[英]Weird output for Graphics code
我正在嘗試制作一個Connect Four游戲,以提高我使用Java Graphics和作為學校項目的能力。 游戲的背景將是一個藍色的JPanel
,游戲板將是一個單獨的JPanel,將放置在背景頂部。 請參閱下面的課程:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;
public class gameBoard extends JPanel {
private Board bored;
public gameBoard(){
setLayout(new BorderLayout());
bored = new Board();//does not appear in Center Region of gameBoard
add(bored, BorderLayout.CENTER);
}
public void paint(Graphics g){//This line is the one that is acting weird.
//blue rectangle board is here, but when repaint called
//JFrame turns blue and does not add new JPanel called above
g.setColor(Color.BLUE);
g.fillRect(0, 0, 1456, 916);
}
}
和
import java.awt.BasicStroke;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Graphics2D;
import javax.swing.JPanel;
public class Board extends JPanel {
/*
* 2d array will represent board and take 1's(red) and 2's(black) the nums
* represent pieces, with each redraw of the board, a check will be done to
* compare a sum against blackWin and redWin. Sum will be created by
* summing a continuous line of 1's or 2's going left -> right
*/
public int[][] boardEvalMatrix = new int[6][7];
private final int blackWin = 8, redWin = 4;
public Board() {//1200 x 764
BoardMethods a = new BoardMethods();
a.printBoard(getBoard());
JPanel panelLORDY = new JPanel(new FlowLayout());
repaint();
}
public int[][] getBoard(){
return boardEvalMatrix;
}
public void paint(Graphics g){
g.setColor(Color.BLUE);//Drawing background with actual board as a Test
g.fillRect(0, 0, 1456, 916);//will not remain like this
Graphics2D newG = (Graphics2D) g;
newG.setStroke(new BasicStroke(15));
g.setColor(Color.YELLOW);
for(int a = 0; a < 6; a++)//rows for board --- rowHeight is 127
g.drawRect(128, 68+ (a*127), 1200, 127);
//g.setColor(Color.BLACK);
//newG.setStroke(new BasicStroke(8));
//for(int a = 0; a < 7; a++)//columns for board --- columnWidth is 171
// g.drawRect(208, 152, 70, 10);
//g.drawLine(50,0, 1456, 916); //width 1456 length 916 - school computer monitors
}
}
所以這是怎么回事:
問題1:
當我在gameBoard
類中包含public void paint(Graphics g)
行時,即使沒有調用repaint()
並且paint()
方法為空,運行驅動程序時出現的顯示也只是一個灰色的JFrame
。 。 但是,當我刪除創建paint
方法的行時,問題消失了,並且出現了正確的顯示。
問題2:
即使當我在gameBoard
類的paint
方法中放置代碼以繪制藍色矩形並調用repaint()
, JFrame
也是藍色的,這在一定程度上是正確的。 我知道Java從上到下執行命令,因此我確保將實際游戲板添加到gameBoard
JPanel
的代碼是在繪制一個藍色矩形后出現的,但是沒有用。
題:
我做錯了什么以及如何解決?
要更改面板的背景色,請使用:
setBackground( Color.BLUE );
在面板上。 然后,無需自定義繪畫。
當您重寫paint()
並忘記了super.paint()
,您真的會弄亂繪畫過程。 paint()
方法負責在面板上繪制子組件。 由於您不調用super.paint()
因此子代永遠不會被繪制。
如果由於某種原因確實需要自定義繪畫,則應該重寫paintComponent()
方法,不要忘記調用super.paintComponent()
。 不要覆蓋paint()。
閱讀有關“自定義繪畫”的Swing教程,尤其是有關“仔細研究繪畫機制”的部分, 以獲取更多信息和示例。
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