Java 抽绳和Ellipse2D兼容性问题
我有一个GUI,我正在使用drawString来标记Ellipse2D对象的行。问题是这两个选项并不像我希望的那样同时显示在同一个选项卡窗格中 问:为什么会发生这种情况 javaJava 抽绳和Ellipse2D兼容性问题,java,swing,awt,Java,Swing,Awt,我有一个GUI,我正在使用drawString来标记Ellipse2D对象的行。问题是这两个选项并不像我希望的那样同时显示在同一个选项卡窗格中 问:为什么会发生这种情况 java import javax.swing.*; import java.awt.*; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.geom.Ellipse2D; import java.util.
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.util.*;
@SuppressWarnings("serial")
class DrawEllipses extends JPanel {
private static final int OVAL_WIDTH = 30;
private static final Color INACTIVE_COLOR = Color.RED;
private static final Color ACTIVE_COLOR = Color.green;
private java.util.List<Point> points;
private java.util.List<Ellipse2D> ellipses = new ArrayList<>();
private Map<Ellipse2D, Color> ellipseColorMap = new HashMap<>();
/*
* This method is used to populate ellipses with initialized ellipse2D
*/
public DrawEllipses(java.util.List<Point> points) {
JLabel outBound = new JLabel("<html><font size=6>External Port</font></html>");
this.points = points;
for (Point p : points) {
int x = p.x - OVAL_WIDTH / 2;
int y = p.y - OVAL_WIDTH / 2;
int w = OVAL_WIDTH;
int h = OVAL_WIDTH;
Ellipse2D ellipse = new Ellipse2D.Double(x, y, w, h);
ellipses.add(ellipse);
ellipseColorMap.put(ellipse, INACTIVE_COLOR);
}
MyMouseAdapter mListener = new MyMouseAdapter();
addMouseListener(mListener);
addMouseMotionListener(mListener);
add(outBound);
}
/*
* paintComponent is used to paint the ellipses
*/
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
for (Ellipse2D ellipse : ellipses) {
g2.setColor(ellipseColorMap.get(ellipse));
g2.fill(ellipse);
}
}
/*
* MouseAdapter is extended for mousePressed Event that detects if the x, y coordinates
* of a drawn ellipse are clicked. If the color is INACTIVE it is changed to ACTIVE and
* vice versa.
*/
private class MyMouseAdapter extends MouseAdapter {
@Override
/*
* When mousePressed event occurs, the color is toggled between ACTIVE and INACTIVE
*/
public void mousePressed(MouseEvent e) {
Color c = null;
for (Ellipse2D ellipse : ellipses) {
if (ellipse.contains(e.getPoint())) {
c = (ellipseColorMap.get(ellipse) == INACTIVE_COLOR) ? ACTIVE_COLOR : INACTIVE_COLOR;
ellipseColorMap.put(ellipse, c);
}
}
repaint();
}
}
/*
*Used for button click action to change all ellipses to ACTIVE_COLOR
*/
public void activateAll(){
for (Ellipse2D ellipse : ellipses){
ellipseColorMap.put(ellipse, ACTIVE_COLOR);
}
repaint();
}
/*
*Used for button click action to change all ellipses to INACTIVE_COLOR
*/
public void deactivateAll(){
for (Ellipse2D ellipse : ellipses){
ellipseColorMap.put(ellipse, INACTIVE_COLOR);
}
repaint();
}
}
问题可能是您的布局管理器。布局管理器负责设置面板上每个组件的大小/位置 此外,在进行自定义绘制时,需要覆盖每个组件的
getPreferredSize()
方法,以便布局管理器可以使用这些信息设置每个组件的大小/位置。如果大小为(0,0),则没有要绘制的内容
有关更多信息和工作示例,请阅读上Swing教程的部分
如果你需要更多的帮助,那么发布一个适当的说明问题的帖子。您在上一个问题中发布的代码不是SSCCE。我们不需要50分来证明一个概念。您不需要所有操作,因为它们与零部件的对齐无关。SSCCE的目的是简化代码。如果这些方法不在同一个位置绘制,那么问题似乎在别处。在何处实例化并将
抽绳
和抽屉
添加到其他对象?哪个选项卡式窗格?显示的代码不包含选项卡窗格。向我们展示您如何尝试将这两个实例添加到选项卡窗格中。我找到了答案。我试图通过操作事件添加到新选项卡。这导致图形渲染出现问题。我将字符串创建添加到draw ellipse方法中,现在可以使用了。谢谢你的建议。@feltersnach,我将字符串创建添加到了draw ellipse方法中,现在它可以工作了
-绘画方法仅用于绘画。它们不应用于创建其他组件。@camickr我的措辞不正确。我向Drawellipes方法添加了drawString调用。
import javax.swing.*;
import java.awt.*;
class DrawString extends JPanel {
private static final Color STRING_COLOR = Color.BLACK;
public DrawString() {}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(STRING_COLOR);
g.drawString("1", 40, 80);
g.drawString("2", 40, 160);
}
}