draw Arrow on Canvas - Android Graphics

Android examples for Graphics:Canvas

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Description

draw Arrow on Canvas

Demo Code


//package com.java2s;

import android.graphics.Canvas;

import android.graphics.Paint;

public class Main {

    public static void drawArrow(Canvas canvas, float startX, float startY,
            float stopX, float stopY, Paint paint) {

        float dx = (stopX - startX);
        float dy = (stopY - startY);
        float rad = (float) Math.atan2(dy, dx);

        canvas.drawLine(startX, startY, stopX, stopY, paint);
        canvas.drawLine(stopX, stopY,//from   w w  w .ja v  a2 s.c om
                (float) (stopX + Math.cos(rad + Math.PI * 0.75) * 20),
                (float) (stopY + Math.sin(rad + Math.PI * 0.75) * 20),
                paint);
        canvas.drawLine(stopX, stopY,
                (float) (stopX + Math.cos(rad - Math.PI * 0.75) * 20),
                (float) (stopY + Math.sin(rad - Math.PI * 0.75) * 20),
                paint);
    }
}

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