Creating a draw rectangle (filled with black color) function in Java for a grid(在Java中为网格创建绘制矩形(填充黑色)函数)
问题描述
我在我的程序中创建了一个网格.下面是用于创建网格的代码.
I have created a grid in my program. Below is the code used to create the grid.
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.JFrame;
class Grid extends JComponent {
public void paint(Graphics g) {
g.drawRect (10, 10, 800, 500);
for (int i = 10; i <= 800; i+= 10)
g.drawLine (i, 10, i, 510);
for (int i = 10; i <= 500; i+= 10)
g.drawLine (10, i, 810, i);
}
}
public class CoreControl {
public static void main(String[] a) {
JFrame window = new JFrame();
window.setSize(840,560);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.getContentPane().add(new Grid());
window.setVisible(true);
}
}
我想做的是创建一个函数,该函数将根据我给它的坐标绘制一个矩形(用黑色填充).基本上我想用黑色填充网格的某些单元格,我的想法是在单元格坐标上绘制黑色填充矩形.如何实现这个功能?
What I want to do is to create a function which will draw a rectangle (filled with black color) based on the coordinates that I give it. Basically I want to populate certain cells of the grid with black color and my idea is to draw black filled rectangles on the cell coordinates. How do I make this function?
我尝试创建另一个名为 drawRectangle 的类并在主函数中调用它,例如 window.getContentPane().add(new drawRectangle());但这不起作用(只显示 drawRectangle 而不是网格).
I tried making another class called drawRectangle and called it in the main function like so window.getContentPane().add(new drawRectangle()); however that did not work (only drawRectangle shows up and not the grid).
我还希望能够反复使用此功能来不断创建矩形.
I also want to be able to use this function repeatedly to keep creating rectangles.
如何创建这个函数?
另外,如果您知道我应该构建这个程序的更好方法,请告诉我(我是 Java 新手,所以我愿意接受任何建议).
Also if you know a better way that I should structure this program please let me know (I am new to Java so I am open to any suggestions).
推荐答案
- 不要使用
paint
,使用paintComponent
并且不要忘记调用super.paintComponent
JComponent
可能不是最佳选择,JPanel
可能是更好的选择Graphics#fillRect(int, int, int, int)
?
- Don't use
paint
, usepaintComponent
and don't forget to callsuper.paintComponent
JComponent
may not be the best choice,JPanel
is probably a better choice- What's wrong with
Graphics#fillRect(int, int, int, int)
?
您可以看看 Performing Custom Painting 和 2D 图形了解更多详情.
You might to take a look at Performing Custom Painting and 2D Graphics for more details.
我建议不要尝试使用第二个组件来执行填充.只需在网格类中提供一个方法,该方法提供单元格的 x/y 位置(以网格形式)并在 paintComponent
方法中填充单元格
I'd advice against trying to have a second component to performing the filling. Simply provide a method in you grid class that supplies the cell's x/y position (in grid terms) and fill the cell within the paintComponent
method
更新示例
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Point;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class CoreControl {
public static class Grid extends JPanel {
private List<Point> fillCells;
public Grid() {
fillCells = new ArrayList<>(25);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
for (Point fillCell : fillCells) {
int cellX = 10 + (fillCell.x * 10);
int cellY = 10 + (fillCell.y * 10);
g.setColor(Color.RED);
g.fillRect(cellX, cellY, 10, 10);
}
g.setColor(Color.BLACK);
g.drawRect(10, 10, 800, 500);
for (int i = 10; i <= 800; i += 10) {
g.drawLine(i, 10, i, 510);
}
for (int i = 10; i <= 500; i += 10) {
g.drawLine(10, i, 810, i);
}
}
public void fillCell(int x, int y) {
fillCells.add(new Point(x, y));
repaint();
}
}
public static void main(String[] a) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
Grid grid = new Grid();
JFrame window = new JFrame();
window.setSize(840, 560);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.add(grid);
window.setVisible(true);
grid.fillCell(0, 0);
grid.fillCell(79, 0);
grid.fillCell(0, 49);
grid.fillCell(79, 49);
grid.fillCell(39, 24);
}
});
}
}
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本文标题为:在Java中为网格创建绘制矩形(填充黑色)函数
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