Java 奇怪的矩形渲染

Question

请问是不是bug

当我使用 fillRect 方法时，它会呈现一个比 drawRect 方法小一个像素的矩形。

有没有人遇到和我一样的问题？ :( 或者是否存在解决此问题的方法？

下面是一个小示例代码：

public Frame(){
    super("Sample rectangle");
    setExtendedState(this.getExtendedState() | JFrame.MAXIMIZED_BOTH);
    setUndecorated(true);       
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLocationRelativeTo(null);
    setVisible(true);
}

public void paint(Graphics g){
    g.setColor(Color.BLACK);
    g.fillRect(0,0, getWidth()-1, getHeight()-1);

    g.setColor(Color.RED);
    //g.drawRect(0,0, getWidth()-1, getHeight()-1);
    //wrap.graphics(g);
}

Answer 1

此行为与相关 Javadoc 中描述的完全一致：

fillRect Fills the specified rectangle. The left and right edges of the rectangle are at x and x + width - 1. The top and bottom edges are at y and y + height - 1

drawRect Draws the outline of the specified rectangle. The left and right edges of the rectangle are at x and x + width. The top and bottom edges are at y and y + height.

Answer 2

根据 Javadoc（强调我的）：

drawRect

Draws the outline of the specified rectangle. The left and right edges of the rectangle are at x and x + width. The top and bottom edges are at y and y + height. The rectangle is drawn using the graphics context's current color.

fillRect

Fills the specified rectangle. The left and right edges of the rectangle are at x and x + width - 1. The top and bottom edges are at y and y + height - 1. The resulting rectangle covers an area width pixels wide by height pixels tall. The rectangle is filled using the graphics context's current color.

Java 奇怪的矩形渲染

Java weird rectangle rendering

java

graphics

rendering