Java 为什么我的网格上的线的端点超过该网格的给定宽度和高度?
我想画一个网格。比如说,x列的行是5x6。我的问题是,东部和南部的行尾超出了给定的列和行值。它不是很大,可能只有一毫米,但还是很烦人。我希望网格看起来像一个矩形,在上面的例子中,有20个单元格。我的代码中的错误在哪里?下面是绘制这个有缺陷网格的代码片段。谢谢Java 为什么我的网格上的线的端点超过该网格的给定宽度和高度?,java,grid,draw,Java,Grid,Draw,我想画一个网格。比如说,x列的行是5x6。我的问题是,东部和南部的行尾超出了给定的列和行值。它不是很大,可能只有一毫米,但还是很烦人。我希望网格看起来像一个矩形,在上面的例子中,有20个单元格。我的代码中的错误在哪里?下面是绘制这个有缺陷网格的代码片段。谢谢 package Main; import java.awt.Dimension; import javax.swing.JFrame; public class GridMain { public static void m
package Main;
import java.awt.Dimension;
import javax.swing.JFrame;
public class GridMain {
public static void main(String[] args) {
JFrame jframe = new JFrame();
jframe.setPreferredSize(new Dimension(640, 730));
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Mypanel mypanel = new Mypanel(5,6);
jframe.add(mypanel);
jframe.pack();
jframe.setVisible(true);
}
}
package Main;
import java.awt.Graphics;
import javax.swing.JPanel;
public class Mypanel extends JPanel {
/**
*
*/
private static final long serialVersionUID = 1L;
private int height;
private int width;
private int gapBetweenPoints = 20;
private int gapBetweenFrameAndGrid=15;
public Mypanel(int columns, int rows) {
width = columns;
height = rows;
}
protected void paintComponent(Graphics g) {
for (int i =0 ; i < height; i++) {
g.drawLine(gapBetweenFrameAndGrid, i * gapBetweenPoints
+ gapBetweenFrameAndGrid, width * gapBetweenPoints, i
* gapBetweenPoints + gapBetweenFrameAndGrid);
}
for (int i = 0; i < width; i++) {
g.drawLine(i * gapBetweenPoints + gapBetweenFrameAndGrid,
gapBetweenFrameAndGrid, i * gapBetweenPoints + gapBetweenFrameAndGrid,
height * gapBetweenPoints);
}
}
}
packagemain;
导入java.awt.Dimension;
导入javax.swing.JFrame;
公共类GridMain{
公共静态void main(字符串[]args){
JFrame JFrame=新JFrame();
jframe.setPreferredSize(新尺寸(640730));
jframe.setDefaultCloseOperation(jframe.EXIT_ON_CLOSE);
Mypanel Mypanel=新的Mypanel(5,6);
jframe.add(mypanel);
jframe.pack();
jframe.setVisible(true);
}
}
主包装;
导入java.awt.Graphics;
导入javax.swing.JPanel;
公共类Mypanel扩展了JPanel{
/**
*
*/
私有静态最终长serialVersionUID=1L;
私人内部高度;
私有整数宽度;
点与点之间的专用间隙=20;
FrameAndGrid之间的私有int GAP=15;
公共Mypanel(int列、int行){
宽度=列;
高度=行数;
}
受保护组件(图形g){
对于(int i=0;i
小心你的出发点;我将不触及宽度(高度),而仅触及宽度-1/高度-1。因此,以下代码:
for (int i =0 ; i < height; i++) {
g.drawLine(gapBetweenFrameAndGrid, i * gapBetweenPoints
+ gapBetweenFrameAndGrid, gapBetweenFrameAndGrid+(width-1) * gapBetweenPoints, i
* gapBetweenPoints + gapBetweenFrameAndGrid);
}
for (int i = 0; i < width; i++) {
g.drawLine(i * gapBetweenPoints + gapBetweenFrameAndGrid,
gapBetweenFrameAndGrid, i * gapBetweenPoints + gapBetweenFrameAndGrid,
gapBetweenFrameAndGrid+(height-1) * gapBetweenPoints);
}
for(int i=0;i
大体上
for (int i =0 ; i < height; i++) {
g.drawLine(startingX, i * gapBetweenPoints
+ gapBetweenFrameAndGrid, startingX+(width-1) * gapBetweenPoints, i
* gapBetweenPoints + gapBetweenFrameAndGrid);
}
for (int i = 0; i < width; i++) {
g.drawLine(i * gapBetweenPoints + gapBetweenFrameAndGrid,
startingY, i * gapBetweenPoints + gapBetweenFrameAndGrid,
startingY+(height-1) * gapBetweenPoints);
}
for(int i=0;i
有趣的是,当我从第一个for循环的(width*gapBetweenPoints)和第二个for循环的(height*gapBetweenPoints)中减去5时,我得到了我想要的结果。。但这显然不是我们做事的方式:-)太多了!这就解决了我的问题。澄清一下:在第二段代码中,在第一个循环中,为什么不将startingX添加到(i*gapBetweenPoints),而不是添加gapBetweenFrameAndGrid?我遗漏了什么?第二个循环也是如此