[英]Why can't I create a shape on jpanel?
我正在使用套接字編程在Java gui上工作。我想使用從服務器發送的參數在jframe上創建jpanel,並在jpanel中創建隨機形狀。 我使用此資源來繪制形狀:
https://github.com/AugustBrenner/Random-Draw-Shape/blob/master/DrawPanel.java
我在jframe中的代碼是;
public void starteGame(String received) {
gamers.setText(received);
String[] mParsed = received.split(" ");
boolean filled = true;
int width = Integer.parseInt(mParsed[2]);
int height = Integer.parseInt(mParsed[1]);
int x1 = Integer.parseInt(mParsed[3]);
int y1 = Integer.parseInt(mParsed[4]);
int x2 = Integer.parseInt(mParsed[5]);
int y2 = Integer.parseInt(mParsed[6]);
int randomShape = Integer.parseInt(mParsed[7]);
Color firstColor = new Color(Integer.parseInt(mParsed[8]), true);
Color secondColor = new Color(Integer.parseInt(mParsed[9]), true);
boolean cyclic = Boolean.parseBoolean(mParsed[10]);
switch (randomShape) {
case 1:
// add the line to the list of lines to be displayed
shape = new MyPolygon(x1, y1, x2, y2, firstColor, filled);
break;
case 2:
shape = new MyRectangle(x1, y1, x2, y2, firstColor, filled);
break;
case 3:
shape = new MyOval(x1, y1, x2, y2, firstColor, filled);
break;
}
jPanel2=new PanelDraw(width,height,x1,y1,x2,y2,firstColor,secondColor,
randomShape,shape,cyclic);
}
And my PanelDraw is;
public class PanelDraw extends JPanel implements MouseMotionListener {
private Random randomNumbers;
private MyShape shape;
int x1;
int y1;
int x2;
int y2;
Color firstColor;
Color secondColor;
int width;
int height;
// generate random shape
int randomShape;
boolean cyclic ;
// constructor, creates a panel with random shapes
public PanelDraw(int width, int height, int x1, int y1, int x2, int y2,
Color first, Color second, int randomS,MyShape shape ,boolean cyclic) {
this.width = width;
this.height = height;
// generate random coordinates
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
// generate a random color
this.firstColor = first;
this.secondColor = second;
// generate random shape
randomShape = randomS;
this.shape=shape;
this.cyclic=cyclic;
//setBackground( Color.BLACK );
} // end DrawPanel constructor
public void mouseMoved(MouseEvent event) {
}// end mouseMoved
public void mouseDragged(MouseEvent event) {
} // end method
// for each shape array, draw the individual shapes
@Override
public void paintComponent(Graphics g) {
//initialize filled boolean to true;
boolean filled = true;
// initialize random cyclic boolean
// draw the shape
Graphics2D g2d = (Graphics2D) g; // cast g to Graphics2D
g2d.setPaint(new GradientPaint(x1, y1, firstColor, x2, y2,
secondColor, cyclic));
shape.draw(g2d);
g2d.dispose();
// shapeCount++;
try {
Thread.sleep(700);
} catch (Exception e) {
}
repaint();
} // end method paintComponent
} // end class DrawPanel
當我的函數正在運行且隨機形狀不出現時,面板不會出現。 你能幫助我嗎?
Thread.sleep(700);
永遠不要在繪畫方法中使用Thread.sleep()。
這將導致事件調度線程進入睡眠狀態,這意味着GUI無法重繪自身或響應事件。
也:
切勿在繪畫方法中調用reapint()。 如果需要動畫,請使用Swing計時器。
paintCoponent()方法中的第一條語句應為super.paintComponent(g)
,以確保在執行自定義繪畫之前清除面板的背景。
try {
Thread.sleep(700);
} catch (Exception e) {
}
在paintComponent
方法內部:/
Swing是單線程的(並且不是線程安全的),在paintComponent
執行此操作將防止對所有內容進行繪制,直到返回sleep
之后,它還將停止所有用戶交互。
有關更多詳細信息,請參見Swing中的並發。
Graphics2D g2d = (Graphics2D) g; // cast g to Graphics2D
//...
g2d.dispose();
傳遞給您的Graphics
上下文是由系統創建的,並且在繪制過程中被繪制的所有組件之間共享。 這樣處理可能會導致其他組件被塗漆
repaint();
在paintComponent
方法中。
請勿直接或間接更改噴塗過程中任何組件的狀態。 繪畫應該畫狀態,別無其他。 這樣做將導致重新繪制管理器運行異常並消耗所有CPU周期
jPanel2=new PanelDraw(width,height,x1,y1,x2,y2,firstColor,secondColor, randomShape,shape,cyclic);
是的,但是您沒有將組件添加到任何東西中,因此應該如何繪畫?
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