Java改变形状的颜色

Question

我正在尝试用 Java 制作一个矩形，完成了。我也可以用纯色填充它，完成。但我实际上想改变形状本身的纯色。我知道对于 Graphics 你可以使用 g.setColor();但是我已经用一种特殊的方式设置了我的组件，如下所示:

public class Design extends JComponent {
private static final long serialVersionUID = 1L;

private List<Shape> shapesDraw = new ArrayList<Shape>();
private List<Shape> shapesFill = new ArrayList<Shape>();

GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
int screenWidth = gd.getDisplayMode().getWidth();
int screenHeight = gd.getDisplayMode().getHeight();

public void paint(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    for(Shape s : shapesDraw){
        g2d.draw(s);
    }
    for(Shape s : shapesFill){
        g2d.fill(s);
    }
}

public void drawRect(int xPos, int yPos, int width, int height) {
    shapesDraw.add(new Rectangle(xPos, yPos, width, height));
    repaint();
}

public void fillRect(int xPos, int yPos, int width, int height) {
    shapesFill.add(new Rectangle(xPos, yPos, width, height));
    repaint();
}

public void drawTriangle(int leftX, int topX, int rightX, int leftY, int topY, int rightY) {
    shapesDraw.add(new Polygon(
            new int[]{leftX, topX, rightX},
            new int[]{leftY, topY, rightY},
            3));
    repaint();
}

public void fillTriangle(int leftX, int topX, int rightX, int leftY, int topY, int rightY) {
    shapesFill.add(new Polygon(
            new int[]{leftX, topX, rightX},
            new int[]{leftY, topY, rightY},
            3));
    repaint();
}

public Dimension getPreferredSize() {
    return new Dimension(screenWidth, screenHeight);
}

public int getWidth() {
    return screenWidth;
}
public int getHeight() {
    return screenHeight;
}

}

如您所见，它不只是绘制和填充，而是使用列表来绘制。有没有办法可以更改列表<形状>中的颜色？我最好希望每个绘图/填充形状内的颜色都可以更改。

感谢您的帮助。

根据回答更新:

我的类如下来自您的 ShapeWrapper 示例:

public class Design extends JComponent {
private static final long serialVersionUID = 1L;

private List<ShapeWrapper> shapesDraw = new ArrayList<ShapeWrapper>();
private List<ShapeWrapper> shapesFill = new ArrayList<ShapeWrapper>();

GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
int screenWidth = gd.getDisplayMode().getWidth();
int screenHeight = gd.getDisplayMode().getHeight();

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    for(ShapeWrapper s : shapesDraw){
        g2d.setColor(s.color);
        g2d.draw(s.shape);
    }
    for(ShapeWrapper s : shapesFill){
        g2d.setColor(s.color);
        g2d.fill(s.shape);
    }
}

public void drawRect(int xPos, int yPos, int width, int height) {
    shapesDraw.add(new Rectangle(xPos, yPos, width, height));
    repaint();
}

public void fillRect(int xPos, int yPos, int width, int height) {
    shapesFill.add(new Rectangle(xPos, yPos, width, height));
    repaint();
}

public void drawTriangle(int leftX, int topX, int rightX, int leftY, int topY, int rightY) {
    shapesDraw.add(new Polygon(
            new int[]{leftX, topX, rightX},
            new int[]{leftY, topY, rightY},
            3));
    repaint();
}

public void fillTriangle(int leftX, int topX, int rightX, int leftY, int topY, int rightY) {
    shapesFill.add(new Polygon(
            new int[]{leftX, topX, rightX},
            new int[]{leftY, topY, rightY},
            3));
    repaint();
}


public Dimension getPreferredSize() {
    return new Dimension(getWidth(), getHeight());
}

public int getWidth() {
    return screenWidth;
}
public int getHeight() {
    return screenHeight;
}

}

class ShapeWrapper {

    Color color;
    Shape shape;

    public ShapeWrapper(Color color , Shape shape){
        this.color = color;
        this.shape = shape;
    }
}

现在我在 Eclipse 中编码，除了一件事之外一切正常!!每次它说 shapesDraw/shapesFill.add() 它说:

类型List中的方法add(ShapeWrapper)不适用于参数(Rectangle)

太近了!请回复。

Answer 1

你可以使用类似的东西:

private class ShapeWrapper {

    private Color color;
    private Shape shape;

    public ShapeWrapper(Color color , Shape shape){
        this.color = color;
        this.shape = shape;
    }
}

代替普通的Shape来存储Shape+Color。

然后像下一个一样绘制它们:

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    for(ShapeWrapper s: shapesDraw){
        g2d.setColor(s.color);
        g2d.draw(s.shape);
    }
    for(ShapeWrappers s : shapesFill){
        g2d.setColor(s.color);
        g2d.fill(s.shape);
    }
}

编辑:根据您的异常(exception)情况，您尝试将另一个类(Shape)的对象添加到类型化列表(ShapeWrapper)中，像接下来那样修复您的方法:

public void drawRect(int xPos, int yPos, int width, int height) {
    ShapeWrapper wr = new ShapeWrapper(Color.RED,new Rectangle(xPos, yPos, width, height));
    shapesDraw.add(wr);
    repaint();
}