package mage.client.util.gui;
import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Area;
import java.awt.geom.GeneralPath;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Arrow extends JPanel {
private static final long serialVersionUID = -4631054277822828303L;
private int startX;
private int startY;
private int endX;
private int endY;
private int bodyWidth = 10;
private float headSize = 17;
private Composite composite;
private Color color = Color.red;
public Arrow () {
setOpaque(false);
setOpacity(0.6f);
}
protected void paintComponent (Graphics g) {
super.paintComponent(g);
float ex = endX - startX;
float ey = endY - startY;
if (ex == 0 && ey == 0) return;
float length = (float)Math.sqrt(ex * ex + ey * ey);
float bendPercent = (float)Math.asin(ey / length);
if (endX > startX) bendPercent = -bendPercent;
Area arrow = getArrow(length, bendPercent);
Graphics2D g2d = (Graphics2D)g;
g2d.translate(startX, startY);
g2d.rotate(Math.atan2(ey, ex));
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setComposite(composite);
g2d.setColor(this.color);
g2d.fill(arrow);
g2d.setColor(Color.BLACK);
g2d.draw(arrow);
}
private Area getArrow (float length, float bendPercent) {
float p1x = 0, p1y = 0;
float p2x = length, p2y = 0;
float cx = length / 2, cy = length / 8f * bendPercent;
float adjSize, ex, ey, abs_e;
adjSize = (float)(bodyWidth / 2 / Math.sqrt(2));
ex = p2x - cx;
ey = p2y - cy;
abs_e = (float)Math.sqrt(ex * ex + ey * ey);
ex /= abs_e;
ey /= abs_e;
GeneralPath bodyPath = new GeneralPath();
bodyPath.moveTo(p2x + (ey - ex) * adjSize, p2y - (ex + ey) * adjSize);
bodyPath.quadTo(cx, cy, p1x, p1y - bodyWidth / 2);
bodyPath.lineTo(p1x, p1y + bodyWidth / 2);
bodyPath.quadTo(cx, cy, p2x - (ey + ex) * adjSize, p2y + (ex - ey) * adjSize);
bodyPath.closePath();
adjSize = (float)(headSize / Math.sqrt(2));
ex = p2x - cx;
ey = p2y - cy;
abs_e = (float)Math.sqrt(ex * ex + ey * ey);
ex /= abs_e;
ey /= abs_e;
GeneralPath headPath = new GeneralPath();
headPath.moveTo(p2x - (ey + ex) * adjSize, p2y + (ex - ey) * adjSize);
headPath.lineTo(p2x, p2y);
headPath.lineTo(p2x + (ey - ex) * adjSize, p2y - (ex + ey) * adjSize);
headPath.closePath();
Area area = new Area(headPath);
area.add(new Area(bodyPath));
return area;
}
public int getBodyWidth () {
return bodyWidth;
}
public void setBodyWidth (int bodyWidth) {
this.bodyWidth = bodyWidth;
}
public float getHeadSize () {
return headSize;
}
public void setHeadSize (float headSize) {
this.headSize = headSize;
}
public void setArrowLocation (int startX, int startY, int endX, int endY) {
this.startX = startX;
this.startY = startY;
this.endX = endX;
this.endY = endY;
repaint();
}
public void setOpacity (float opacity) {
composite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, opacity);
}
public void setColor(Color color) {
this.color = color;
}
public static void main (String[] args) {
final JFrame frame = new JFrame();
frame.setLayout(new BorderLayout());
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
final Arrow arrow = new Arrow();
frame.add(arrow, BorderLayout.CENTER);
frame.setSize(640, 480);
frame.setResizable(false);
frame.setVisible(true);
frame.getContentPane().addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved (MouseEvent e) {
arrow.setArrowLocation(320, 240, e.getX(), e.getY());
}
public void mouseDragged (MouseEvent e) {
}
});
}
}