Java - 更改使用Graphics2D创建的某些正方形的颜色 [英] Java - Change the color of some squares created with Graphics2D

问题描述

我创建了一个类：

$ b $

我想创建一个简单的游戏100 x 100平方， b

  public class Draw extends JComponent {
 private List< Graphics2D> recList = new ArrayList< Graphics2D>（）; 
 public void paint（Graphics g）{
 //要设置（0,0）面板左下角开始
 Graphics2D g2 =（Graphics2D）g; 
 AffineTransform at = g2.getTransform（）; 
 at.translate（0，getHeight（））; 
 at.scale（1，-1）; 
 g2.setTransform（at）; 
 
 //绘制所有的方程
 for（int i = 0; i <100; i ++）{
 for（int j = 0; j <100; j ++ ）{
 g2.setColor（Color.red）; 
 g2.drawRect（5 * i，5 * j，5，5）; 
 recList.add（g2）; //将每个正方形存储到列表中以更改颜色
} 
} 
} 
} 
  

然后我把它拖到netbeans的设计窗口，正方形画，看起来不错...

似乎我做错了动作。在第一次，我想使用他们的位置从列表中获取一个特定的方块，但 Graphic2d 没有任何方法来获取位置（x和y）或改变颜色。

我不知道有没有其他方法可以让它成真？
PS：还有一件事，我可以将每个方块的位置设置为它的中心吗？

解决方案

您自己的 Tile 类，其中存储 x ， y ， width ， height 和 color 。每个 Tile 对象也可以负责绘画本身：

  Tile {
 private int x，y，width，height; 
 private颜色; 
 
 public Tile（int x，int y，int width，int height，Color color）{
 this.x = x; 
 this.y = y; 
 this.width = width; 
 this.height = height; 
 this.color = color; 
} 
 
 public void paint（Graphics g）{
 g.setColor（color）; 
 g.fillRect（x，y，width，height）; 
} 
} 
  

先手创建图块：

 列表< Tile> tiles = ...; 
 
 void createTiles（）{
 for（int x = 0; x< 100; x ++）{
 for（int y = 0; y< 100; y ++） {
颜色= ...; // choose color 
 int size = 5; 
 int tileX = x * size; 
 int tileY = y * size; 
 tiles.add（new Tile（tileX，tileY，size，size，color））; 
} 
} 
} 
  

在绘画方法中向对象添加对象：

  void paint（Graphics g）{
 tiles.forEach（tile  - > ; tile.paint（g））; 
} 
  

I just want to create a simple game with 100 x 100 square, each square is 5 pixels.

I created a class:

public class Draw extends JComponent{
    private List<Graphics2D> recList = new ArrayList<Graphics2D>();
    public void paint(Graphics g) {
        //THIS TO SET (0,0) PANEL START AT BOTTOM LEFT
        Graphics2D g2 = (Graphics2D)g;
        AffineTransform at = g2.getTransform();
        at.translate(0, getHeight());
        at.scale(1, -1);
        g2.setTransform(at);

        //THIS TO DRAW ALL THE SQUARES
        for (int i = 0;i<100;i++){
            for (int j=0;j<100;j++){
                g2.setColor(Color.red);
                g2.drawRect(5*i, 5*j, 5, 5);
                recList.add(g2); //Store each square to the list to change the color
            }
        }
    }
}

Then I just drag it to the design windows of netbeans and the squares are painted, looks good...

But it seems like I made a wrong move. At the first time I wanted to get a specific square from the list using their location, but the Graphic2d doesn't have any method to get the location (x and y) or to change the color.

I don't know if there is any other way I can make it come true? PS: One more thing, can I set the location of each square to its center?

解决方案

You could create your own Tile class, which stores info such as x, y, width, height, and color. Each Tile object could also be in charge of painting itself:

class Tile {
    private int x, y, width, height;
    private Color color;

    public Tile(int x, int y, int width, int height, Color color) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        this.color = color;
    }

    public void paint(Graphics g) {
        g.setColor(color);
        g.fillRect(x, y, width, height);
    }
}

Create the tiles before-hand:

List<Tile> tiles = ...;

void createTiles() {
    for(int x = 0; x < 100; x++) {
        for(int y = 0; y < 100; y++) {
            Color color = ...; //choose color
            int size = 5;
            int tileX = x * size;
            int tileY = y * size;
            tiles.add(new Tile(tileX, tileY, size, size, color));
        }
    }
}

Then render by passing the graphics object to them in the paint method:

void paint(Graphics g) {
    tiles.forEach(tile -> tile.paint(g));
}

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