Question

我正在尝试用Java制作一个矩形。我也可以用纯色填充它，完成。但我想实际改变形状本身的纯色。我知道有了Graphics，你可以使用g.setColor（）;但是我的组件设置方式如下所示：

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;
}

}

正如你所看到的，它不仅仅是绘图和填充，而是使用一个列表来绘制它。有没有办法可以改变列表中的颜色＆lt;形状＆gt;？我最好希望颜色在每个绘制/填充形状内都可以改变。

感谢您的帮助。

从回答更新：

我的课程如下：来自你的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，一切正常，除了一件事！每次它说shapesDraw / shapesFill.add（）时都会说：

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

如此接近！请回复。

Answer 1

您可以使用以下内容：

private class ShapeWrapper {

    private Color color;
    private Shape shape;

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

而非普通Shape用于存储Shape + Color。

然后把它们画成下一个：

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：根据您的例外情况，您尝试将类型列表（ShapeWrapper）添加到另一个类（Shape）的对象中，修复下一个方法：

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();
}

Java改变形状的颜色

1 个答案: