如何使用大小相等的网格绘制 Canvas ? 问题:http://tinypic.com/r/idvc0j/5 该代码绘制的最后一个单元格的大小与其他单元格不平行。 我必须在 Paint() 方法中做哪些更改?
import java.awt.*;
import javax.swing.*;
public class Grid extends Canvas{
Cell[][] maze;
int rows;
int cols;
Grid(int rows, int cols) {
this.rows = rows;
this.cols = cols;
maze = new Cell[rows][cols];
}
public static void main(String[] args){
JFrame f = new JFrame("Sample");
Grid x = new Grid(25,25);
f.add(x);
f.pack();
f.setVisible(true);
f.setSize(600,600);
f.setResizable(false);
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void paint(Graphics g) {
int k;
int width = getSize().width;
int height = getSize().height;
int htOfRow = height / (rows);
for (k = 0; k < rows; k++)
g.drawLine(0, k * htOfRow , width, k * htOfRow );
int wdOfRow = width / (cols);
for (k = 0; k < cols; k++)
g.drawLine(k*wdOfRow , 0, k*wdOfRow , height);
}
}
class Cell {
// private final static int NORTH = 0;
// private final static int EAST = 1;
// private final static int WEST = 2;
// private final static int SOUTH = 3;
// private final static int NO = 0;
// private final static int START = 1;
// private final static int END = 2;
// boolean[] wall = new boolean[4];
// boolean[] border = new boolean[4];
// boolean[] backtrack = new boolean[4];
// boolean[] solution = new boolean[4];
// private boolean isVisited = false;
// private boolean isCurrent = false;
// private int Key = 0;
//
// public Cell(){
// for(int i=0;i<4;i++){wall[i] = true;}
// }
// public void setStart(int i){Key = i;}
// public int getKey(){return Key;}
// public boolean checkVisit(){return isVisited;}
// public void stepIn(){
// isCurrent = true;
// isVisited = true;
// }
// public void stepOut(){isCurrent = false;}
}
最佳答案
你四舍五入太早了。 htOfRow
和 wdOfRow
不是精确的 int
值。通过将它们转换为 int
,您可以让小错误在整个网格范围内累积。
相反,将它们保留为 double
,将它们乘以 k
,然后才将它们转换回 int
。
例如:
如果width = 100
且cols = 8
则wdOfRow = 12.5
。
如果在 k=8
时将其转换为 int
,然后再乘以 k
,那么您将最后一行放在 12*8=96
处。
如果您乘以 double
然后转换为 int
,您的最后一行将位于 12.5*8 = 100
这是固定代码:
import java.awt.Canvas;
import java.awt.Graphics;
import java.awt.Rectangle;
import javax.swing.JFrame;
public class Layout
{
public static void main( String[] args )
{
JFrame f = new JFrame( "Sample" );
Grid x = new Grid( 50, 50 );
f.add( x );
f.pack( );
f.setVisible( true );
f.setSize( 600, 600 );
f.setResizable( false );
f.setLocationRelativeTo( null );
f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
}
static class Cell
{
}
public static class Grid extends Canvas
{
Cell[][] maze;
int rows;
int cols;
Grid( int rows, int cols )
{
this.rows = rows;
this.cols = cols;
maze = new Cell[rows][cols];
}
public void paint( Graphics g )
{
int k;
double width = getSize( ).width;
double height = getSize( ).height;
double htOfRow = height / ( rows );
for ( k = 0; k < rows; k++ )
g.drawLine( 0, ( int ) ( k * htOfRow ), ( int ) width, ( int ) ( k * htOfRow ) );
double wdOfRow = width / ( cols );
for ( k = 0; k < cols; k++ )
g.drawLine( ( int ) ( k * wdOfRow ), 0, ( int ) ( k * wdOfRow ), ( int ) height );
}
}
}
关于java - Canvas 中的网格,最后一个单元格的大小与其他单元格不同,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10059435/