java - 绘制时计算线条粗细

我可以画线，但是厚度是恒定的。按下按钮时需要更改厚度。在此示例中，按“ w”将增加厚度，按“ q”将减小厚度。

import java.awt.*;
import java.applet.*;

import sun.swing.SwingUtilities2;

public class draw extends Applet {

    boolean isBlack = true;
    Point startPoint;
    Point points[];
    int numPoints;
    boolean drawing;
    int n = 0;

    @Override
    public void init() {
        startPoint = new Point(0, 0);
        points = new Point[10000];
        drawing = false;
        resize(300, 400);
    }

    @Override
    public void paint(Graphics g) {

        if (n == 0) {
            g.setColor(Color.red);
        }
        if (n == 1) {
            g.setColor(Color.green);
        }
        if (n == 2) {
            g.setColor(Color.blue);
        }
        if (n == 3) {
            g.setColor(Color.black);
        }

        int oldX = startPoint.x;
        int oldY = startPoint.y;
        for (int i = 0; i < numPoints; ++i) {
            g.drawLine(oldX, oldY, points[i].x, points[i].y);
            oldX = points[i].x;
            oldY = points[i].y;
        }
    }

    @Override
    public boolean keyDown(Event evt, int key) {
        char keyChar = (char) key;

        if (keyChar == 'w') {
            n++;
            if (n > 3) {
                n = 0;
            }
        }
        if (keyChar == 'q') {
            n--;
            if (n < 0) {
                n = 3;
            }
        }

        return true;
    }

    @Override
    public boolean mouseDown(Event evt, int x, int y) {

        if (!drawing) {
            startPoint.x = x;
            startPoint.y = y;
        }
        drawing = !drawing;
        return true;
    }

    @Override
    public boolean mouseMove(Event evt, int x, int y) {
        if ((drawing) && (numPoints < 10000)) {
            points[numPoints] = new Point(x, y);
            ++numPoints;
            repaint();
        }
        return true;
    }
}

但是我无法计算线的粗细，我该怎么做？

最佳答案

您需要使用Graphics2D软件包：

Graphics2D g2 = SwingUtilities2.getGraphics2D(g);
g2.setStroke(new BasicStroke(n));
g2.drawLine(oldX, oldY, points[i].x, points[i].y);

我认为这就是您所需要的。自从我使用它已经有一段时间了。

关于java - 绘制时计算线条粗细，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32603259/