我的GUI应该显示一个简笔画，你可以改变它的大小和颜色。我的所有按钮都显示在我的框架中，但棒图不是。请帮忙 以下是我的所有代码
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.awt.geom.Line2D;
import java.awt.Polygon;
import java.awt.BasicStroke;
public class StickFigure
{
public StickFigure(int xIn, int yIn, int wIn, int hIn)
{
width = (int)(wIn*scale);
height = (int)(hIn*scale);
x = xIn;
y = yIn;
scale = 1;
color = Color.BLACK;
}
public void draw(Graphics2D g2)
{
Ellipse2D.Double head = new Ellipse2D.Double((width/4)+x, y, width/2, width/2);
Point2D bodyPoint1 = new Point2D.Double((int)((width/2)+x), (int)((height/5)+y));
Point2D bodyPoint2 = new Point2D.Double((int)((width/2)+x), (int)(4*(height/5)+y));
Line2D body = new Line2D.Double(bodyPoint1,bodyPoint2);
Point2D leftArmPoint1 = new Point2D.Double((int)((width/2)+x), (int)(1.5*(height/5)+y));
Point2D leftArmPoint2 = new Point2D.Double(x, (int)(2.5*(height/5)+y));
Point2D leftArmPoint3 = new Point2D.Double((int)((width/2)+x), (int)(2.5*(height/5)+y));
Line2D leftArmLine1 = new Line2D.Double(leftArmPoint1, leftArmPoint2);
Line2D leftArmLine2 = new Line2D.Double(leftArmPoint2, leftArmPoint3);
Point2D rightArmPoint1 = new Point2D.Double((int)((width/2)+x), (int)(1.5*(height/5)+y));
Point2D rightArmPoint2 = new Point2D.Double(width + x, (int)(2.5*(height/5)+y));
Point2D rightArmPoint3 = new Point2D.Double((int)((width/2)+x), (int)(2.5*(height/5)+y));
Line2D rightArmLine1 = new Line2D.Double(rightArmPoint1, rightArmPoint2);
Line2D rightArmLine2 = new Line2D.Double(rightArmPoint2, rightArmPoint3);
Point2D leftLegPoint = new Point2D.Double(x, height + y);
Point2D rightLegPoint = new Point2D.Double(width + x, height+y);
Line2D leftLeg = new Line2D.Double(bodyPoint2, leftLegPoint);
Line2D rightLeg = new Line2D.Double(bodyPoint2, rightLegPoint);
g2.setStroke( new BasicStroke(5.0f));
g2.setColor(color);
g2.fill(head);
g2.fill(body);
g2.fill(leftArmLine1);
g2.fill(leftArmLine2);
g2.fill(rightArmLine1);
g2.fill(rightArmLine2);
g2.fill(leftLeg);
g2.fill(rightLeg);
g2.draw(head);
g2.draw(body);
g2.draw(leftArmLine1);
g2.draw(leftArmLine2);
g2.draw(rightArmLine1);
g2.draw(rightArmLine2);
g2.draw(leftLeg);
g2.draw(rightLeg);
}
public void changeColorOfStickFigure(Color cIn)
{
color = cIn;
}
public void changeSizeOfStickFigure(int sIn)
{
scale = sIn;
}
private Color color;
private int width;
private int height;
private int scale;
private int x;
private int y;
}
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;
import java.awt.Dimension;
public class StickFigureComponent extends JComponent
{
public StickFigureComponent()
{
stickFigure1 = new StickFigure(STICKFIGURE_X, STICKFIGURE_Y, STICKFIGURE_WIDTH, STICKFIGURE_HEIGHT)
setPreferredSize(new Dimension(STICKFIGURE_WIDTH, STICKFIGURE_HEIGHT));
}
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
stickFigure1.draw(g2);
}
public void changeColor(Color cIn)
{
stickFigure1.changeColorOfStickFigure(cIn);
repaint();
}
public void changeSize(int sIn)
{
stickFigure1.changeSizeOfStickFigure(sIn);
repaint();
}
private StickFigure stickFigure1;
private static final int STICKFIGURE_X = 200;
private static final int STICKFIGURE_Y = 0;
private static final int STICKFIGURE_WIDTH = 100;
private static final int STICKFIGURE_HEIGHT = 100;
}
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JRadioButton;
import javax.swing.JColorChooser;
import javax.swing.ButtonGroup;
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.Dimension;
public class StickFigureComponentViewer
{
public static void main(String[] args)
{
JFrame frame = new JFrame();
final StickFigureComponent stickFigure1 = new StickFigureComponent();
class ColorChooserListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
color = JColorChooser.showDialog(null, "PICK A COLOR", color);
if(color == null)
{
color = color.black;
}
stickFigure1.changeColor(color);
}
}
JRadioButton radioButton1 = new JRadioButton("1x", true);
radioButton1.setActionCommand("1x");
JRadioButton radioButton2 = new JRadioButton("2x", false);
radioButton2.setActionCommand("2x");
JRadioButton radioButton3 = new JRadioButton("3x", false);
radioButton3.setActionCommand("3x");
JRadioButton radioButton4 = new JRadioButton("4x", false);
radioButton4.setActionCommand("4x");
final ButtonGroup sizeGroup = new ButtonGroup();
sizeGroup.add(radioButton1);
sizeGroup.add(radioButton2);
sizeGroup.add(radioButton3);
sizeGroup.add(radioButton4);
class RadioListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(sizeGroup.getSelection().getActionCommand() == "2x")
{
stickFigure1.changeSize(2);
}
else if(sizeGroup.getSelection().getActionCommand() == "3x")
{
stickFigure1.changeSize(3);
}
else if(sizeGroup.getSelection().getActionCommand() == "4x")
{
stickFigure1.changeSize(4);
}
else
{
stickFigure1.changeSize(1);
}
}
}
JButton pickColorButton = new JButton("Pick Color");
pickColorButton.setBackground(Color.CYAN);
ActionListener colorChooserListener = new ColorChooserListener();
pickColorButton.addActionListener(colorChooserListener);
ActionListener radioListener = new RadioListener();
radioButton1.addActionListener(radioListener);
radioButton2.addActionListener(radioListener);
radioButton3.addActionListener(radioListener);
radioButton4.addActionListener(radioListener);
final JLabel pickSize = new JLabel("Pick Size");
JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
p2.setLayout(new BorderLayout());
JPanel p3 = new JPanel();
p3.setLayout(new BorderLayout());
p3.setPreferredSize(new Dimension(500,500));
p1.setOpaque(false);
p2.setOpaque(false);
p3.setOpaque(false);
p1.add(pickSize);
p1.add(radioButton1);
p1.add(radioButton2);
p1.add(radioButton3);
p1.add(radioButton4);
p2.add(pickColorButton,BorderLayout.LINE_START);
p3.add(stickFigure1);
frame.add(p1,BorderLayout.PAGE_END);
frame.add(p2,BorderLayout.LINE_START);
frame.add(p3,BorderLayout.LINE_END);
frame.setTitle("Stick Figure Customizer");
frame.setSize(FRAME_WIDTH,FRAME_HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setResizable(false);
}
private static final int FRAME_WIDTH = 1000;
private static final int FRAME_HEIGHT = 500;
private static Color color;
}
答案 0 :(得分：0)
您的StickFigureComponent没有任何可辨别的布局管理器大小来决定它应该有多大（事实上，它的默认大小实际上是0x0 ），所以布局管理员只是制作0x0。
覆盖getPreferredSize方法并返回适当的大小，以便布局管理员更好地决定如何处理您的组件......
public class StickFigureComponent extends JComponent
//...
@Override
public Dimension getPreferredSize() {
return new Dimension(STICKFIGURE_X + STICKFIGURE_WIDTH,
STICKFIGURE_Y + STICKFIGURE_HEIGHT);
}
<强>更新
仔细查看您的StickFigure构造函数...
public StickFigure(int xIn, int yIn, int wIn, int hIn) {
width = (int) (wIn * scale);
height = (int) (hIn * scale);
x = xIn;
y = yIn;
scale = 1;
color = Color.BLACK;
}
width和height值已设置为0，因为scale在初始化时默认为0 ...
相反，在应用之前初始化scale，例如......
public StickFigure(int xIn, int yIn, int wIn, int hIn) {
scale = 1;
width = (int) (wIn * scale);
height = (int) (hIn * scale);
x = xIn;
y = yIn;
color = Color.BLACK;
}
也...
sizeGroup.getSelection().getActionCommand() == "2x"
不是String比较在Java中是如何工作的，相反，你应该使用类似......
"2x".equals(sizeGroup.getSelection().getActionCommand())