自定义Java Swing Meter控件
我想做一个定制的摆动控制,一米。 箭头会上下移动。这是我目前的代码,但我觉得我做错了自定义Java Swing Meter控件,java,swing,controls,Java,Swing,Controls,我想做一个定制的摆动控制,一米。 箭头会上下移动。这是我目前的代码,但我觉得我做错了 import java.awt.BasicStroke; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.LinearGradientPaint; import java.awt.Polygon; import java.awt.Stroke; import java.aw
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.LinearGradientPaint;
import java.awt.Polygon;
import java.awt.Stroke;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class meter extends JFrame {
Stroke drawingStroke = new BasicStroke(2);
Rectangle2D rect = new Rectangle2D.Double(105, 50, 40, 200);
Double meterPercent = new Double(0.57);
public meter() {
setTitle("Meter");
setLayout(null);
setSize(300, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public void paint(Graphics g) {
// Paint Meter
Graphics2D g1 = (Graphics2D) g;
g1.setStroke(drawingStroke);
g1.draw(rect);
// Set Meter Colors
Point2D start = new Point2D.Float(0, 0);
Point2D end = new Point2D.Float(0, this.getHeight());
float[] dist = { 0.1f, 0.5f, 0.9f };
Color[] colors = { Color.green, Color.yellow, Color.red };
LinearGradientPaint p = new LinearGradientPaint(start, end, dist,
colors);
g1.setPaint(p);
g1.fill(rect);
// Make a triangle - Arrow on Meter
int[] x = new int[3];
int[] y = new int[3];
int n; // count of points
// Set Points for Arrow
Integer meterArrowHypotenuse = (int) rect.getX();
Integer meterArrowTip = (int) rect.getY()
+ (int) (rect.getHeight() * (1 - meterPercent));
x[0] = meterArrowHypotenuse - 25;
x[1] = meterArrowHypotenuse - 25;
x[2] = meterArrowHypotenuse - 5;
y[0] = meterArrowTip - 20; // Top Left
y[1] = meterArrowTip + 20; // Bottom Left
y[2] = meterArrowTip; // Tip of Arrow
n = 3; // Number of points, 3 because its a triangle
// Draw Arrow Border
Polygon myTriShadow = new Polygon(x, y, n); // a triangle
g1.setPaint(Color.black);
g1.fill(myTriShadow);
// Set Points for Arrow Board
x[0] = x[0] + 1;
x[1] = x[1] + 1;
x[2] = x[2] - 2;
y[0] = y[0] + 3;
y[1] = y[1] - 3;
y[2] = y[2];
Robot robot = new Robot();
Color colorMeter = robot.getPixelColor(x[2]+10, y[2]);
// Draw Arrow
Polygon myTri = new Polygon(x, y, n); // a triangle
Color colr = new Color(colorMeter.getRed(), colorMeter.getGreen(), colorMeter.getBlue());
g1.setPaint(colr);
g1.fill(myTri);
}
public static void main(String[] args) {
new meter();
}
}
感谢您的关注。您可以使用a和
设置值(int n)
在需要时设置值。您也可以,因此您可以根据需要获得箭头和渐变。除了@Jonas示例之外,您可能还想看看这篇文章
附录:经过反思,它看起来有点吓人,但您可以扩展BasicSliderUI
,并在paintThumb()
和paintrack()中重用一些代码
但是我需要使用图形,它必须是彩色的和漂亮的。我可以重画JSlider吗?@Tyler:是的,我用链接更新了我的答案。如果需要,可以扩展和更改所有Swing组件的设计。
JSlider slider = new JSlider();
slider.setUI(new MySliderUI(slider));
...
private static class MySliderUI extends BasicSliderUI {
public MySliderUI(JSlider b) {
super(b);
}
@Override
public void paintTrack(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
Rectangle r = trackRect;
g2d.setPaint(new GradientPaint(
r.x, r.y, Color.red, r.x + r.width, r.y + r.height, Color.blue));
g.fillRect(r.x, r.y, r.width, r.height);
}
@Override
public void paintThumb(Graphics g) {
super.paintThumb(g); // replace with your fill()
}
}