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我試圖在圖片上用一個矩形標記一個三角形(我標出了圖片)。我已經設法繪製三角形,但我不能用矩形標記它。 這裏是我到目前爲止已經編寫的代碼:paintComponent和mouseListener的問題
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
abstract class Places extends JComponent {
private boolean marked;
private String placeName;
private PlacePosition position;
private String placeColor;
private String placeCategory;
public Places(String name, String category, PlacePosition position) {
setBounds(position.x, position.y, 20, 20);
placeName = name;
this.position = position;
placeCategory = category;
this.placeColor = placeColor;
mouseListener mL = new mouseListener();
}
public Color rightColor() {
Color c = Color.BLACK;
switch (placeCategory) {
case "None":
c = Color.BLACK;
break;
case "Buss":
c = Color.RED;
break;
case "Tunnelbana":
c = Color.BLUE;
break;
case "Tåg":
c = Color.GREEN;
break;
}
return c;
}
public PlacePosition getPosition() {
return position;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
int[] polyX = { 0, 15, 30 };
int[] polyY = { 0, 30, 0 };
setBounds(position.x - 15, position.y - 30, 30, 30);
setPreferredSize(new Dimension(50, 50));
setMaximumSize(new Dimension(50, 50));
setMinimumSize(new Dimension(50, 50));
g.setColor(rightColor());
g.fillPolygon(polyX, polyY, 3);
if (marked) {
g.drawRect(30, 30, 30, 30);
g.setColor(Color.YELLOW);
}
repaint();
}
abstract void printText();
class mouseListener extends MouseAdapter {
public void mouseClicked(MouseEvent mE) {
if (SwingUtilities.isLeftMouseButton(mE)) {
if (!marked) {
marked = true;
} else {
marked = false;
}
}
revalidate();
repaint();
}
}
}
我的猜測是,有一些不同的MouseListener工作,但我是相當的不確定性。非常感謝幫助!
Omg,這是一個煩人的小姐......謝謝你的幫助! –
出於好奇,爲什麼不能從paintComponent方法中調用repaint()? –
@MyJärphed:你基本上是在創造一個「窮人的遊戲循環」,一個你完全無法控制的遊戲循環,一個從根本上改變關鍵Swing方法的動作。 paintComponent方法用於繪畫和繪畫,不應該用於混淆遊戲循環。使用Swing Timer或其他一些可以控制的構造。 –