如何在秋千上制造障碍 [英] How to create obstacle in swing
问题描述
我想用Java用红色创建这个障碍
I want to create this obstacle in red color in Java
class Grid extends JFrame{
public Grid(){
setResizable(false);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(250,300);
// Set the width,height,number of rows and columns
final GridPanel panel = new GridPanel(300, 300, 10, 10);
add(panel);
}
}
class GridPanel22 extends JPanel{
int width, height, rows, columns;
int gridWidth, gridHeight;
public GridPanel22(int width, int height, int rows, int columns){
gridHeight = height / rows;
gridWidth = width / columns;
setPreferredSize(new Dimension(width, height));
}
public void paint(Graphics g){
g.setColor(Color.red);
for (int i = 1; i <= rows; i++) {
g.drawLine(0, i * gridHeight, width, i * gridHeight);
}
for (int j = 1; j <= columns; j++) {
g.drawLine(j * gridWidth, 0, j * gridWidth, height);
}
}
}
此代码创建了一个网格,但是我无法创建障碍.在图中,那些红色单元格是障碍单元格.要区分法线网格和主网格,我用红色绘制它. .我知道在Java中有一个叫做drawRect()
的函数,但是我不确定它是如何工作的.根据图片,从网格(1,1)到结束(5,4)都有一个障碍.现在要将这些单元格设置为障碍单元格,我想为所有这些单元格分配1(one)表示(1,1)-> 1,然后(2,1)-> 1 ......(5, 4)-> 1等.这样,当我的机器人从一个单元移动到另一个单元时,它可以避开那些单元,并找到到达目的地的自己的路径.
This code creates a grid but I'm unable to create an obstacles. In the picture those Red cells are the obstacle cell.To distinguish between normal grid and main grid I paint it with red. . I know that there is a function called drawRect()
in java but I'm not sure how it works.As per the picture there is a obstacle starting from grid (1,1) and ending it (5,4). Now to make those cell as a obstacle cell , I want to assign 1(one) to all those cells means (1,1)->1,then (2,1)->1 ......(5,4)->1 etc. So that when my Robot move from one cell to another it can avoid those cell and found it's own path to go to destination.
推荐答案
请注意代码中的注释:
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
class Grid extends JFrame{
public Grid(){
setResizable(false);
setDefaultCloseOperation(EXIT_ON_CLOSE);
final GridPanel panel = new GridPanel(300, 300, 4, 4);
panel.setColor(1, 1, Color.RED); //change cell colors
panel.setColor(2, 3, Color.RED);
add(panel);
pack();
setVisible(true);
}
}
class GridPanel extends JPanel{
//store reference to each cells
Component[][] cells;
public GridPanel (int width, int height, int rows, int columns){
cells = new Component[rows][columns];
//use grid layout to get the layout you want
setLayout(new GridLayout(rows, columns));
setPreferredSize(new Dimension(width, height));
for(int row =0; row < rows; row ++){
for(int col =0; col < columns; col ++){
Component cell = getCell();
cells[row][col] = cell;
add(cell);
}
}
}
//represent each cell as a label
Component getCell() {
JLabel label = new JLabel();
label.setBackground(Color.WHITE);
label.setOpaque(true);
label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
return label;
}
//control color of each cell
void setColor(int row, int col, Color color) {
cells[row][col].setBackground(color);
}
public static void main(String[] args) { new Grid(); }
}
请随时根据需要进行澄清.
Don't hesitate to ask for clarifications as needed.
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