我想知道如何绘制多条线,看起来像是将面板划分为扇区。
This is the example of lines that I wanted to draw
以下代码到目前为止我已经弄明白但它只能在面板上绘制“x”线和一条水平线。我想知道如何画出如上图所示的线条。
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D graphic = (Graphics2D)g;
Insets insets = getInsets();
graphic.setStroke(new BasicStroke(5.0f));
graphic.draw(new Line2D.Double(insets.left, insets.top,getWidth()-insets.right, getHeight()-insets.bottom));
graphic.draw(new Line2D.Double(insets.left,getHeight()-insets.bottom,getWidth()-insets.right,insets.top));
graphic.drawLine(0,200,800,200);
}
谢谢。
答案 0 :(得分:1)
你可能有几种方法可以做到这一点,但对我来说,这看起来就像一个轮子上的辐条,而且因为我知道如何计算一个圆点,这就是我回归的地方。
我们知道什么:
因此,利用这些基本信息,我们可以设计出在中心点周围均匀绘制分割数所需的角度增量
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
protected Point2D pointAt(double radians, double radius) {
double x = radius * Math.cos(radians);
double y = radius * Math.sin(radians);
return new Point2D.Double(x, y);
}
protected Point2D translate(Point2D point, Point2D to) {
Point2D newPoint = new Point2D.Double(point.getX(), point.getY());
newPoint.setLocation(point.getX() + to.getX(), point.getY() + to.getY());
return newPoint;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(Color.BLACK);
double startAngle = 0;
double divisions = 12;
double delta = 360.0 / divisions;
int centerX = getWidth() / 2;
int centerY = getHeight() / 2;
int radius = Math.min(centerX, centerY) * 2; // Overshoot the visible bounds
Point2D centerPoint = new Point2D.Double(centerX, centerY);
double angle = startAngle;
for (int index = 0; index < divisions; index++) {
Point2D point = pointAt(Math.toRadians(angle), radius);
point = translate(point, centerPoint);
g2d.draw(new Line2D.Double(centerPoint, point));
angle += delta;
}
g2d.dispose();
}
}
}
现在,如果你不想让这些行“过冲”,那就改变
int radius = Math.min(centerX, centerY) * 2; // Overshoot the visible bounds
到
int radius = Math.min(centerX, centerY);
现在,如果你希望它看起来有点“更好”,你可以考虑添加
RenderingHints hints = new RenderingHints(
RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHints(hints);
在绘制任何内容之前进入paintComponent
方法