JApplet - super.paint（）;导致闪烁 [英] JApplet - super.paint(); causes flicker

问题描述

我现在正在编写一个JApplet，每当我调用super.paint（）时，applet都会闪烁。
我正在使用双缓冲（绘制到图像，然后渲染该图像），但我认为super.paint（）正在清除屏幕或其他东西，击败我的双缓冲区。

I'm writing a JApplet right now, and whenever I call super.paint(), the applet flickers. I am using double buffering (drawing to an image, and then rendering that image), but I think super.paint() is clearing the screen or something, defeating my double buffer.

我知道我应该使用paintComponents（），但出于某种原因，当我调用currentScreen.Draw（g）时，它不会显示屏幕的绘制。

I know I'm supposed to use paintComponents(), but for some reason, when I call "currentScreen.Draw(g)," it won't show the screen's draw.

任何人都可以帮我吗？

public void paint(Graphics g)
{   

    super.paint(g);//Remove this and it works, but the JApplet background color will be gone, and everything will be white.

    currentScreen.Draw(g);
}

屏幕绘制方法

public void Draw(Graphics g)
{

    if(buffer != null)
        g.drawImage(buffer, 150, 0, null);
    //g.drawString(drawstring, x, y);
}

推荐答案

不要使用油漆和不要直接在JApplet中绘制。而是在JPanel的paintComponent方法中绘制并调用super.paintComponent（g）作为该方法的第一行。将JPanel添加到JApplet的contentPane中以允许applet显示它。

Don't use paint and don't draw directly in the JApplet. Instead draw in a JPanel's paintComponent method and call super.paintComponent(g) as the first line of that method. Add that JPanel to your JApplet's contentPane to allow the applet to display it.

编辑1

此外你还可以'为此使用paintComponent s ，因为这会完全不同。再次使用paintComponent但仅在从JComponent派生的组件中，例如JPanel（或JComponent本身）。

Edit 1
Also you can't use paintComponents for this as this does something entirely different. Again use paintComponent but only in a component that derives from JComponent such as a JPanel (or a JComponent itself).

编辑2
还总是将@Override放在paintComponent方法之上，以确保实际上覆盖了super方法。

Edit 2 Also always put an @Override above your paintComponent method to be sure that you are in fact overriding the super method.

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