Here you can find the source of drawArrow(Graphics g, double x0, double y0, double x1, double y1, double weight)
from to point to.
| Parameter | Description |
|---|---|
| g | Graphics context |
| x0 | X coordinate of arrow starting point |
| y0 | Y coordinate of arrow starting point |
| x1 | X coordinate of arrow ending point |
| y1 | Y coordinate of arrow ending point |
| weight | Arrow weight |
public static void drawArrow(Graphics g, double x0, double y0, double x1, double y1, double weight)
//package com.java2s; //License from project: Open Source License import java.awt.Color; import java.awt.Graphics; import java.awt.Point; import java.awt.Polygon; public class Main { /**/*from w w w. ja va 2 s . c o m*/ * Draws an arrow between two given points using the specified weight.<br> * The arrow is leading from point <code>from</code> to point <code>to</code>. * @param g Graphics context * @param from Arrow starting point * @param to Arrow ending point * @param weight Arrow weight */ public static void drawArrow(Graphics g, Point from, Point to, double weight) { drawArrow(g, from.getX(), from.getY(), to.getX(), to.getY(), weight); } /** * Draws an arrow between two points (specified by their coordinates) using the specified weight.<br> * The arrow is leading from point <code>from</code> to point <code>to</code>. * @param g Graphics context * @param x0 X coordinate of arrow starting point * @param y0 Y coordinate of arrow starting point * @param x1 X coordinate of arrow ending point * @param y1 Y coordinate of arrow ending point * @param weight Arrow weight */ public static void drawArrow(Graphics g, double x0, double y0, double x1, double y1, double weight) { int ix2, iy2, ix3, iy3; double sinPhi, cosPhi, dx, dy, xk1, yk1, xk2, yk2, s; dx = x1 - x0; dy = y1 - y0; int maxArrowWidth = 10; //arrow length s = Math.sqrt(dy * dy + dx * dx); //arrow head length int headLength = (int) Math.round(s * 0.5); double arrowAngle = Math.atan((double) (weight * maxArrowWidth) / headLength); double arrowAngle2 = Math.atan((double) maxArrowWidth / headLength); sinPhi = dy / s; // Winkel des Pfeils cosPhi = dx / s; // mit der X-Achse if (s < headLength) { // Der Pfeil x0 = x1 - headLength * cosPhi; // .. darf nicht kuerzer y0 = y1 - headLength * sinPhi; // .. als die Spitze sein } xk1 = -headLength * Math.cos(arrowAngle); // Koordinaten yk1 = headLength * Math.sin(arrowAngle); // .. der Pfeilspitze xk2 = -headLength * Math.cos(arrowAngle2); // Koordinaten yk2 = headLength * Math.sin(arrowAngle2); ix2 = (int) (x1 + xk1 * cosPhi - yk1 * sinPhi); // Pfeilspitze iy2 = (int) (y1 + xk1 * sinPhi + yk1 * cosPhi); // .. um Winkel Phi ix3 = (int) (x1 + xk1 * cosPhi + yk1 * sinPhi); // .. rotieren iy3 = (int) (y1 + xk1 * sinPhi - yk1 * cosPhi); // .. und translatieren Color c = g.getColor(); g.setColor(Color.black); g.drawLine((int) x0, (int) y0, (int) x1, (int) y1); // Pfeilachse Polygon p = new Polygon(); p.addPoint((int) x1, (int) y1); p.addPoint((int) ix2, (int) iy2); p.addPoint((int) ix3, (int) iy3); g.setColor(c); g.fillPolygon(p); g.setColor(Color.black); g.drawPolygon(p); g.drawLine((int) (x1 + xk2 * cosPhi - yk2 * sinPhi), (int) (y1 + xk2 * sinPhi + yk2 * cosPhi), (int) (x1 + xk2 * cosPhi + yk2 * sinPhi), iy3 = (int) (y1 + xk2 * sinPhi - yk2 * cosPhi)); } }