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Java example source code file (kaleidoscope.js)

This example Java source code file (kaleidoscope.js) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

animationtimerextend, array, borderpane, canvas, height, scene, stackpane, testname, width

The kaleidoscope.js Java example source code

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 * 
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 * 
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/**
 * Testing JavaFX canvas run by Nashorn.
 *
 * @test/nocompare
 * @run
 * @fork
 */

TESTNAME = "kaleidoscope";
        
var WIDTH = 800;
var HEIGHT = 600;
var canvas = new Canvas(WIDTH, HEIGHT);
var context = canvas.graphicsContext2D;

var x,y;
var p_x,p_y;
var a=0;
var b=0;
var angle=Math.PI/180*8;
var color=0;
var limit1=Math.PI*1.5;
var limit2=Math.PI*1.79;
var c=new Array(6);
var d=new Array(6);
var r,e;
var fade;
var prv_x,prv_y,prv_x2,prv_y2;
var isFrameRendered = false;

function renderFrame() {
	if (!isFrameRendered) {
        a=0.2*angle;
		b=0.7*angle;
		r=0;
		fade=32;
		for(var i=0;i<6;i++)
			{
			c[i]=1.0/(i+1)/2;
			d[i]=1.0/(i+1)/2;
			}
		radius=Math.round((WIDTH+HEIGHT)/8);
		e=radius*0.2;
		p_x=Math.round(WIDTH/2);
		p_y=Math.round(HEIGHT/2);
		x=(radius*c[0])*Math.cos(a*d[1])+(radius*c[2])*Math.sin(a*d[3])+(radius*c[4])*Math.sin(a*d[5]);
		y=(radius*c[5])*Math.sin(a*d[4])+(radius*c[3])*Math.cos(a*d[2])+(radius*c[1])*Math.cos(a*d[0]);
        isFrameRendered = true;
    }
    anim();
}

function anim() {
	var a1=Math.cos(a*2);
	var a2=Math.cos(a*4);
	var a3=Math.cos(a);
	var a4=Math.sin(a);
	if(b>limit1&&b<limit2) {
		r+=radius*0.02*a1;
		prv_x=x;
		prv_y=y;
		x=prv_x2+r*a3;
		y=prv_y2+r*a4;
	} else {
		prv_x=x;
		prv_y=y;
		prv_x2=x;
		prv_y2=y;
		x=(radius*c[0])*Math.cos(a*d[1])+(radius*c[2])*Math.sin(a*d[3])+(radius*c[4])*Math.sin(a*d[5]);
		y=(radius*c[5])*Math.sin(a*d[4])+(radius*c[3])*Math.cos(a*d[2])+(radius*c[1])*Math.cos(a*d[0]);
	}
	var c3=16*Math.cos(a*10);
	var c1=Math.floor(56*Math.cos(a*angle*4)+c3);
	var c2=Math.floor(56*Math.sin(a*angle*4)-c3);
	context.lineCap=StrokeLineCap.ROUND;
	context.setStroke(Paint.valueOf('rgba('+(192+c1)+','+(192+c2)+','+(192-c1)+','+(0.01-0.005*-a1)+')'));
	context.lineWidth=e*1.4+e*0.8*a3;
	draw_line(p_x,p_y,prv_x,prv_y,x,y);
	context.lineWidth=e+e*0.8*a3;
	draw_line(p_x,p_y,prv_x,prv_y,x,y);
	context.setStroke(Paint.valueOf('rgba('+(192+c1)+','+(192+c2)+','+(192-c1)+','+(0.06-0.03*-a1)+')'));
	context.lineWidth=e*0.6+e*0.35*a3;
	draw_line(p_x,p_y,prv_x,prv_y,x,y);
	context.setStroke(Paint.valueOf('rgba(0,0,0,0.06)'));
	context.lineWidth=e*0.4+e*0.225*a3;
	draw_line(p_x,p_y,prv_x,prv_y,x,y);
	context.setStroke(Paint.valueOf('rgba('+(192+c1)+','+(192+c2)+','+(192-c1)+','+(0.1-0.075*-a1)+')'));
	context.lineWidth=e*0.2+e*0.1*a3;
	draw_line(p_x,p_y,prv_x,prv_y,x,y);
	context.setStroke(Paint.valueOf('rgba(255,255,255,0.4)'));
	context.lineWidth=e*(0.1-0.05*-a2);
	draw_line(p_x,p_y,prv_x,prv_y,x,y);
	a+=angle*Math.cos(b);
	b+=angle*0.1;
}

function draw_line(x,y,x1,y1,x2,y2) {
	context.beginPath();
	context.moveTo(x+x1,y+y1);
	context.lineTo(x+x2,y+y2);
	context.moveTo(x-x1,y+y1);
	context.lineTo(x-x2,y+y2);
	context.moveTo(x-x1,y-y1);
	context.lineTo(x-x2,y-y2);
	context.moveTo(x+x1,y-y1);
	context.lineTo(x+x2,y-y2);
	context.moveTo(x+y1,y+x1);
	context.lineTo(x+y2,y+x2);
	context.moveTo(x-y1,y+x1);
	context.lineTo(x-y2,y+x2);
	context.moveTo(x-y1,y-x1);
	context.lineTo(x-y2,y-x2);
	context.moveTo(x+y1,y-x1);
	context.lineTo(x+y2,y-x2);
	context.moveTo(x,y+x2);
	context.lineTo(x,y+x1);
	context.moveTo(x,y-x2);
	context.lineTo(x,y-x1);
	context.moveTo(x+x2,y);
	context.lineTo(x+x1,y);
	context.moveTo(x-x2,y);
	context.lineTo(x-x1,y);
	context.stroke();
	context.closePath();
}

var stack = new StackPane();
var pane = new BorderPane();
pane.setCenter(canvas);
stack.getChildren().add(pane);
$STAGE.scene = new Scene(stack);
var frame = 0;
var timer = new AnimationTimerExtend() {
    handle: function handle(now) {
        if (frame < 800) {
            renderFrame();
            frame++;
        } else {
            checkImageAndExit();
            timer.stop();
        }
    }
};
timer.start();

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