttributedString("aString");
astr.addAttribute(TextAttribute.FONT, new Font("", 1, 1), start, end);
astr.addAttribute(TextAttribute.BACKGROUND, Color.red, start, end);
// Draw mixed-style text
TextLayout tl = new TextLayout(astr.getIterator(), g2d.getFontRenderContext());
tl.draw(g2d, x, y);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Basic Shapes");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new BasicShapes());
frame.setSize(350, 250);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}</source>
Draw text with TextLayout
<source lang="java">
import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.font.FontRenderContext; import java.awt.font.TextLayout; import javax.swing.JFrame; import javax.swing.JPanel; public class Main extends JPanel {
public Main() {
setBackground(Color.white);
}
public void paint(Graphics g) {
Graphics2D g2D;
g2D = (Graphics2D) g;
g2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2D.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
FontRenderContext frc = g2D.getFontRenderContext();
Font font1 = new Font("Courier", Font.BOLD, 24);
String str1 = new String("Java");
TextLayout tl = new TextLayout(str1, font1, frc);
g2D.setColor(Color.gray);
tl.draw(g2D, 50, 150);
}
public static void main(String s[]) {
JFrame frame1 = new JFrame("2D Text");
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame1.getContentPane().add("Center", new Main());
frame1.pack();
frame1.setSize(new Dimension(500, 300));
frame1.setVisible(true);
}
}</source>
Getting the Shape from the Outline of Text
<source lang="java">
import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Shape; import java.awt.font.FontRenderContext; import java.awt.font.TextLayout; import javax.swing.JFrame; import javax.swing.JPanel; public class BasicShapes extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
getTextShape(g2d, "asdf", new Font("", 1, 1));
}
public Shape getTextShape(Graphics2D g2d, String str, Font font) {
FontRenderContext frc = g2d.getFontRenderContext();
TextLayout tl = new TextLayout(str, font, frc);
return tl.getOutline(null);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Basic Shapes");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new BasicShapes());
frame.setSize(350, 250);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}</source>
Make your own animation from a series of images
<source lang="java">
import java.awt.BorderLayout; import java.awt.Graphics; import java.awt.MediaTracker; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.Timer; public class Main extends JPanel implements ActionListener {
ImageIcon images[];
int totalImages = 30, currentImage = 0, animationDelay = 50;
Timer animationTimer;
public Main() {
images = new ImageIcon[totalImages];
for (int i = 0; i < images.length; ++i)
images[i] = new ImageIcon("images/java" + i + ".gif");
startAnimation();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (images[currentImage].getImageLoadStatus() == MediaTracker.ruPLETE) {
images[currentImage].paintIcon(this, g, 0, 0);
currentImage = (currentImage + 1) % totalImages;
}
}
public void actionPerformed(ActionEvent e) {
repaint();
}
public void startAnimation() {
if (animationTimer == null) {
currentImage = 0;
animationTimer = new Timer(animationDelay, this);
animationTimer.start();
} else if (!animationTimer.isRunning())
animationTimer.restart();
}
public void stopAnimation() {
animationTimer.stop();
}
public static void main(String args[]) {
Main anim = new Main();
JFrame app = new JFrame("Animator test");
app.add(anim, BorderLayout.CENTER);
app.setSize(300,300);
app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
app.setSize(anim.getPreferredSize().width + 10, anim.getPreferredSize().height + 30);
}
}</source>
Styled Text
<source lang="java">
import java.awt.Canvas; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.font.FontRenderContext; import java.awt.font.TextLayout; import javax.swing.JFrame; public class Draw2DTextLayout extends JFrame {
public static void main(String args[]) {
Draw2DTextLayout app = new Draw2DTextLayout();
}
public Draw2DTextLayout() {
add("Center", new MyCanvas());
setSize(400, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
class MyCanvas extends Canvas {
public void paint(Graphics graphics) {
Graphics2D g = (Graphics2D) graphics;
FontRenderContext frc = g.getFontRenderContext();
TextLayout[] s = new TextLayout[3];
Font f1 = new Font("Helvetica", Font.BOLD, 24);
Font f2 = new Font("TimesRoman", Font.ITALIC, 14);
Font f3 = new Font("Helvetica", Font.PLAIN, 12);
s[0] = new TextLayout("This is the first sentence.", f1, frc);
s[1] = new TextLayout("This is the second sentence.", f2, frc);
s[2] = new TextLayout("This is the third sentence.", f3, frc);
int yOffset = 0;
for (int i = 0; i < s.length; ++i) {
s[i].draw(g, 100, 100 + yOffset);
yOffset += s[i].getAscent() + s[i].getDescent() + s[i].getLeading();
}
}
}
}</source>
Text Layout with mouse clicking and selecting action
<source lang="java">
import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Shape; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import java.awt.font.FontRenderContext; import java.awt.font.TextHitInfo; import java.awt.font.TextLayout; import java.awt.geom.AffineTransform; import java.awt.geom.Rectangle2D; import javax.swing.JFrame; import javax.swing.JPanel; public class TextLayoutWithMouseClickDrag{
public static void main(String arg[]) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add("Center", new DisplayPanel());
frame.pack();
frame.setSize(new Dimension(400, 300));
frame.setVisible(true);
}
} class DisplayPanel extends JPanel {
FontRenderContext frc = new FontRenderContext(null, false, false);
Font font = new Font("Arial", Font.PLAIN, 36);
Rectangle2D rect;
float rx, ry, rw, rh;
TextHitInfo hitInfo;
Color caretColor;
int hit1, hit2;
int w=400, h=200;
TextLayout layout = new TextLayout("j a v a 2 s . c o m", font, frc);
public DisplayPanel() {
setSize(400, 200);
addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseMotionHandler());
rx = (float) (w / 2 - layout.getBounds().getWidth() / 2);
ry = (float) 3 * h / 4;
rw = (float) (layout.getBounds().getWidth());
rh = (float) (layout.getBounds().getHeight());
rect = new Rectangle2D.Float(rx, ry, rw, rh);
}
public void update(Graphics g) {
g.clearRect(0, 0, getWidth(), getHeight());
paintComponent(g);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
AffineTransform at = AffineTransform.getTranslateInstance(rx, ry);
Shape hilight = layout.getLogicalHighlightShape(hit1, hit2);
hilight = at.createTransformedShape(hilight);
g2.setColor(Color.lightGray);
g2.fill(hilight);
g2.setColor(Color.black);
layout.draw(g2, rx, ry);
Shape[] caretShapes = layout.getCaretShapes(hit1);
Shape caret = at.createTransformedShape(caretShapes[0]);
g2.setColor(caretColor);
g2.draw(caret);
}
public int getHitLocation(int mouseX, int mouseY) {
hitInfo = layout.hitTestChar(mouseX, mouseY, rect);
return hitInfo.getInsertionIndex();
}
class MouseHandler extends MouseAdapter {
public void mouseClicked(MouseEvent e) {
caretColor = getForeground();
hit1 = getHitLocation(e.getX(), e.getY());
hit2 = hit1;
repaint();
}
public void mousePressed(MouseEvent e) {
caretColor = getForeground();
hit1 = getHitLocation(e.getX(), e.getY());
hit2 = hit1;
repaint();
}
public void mouseReleased(MouseEvent e) {
hit2 = getHitLocation(e.getX(), e.getY());
repaint();
}
}
class MouseMotionHandler extends MouseMotionAdapter {
public void mouseDragged(MouseEvent e) {
caretColor = getBackground();
hit2 = getHitLocation(e.getX(), e.getY());
repaint();
}
}
}</source>
