Question

我想使用我所拥有的线类为我的程序制作一个填充桶工具。我的填充桶会记录为了填充区域而需要绘制的所有线条，例如：

http://i.imgur.com/Cywh8xU.png - 在此图片中，我点击的点是红色圆圈，而不是每条线都会找到2个点（起点和终点）。我显然没有画出所有的线条，但那是我所拥有的基本概念。

我遇到的问题是图像看起来像这样，我无法弄清楚原因。 http://i.imgur.com/IXHgEf2.jpg

这是我到目前为止查找所有行的代码：

公共类FillBucket {

private BufferedImage image;
private Fill currentFill;
private Line currentLine;

private Queue<Point> pointsToVisit;

@Override
public void mousePressed(Point point) {
    super.mousePressed(point);

    if(pointIsOnCanvas(point)) {
        image = new BufferedImage(getCanvas().getPreferredSize().width, getCanvas().getPreferredSize().height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        getCanvas().paint(g2);

        currentFill = new Fill(getColor());
        pointsToVisit = new LinkedList<>();
        createPoints(point, image.getRGB(point.x, point.y));

        getCanvas().addDrawable(currentFill);
        getCanvas().repaint();
    }
}

private void createPoints(Point clickedPoint, int clickedColor) {
    pointsToVisit.add(clickedPoint);

    while(!pointsToVisit.isEmpty()) {
        Point testPoint = pointsToVisit.poll();

        if(testPoint.x > 0 && testPoint.x < image.getWidth() && testPoint.y > 0 && testPoint.y < image.getHeight() 
                && image.getRGB(testPoint.x, testPoint.y) == clickedColor) {
            while(testPoint.x > 0 && image.getRGB(testPoint.x, testPoint.y) == clickedColor) {
                testPoint.x--;
            }
            currentLine = new Line(getColor(), 5);
            currentLine.addPoint(new Point(testPoint));
            while(testPoint.x < image.getWidth() && image.getRGB(testPoint.x, testPoint.y) == clickedColor) {
                pointsToVisit.add(new Point(testPoint.x, testPoint.y+1));
                pointsToVisit.add(new Point(testPoint.x, testPoint.y-1));

                image.setRGB(testPoint.x, testPoint.y, getColor().getRGB());
                testPoint.x++;
            }
            currentLine.addPoint(new Point(testPoint));
            currentFill.addLine(currentLine);
        }
    }
}

}

以下是我的线类的基础知识：

public class Line {
private List<Point> points;
private int width;

/**
 * Create a Line
 * @param color - The color of the line
 * @param width - The width of the line
 */
public Line(Color color, int width){
    points = new LinkedList<>();
    setColor(color);
    setWidth(width);
}

/**
 * Add a Point to the Line
 * @param p - The Point to add to the Line 
 */
public void addPoint(Point p) {
    points.add(p);
}

@Override
public void draw(Graphics2D g2) {
    super.draw(g2);
    g2.setStroke(new BasicStroke(getWidth(), BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
    for(int i=1; i<points.size(); i++)
        g2.drawLine(points.get(i-1).x, points.get(i-1).y, points.get(i).x, points.get(i).y);
}

}

这是我的Fill课程：

public class Fill{

List<Line> lines;

/**
 * Create a Fill
 * @param color - The Color of the Fill
 */
public Fill(Color color){
    lines = new LinkedList<>();
    setColor(color);
}

/**
 * Add a Line to the Fill
 * @param l - The Line to add
 */
public void addLine(Line l) {
    lines.add(l);
}

@Override
public void draw(Graphics2D g2) {
    super.draw(g2);
    for(Line l: lines) {
        l.draw(g2);
    }
}

任何帮助将不胜感激，谢谢。

Answer 1

您需要将createPoints(...)功能更改为：

private void createPoints(Point clickedPoint, int clickedColor) {
    pointsToVisit.add(clickedPoint);

    while(!pointsToVisit.isEmpty()) {
        Point testPoint = pointsToVisit.poll();

        if(testPoint.x >= 0 && testPoint.x < image.getWidth() && testPoint.y >= 0 && testPoint.y < image.getHeight() 
            && image.getRGB(testPoint.x, testPoint.y) == clickedColor) {
            while(testPoint.x > 0 && image.getRGB(testPoint.x-1, testPoint.y) == clickedColor) {
                testPoint.x--;
            }
            currentLine = new Line(getColor(), 5);
            currentLine.addPoint(new Point(testPoint));

            pointsToVisit.add(new Point(testPoint.x, testPoint.y+1));
            pointsToVisit.add(new Point(testPoint.x, testPoint.y-1));

            image.setRGB(testPoint.x, testPoint.y, getColor().getRGB());

            while(testPoint.x < image.getWidth()-1 && image.getRGB(testPoint.x+1, testPoint.y) == clickedColor) {
                pointsToVisit.add(new Point(testPoint.x, testPoint.y+1));
                pointsToVisit.add(new Point(testPoint.x, testPoint.y-1));

                image.setRGB(testPoint.x, testPoint.y, getColor().getRGB());
                testPoint.x++;
            }
            currentLine.addPoint(new Point(testPoint));
            currentFill.addLine(currentLine);
        }
    }
}

（我在您的=条件中添加了几个if - 符号，以便您也可以点击图片的左上角，以及几个+1和-1进入while条件以修复下面描述的错误

基本上，发生的事情是在你的第一个while循环之后你或者在图像的左边缘，在这种情况下一切正常，或者你的testPoint指向第一个不等于clickedColor的像素此外，在这种情况下，你的第二个while循环立即终止。

BTW：如果你点击已经设置为填充颜色的点（例如clickedColor == getColor()），你的代码可能会锁定。

使用线创建填充铲斗工具

1 个答案: