phis/test.html at master · GotBinGo/phis · GitHub

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<canvas id="can" width= "500" height="500" style="border:1px solid black;"></canvas>
<br>
<input type="text" name="fname">

<script>
var alldraw = true;
var uidcounter = 0;
var kaa, kab;
function getUid()
{
	uidcounter++;
	return uidcounter;
}
function point(x,y)
{
	this.x = x;
	this.y = y;
}
function line(x1,y1,x2,y2)
{
	this.x1 = x1;
	this.x2 = x2;
	this.y1 = y1;
	this.y2 = y2;
	this.m = function()
			{
		xd = this.x2-this.x1;
		yd = this.y2-this.y1;
		return yd/xd;
	};
	this.off = function ()
	{
		var ma = this.m();

		if (ma == Infinity || ma == -Infinity)
			return this.x1;
		return this.y2 - this.x2* ma;
	};
	this.draw = function()
	{
		this.ctx.beginPath();
		this.ctx.moveTo(this.x1,500-this.y1);
		this.ctx.lineTo(this.x2,500-this.y2);
		this.ctx.stroke();
	};
	this.inter = function (line)
	{
		var a = (line.off()-this.off());
		var b = (this.m()-line.m());

		var x = a/b;
		/*if (b == Infinity || b == -Infinity)
			x = a;*/
		if(b == Infinity || b == -Infinity)
			x = this.x2;
		var p = new point(x,line.m()*x+line.off());

		if(p.y == -Infinity || p.y == Infinity)
		{
			x = line.x2;
			var p = new point(x,this.m()*x+this.off());
		//	p.y  = this.m()*x+this.off()
		}
		kaa = p.x;
		kab = line.m();
		p.m1 = this.m();
		p.m2 = line.m();
		return p;
	};
}
function circle(x,y,r)
{
	this.x = x;
	this.y = y;
	this.r = r;
	this.vx = 0;
	this.vy = 0;

	this.draw = function()
	{
		this.ctx.beginPath();
		this.ctx.arc(this.x,500-this.y,this.r,0,2*Math.PI);
		this.ctx.stroke();
	};
	this.move = function(objs)
	{
		this.x += this.vx;
		this.y += this.vy;
	};
}
var c = document.getElementById("can");
window.addEventListener("keydown", asdd,true);
function asdd(e)
{
document.title = e.keyCode;
	if ( e.keyCode == 37)
	{
		a.x1 --;
	}
	if ( e.keyCode == 38)
	{
		a.y1 ++;
	}
	if ( e.keyCode == 39)
	{
		a.x1 ++;
	}
	if ( e.keyCode == 40)
	{
		a.y1 --;
	}

	if ( e.keyCode == 65)
	{
		a.x2 --;
	}
	if ( e.keyCode == 87)
	{
		a.y2 ++;
	}
	if ( e.keyCode == 68)
	{
		a.x2 ++;
	}
	if ( e.keyCode == 83)
	{
		a.y2 --;
	}
}
ctx = c.getContext("2d");
ctx.font = '10pt Calibri';
line.prototype.ctx = ctx;
circle.prototype.ctx = ctx;
setInterval(frame,20);
a = new line(50,100,50,50);
b = new line(50,50,100,100);
c = new circle(10,10,5);
b.vx = 1;
function frame()
{
	//clear
	//c.width = c.width;

	ctx.fillStyle="white";
	ctx.fillRect(0,0,500,500);
	ctx.fillStyle="black";
	//end clear

	//update
	//c.move();
	p = a.inter(b);


	//end update

	//draw
	a.draw();
	b.draw();

	new circle(a.x1,a.y1,3).draw();
	new circle(p.x,p.y,5).draw();
	/*if(p.m1 < 0)
		new line(p.x,p.y,p.x+10,p.y+(-(p.m2-p.m1))*10).draw();
	else
		new line(p.x,p.y,p.x-10,p.y-(-(p.m2-p.m1))*10).draw();
	*/
	ctx.fillText(p.m1,10,20);
	ctx.fillText(p.m2,10,30);
	//end draw
}
</script>