PhysicsEngine.js-2D/index2.html at master · marcustansoon/PhysicsEngine.js-2D · GitHub

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<!DOCTYPE html>
<html>


<body>


<h1>Using Physics Engine 2D to apply Kinematic Motion</h1>
<h2>Using p5 collision.js to check for collision between the bottom boundary and the canvas obj (coin)</h2>
<canvas id='canvas' height=500 width=700></canvas>
<script type="text/javascript" src="https://rawgit.com/marcustansoon/PhysicsEngine/master/src/PhysicsEngine.js"></script>
<script type="text/javascript" src='https://rawgit.com/marcustansoon/PhysicsEngine.js-2D/master/src/p5.collide2d.js'></script>
<div id = 'motion'></div>

<script>
PhysicsEngineTick.Start();//Start the Physics Engine Time Tick


var Canvas=document.getElementById('canvas');
var Context=Canvas.getContext('2d');//Get canvas


var stringB=[];
var stringA=[];

function Animation(){
		Context.clearRect(0, 0, Canvas.width, Canvas.height);	//clear canvas


		Context.font = "10px Arial";//set font size

        for (let x=0;x<=4;x++){//display motion status on canvas
		Context.fillText(stringA[x],Coin.x-40,Coin.y+x*10-20);
        Context.fillText(stringB[x],Coin.x+110,Coin.y+x*10-20);
        }

         Context.drawImage(CoinImage,//Image
            					0,		//Source Starting Point x
                                0,		//Source Starting Point y
                                CoinImage.height,//Image height
                                CoinImage.width,//Image width
                                Coin.x,//Position x of the image
                                Coin.y,//Position y of the image
                                CoinImage.height,//Image height
                                CoinImage.width//Image width
                                );


    Bounce();//Induce upward motion (bouncing ) when the Coin's height reaches certain point


	if (!Coin.CheckIfKinematicComponentExists('AnyName'))//Check if 'AnyName' component is removed
	{
		stringB[0]='Component Name		: AnyName -REMOVED-';
		stringB[1]='Velocity			: 0';
		stringB[2]='Acceleration		: 0';
		stringB[3]='Angle				: 0';
		stringB[4]='Motion Expire Time	: 0';
	}


    requestAnimationFrame(Animation);//Redraw canvas

}

function YourObj (x,y){//An Object with X and Y properties included
	this.x=x;
    this.y=y;//Both X and Y properties are REQUIRED!!!

    RegisterPhysicsObject.call(this);//Register the object so that kinematic motion can be attached to that object
}


//-------------------------------Must Inherit the engine prototype func!!!--------------------

YourObj.prototype = Object.create(RegisterPhysicsObject.prototype);//Inherit the Prototype properties of Physics Engine
YourObj.prototype.constructor = YourObj;//Inherit the Prototype properties of Physics Engine

//-------------------------------Must Inherit the engine prototype func!!!--------------------


var Coin = new YourObj(50,50);//Create an Object with x and  y properties

var CoinImage=new Image();//Create Image Object


CoinImage.src="http://img8.downloadapk.net/8/54/e5daa0_150.png";//Image src


var p5_collision = new p5();//using p5 collision detection


CoinImage.onload=function(){
	Animation();//Start the animation function

	stringB[0]='Component Name		: AnyName ';
	stringB[1]='Velocity			: 80';
	stringB[2]='Acceleration		: -8';
	stringB[3]='Angle				: 0';
	stringB[4]='Motion Expire Time	: 6seconds';

	//------------Parameters:--Name --Velocity--Acceleration--Angle in degree--Any Unique Name--Motion Expire Time---
    Coin.SetKinematicParameters("Add",80,-8,0,6,"AnyName");
    //Attach an Kinematic component to that Coin, with velocity of 80, acceleration of -8, Angle of Zero and 6 seconds expire countdown (Automatically remove this kinematic component after 6 seconds)


    stringA[0]='Component Name		: Bounce';
	stringA[1]='Velocity			: 0';
	stringA[2]='Acceleration		: 35';
	stringA[3]='Angle				: -90';
	stringA[4]='Motion Expire Time	: Permanent';
    Coin.SetKinematicParameters("Add",0,35,-90,0,"Bounce");//Attach Bounce acting downward(-90 degree) with acceleration of 9.8,


    //Note: Attaching kinematic component allows it to alter the x and y properties of the registered object, hence, it is necessary for that object to have both x and y properties before registeration of that object


}


function Bounce(){//Introduce upward motion

	if (p5_collision.collideLineRect(0,400,Canvas.width, 400, Coin.x,Coin.y,CoinImage.width,CoinImage.height)/*Coin.y>300*/ && Coin.CheckIfKinematicComponentExists('Bounce'))//Add bounce effect when coin height is above 400
    {
    	Coin.SetKinematicParameters("Change",115,-35,90,0,"Bounce");//Change the previously attached Bounce Component, by adding upward velocity, inducing bounce effect

		stringA[0]='Component Name		: Bounce';
		stringA[1]='Velocity			: 115';
		stringA[2]='Acceleration		: -35';
		stringA[3]='Angle				: 90';
		stringA[4]='Motion Expire Time	: Permanent';
    }
}

document.onkeydown = function(e)
{

	if (e.key===' ')//remove 'Bounce' component when space bar is pressed
	{
		console.log('Removed');	Coin.RemoveKinematicParameters("Bounce");//Remove 'Bounce' component

		stringA[0]='Component Name		: Bounce -REMOVED-';
		stringA[1]='Velocity			: 0';
		stringA[2]='Acceleration		: 0';
		stringA[3]='Angle				: 0';
		stringA[4]='Motion Expire Time	: 0';
	}
}

</script>
		<p style="color:green;font-size:15px;">To remove 'Bounce' motion, <strong>press Space Bar</strong></p>
<h3><a href="https://github.com/marcustansoon/PhysicsEngine.js-2D">Interested? Check out our Engine source code and Documentation</a></h3>
</body>
</html>