这是Slider GUI:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.Timer;
public SliderGui(){
}
public void initGUI() {
JFrame frame = new JFrame("Slider");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setPreferredSize(new Dimension(F_WIDTH, F_HEIGHT));
frame.setLayout(new BorderLayout());
CarIcon initI = new CarIcon(DEFAULT_SIZE);
this.imagePan = new JLabel(initI);
frame.add(imagePan, BorderLayout.CENTER);
this.setSlider(frame);
}
public void setSlider(JFrame frame) {
JSlider sizeSlider = new JSlider(JSlider.VERTICAL, MIN_SIZE,
MAX_SIZE, DEFAULT_SIZE);
sizeSlider.setMajorTickSpacing(10);
sizeSlider.setMinorTickSpacing(5);
sizeSlider.setPaintTicks(true);
sizeSlider.setPaintLabels(true);
sizeSlider.addChangeListener((ChangeEvent e) -> {
JSlider source = (JSlider)e.getSource();
if (!source.getValueIsAdjusting()) {
int level = (int)source.getValue();
this.icon.setWidth(level);
this.icon.paintIcon(imagePan, this.g, x, y);
}
});
frame.add(sizeSlider, BorderLayout.WEST);
}
public static void main(String[] args) {
SliderGui test = new SliderGui();
test.initGUI();
}
public CarIcon icon;
public Graphics2D g;
private JLabel imagePan;
static final int x = 350;
static final int y = 350;
static final int F_WIDTH = 700;
static final int F_HEIGHT = 700;
static final int MAX_SIZE = 200;
static final int MIN_SIZE = 5;
static final int DEFAULT_SIZE = 75;
}
这是CarIcon课程:
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class CarIcon implements Icon
{
public CarIcon(int aWidth)
{
width = aWidth;
}
public void setWidth(int aWidth) {
this.width = aWidth;
}
public int getIconWidth()
{
return width;
}
public int getIconHeight()
{
return width / 2;
}
public void paintIcon(Component c, Graphics g, int x, int y)
{
Graphics2D g2 = (Graphics2D) g;
Rectangle2D.Double body
= new Rectangle2D.Double(x, y + width / 6,
width - 1, width / 6);
Ellipse2D.Double frontTire
= new Ellipse2D.Double(x + width / 6, y + width / 3,
width / 6, width / 6);
Ellipse2D.Double rearTire
= new Ellipse2D.Double(x + width * 2 / 3, y + width / 3,
width / 6, width / 6);
// The bottom of the front windshield
Point2D.Double r1
= new Point2D.Double(x + width / 6, y + width / 6);
// The front of the roof
Point2D.Double r2
= new Point2D.Double(x + width / 3, y);
// The rear of the roof
Point2D.Double r3
= new Point2D.Double(x + width * 2 / 3, y);
// The bottom of the rear windshield
Point2D.Double r4
= new Point2D.Double(x + width * 5 / 6, y + width / 6);
Line2D.Double frontWindshield
= new Line2D.Double(r1, r2);
Line2D.Double roofTop
= new Line2D.Double(r2, r3);
Line2D.Double rearWindshield
= new Line2D.Double(r3, r4);
g2.fill(frontTire);
g2.fill(rearTire);
g2.setColor(Color.red);
g2.fill(body);
g2.draw(frontWindshield);
g2.draw(roofTop);
g2.draw(rearWindshield);
}
private int width;
}
答案 0 :(得分:3)
问题:
paintIcon(...)
直接绘制图标。让Java本身做到这一点。相反,只需在更改图标宽度后调用保存图标的JLabel上的repaint()
- 就是这样!这是我测试它的方式:
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
@SuppressWarnings("serial")
public class ResizeIcon extends JPanel {
private static final int PREF_W = 800;
private static final int PREF_H = 650;
private static final int MAX_ICON_WIDTH = 400;
private int iconWidth = MAX_ICON_WIDTH / 2;
private CarIcon carIcon = new CarIcon(iconWidth);
private JLabel carLabel = new JLabel(carIcon);
private JSlider slider = new JSlider(0, MAX_ICON_WIDTH, iconWidth);
public ResizeIcon() {
slider.setMajorTickSpacing(50);
slider.setMinorTickSpacing(10);
slider.setPaintLabels(true);
slider.setPaintTicks(true);
slider.setPaintTrack(true);
slider.setSnapToTicks(true);
slider.addChangeListener(new SliderListener());
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
setLayout(new BorderLayout());
add(slider, BorderLayout.PAGE_START);
add(carLabel, BorderLayout.CENTER);
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private class SliderListener implements ChangeListener {
@Override
public void stateChanged(ChangeEvent e) {
int value = slider.getValue();
carIcon.setWidth(value);
carLabel.repaint();
}
}
private static void createAndShowGui() {
ResizeIcon mainPanel = new ResizeIcon();
JFrame frame = new JFrame("Resize Icon");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
class CarIcon implements Icon {
public CarIcon(int aWidth) {
width = aWidth;
}
public void setWidth(int aWidth) {
this.width = aWidth;
}
public int getIconWidth() {
return width;
}
public int getIconHeight() {
return width / 2;
}
public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D) g;
Rectangle2D.Double body = new Rectangle2D.Double(x, y + width / 6, width - 1, width / 6);
Ellipse2D.Double frontTire = new Ellipse2D.Double(x + width / 6, y + width / 3, width / 6,
width / 6);
Ellipse2D.Double rearTire = new Ellipse2D.Double(x + width * 2 / 3, y + width / 3,
width / 6, width / 6);
// The bottom of the front windshield
Point2D.Double r1 = new Point2D.Double(x + width / 6, y + width / 6);
// The front of the roof
Point2D.Double r2 = new Point2D.Double(x + width / 3, y);
// The rear of the roof
Point2D.Double r3 = new Point2D.Double(x + width * 2 / 3, y);
// The bottom of the rear windshield
Point2D.Double r4 = new Point2D.Double(x + width * 5 / 6, y + width / 6);
Line2D.Double frontWindshield = new Line2D.Double(r1, r2);
Line2D.Double roofTop = new Line2D.Double(r2, r3);
Line2D.Double rearWindshield = new Line2D.Double(r3, r4);
g2.fill(frontTire);
g2.fill(rearTire);
g2.setColor(Color.red);
g2.fill(body);
g2.draw(frontWindshield);
g2.draw(roofTop);
g2.draw(rearWindshield);
}
private int width;
}