Canvas buffer

Developer
Darby Rathbone
Size
2,791 Kb
Views
34,408
  1. Canvas buffer Previews
  2. Canvas buffer HTML Codes
  3. Canvas buffer CSS Codes
  4. Canvas buffer JS Codes

How do I make an canvas buffer?

I draw a simple shape on one canvas and then i redraw it on an another canvas after performing transformations so it doesn't have to be rendered again.. What is a canvas buffer? How do you make a canvas buffer? This script and codes were developed by Darby Rathbone on 03 October 2022, Monday.

Canvas buffer Previews
IQ Test

Canvas buffer - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>canvas buffer </title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <script src="js/index.js"></script>
</body>
</html>

Canvas buffer - Script Codes CSS Codes

html, body { width: 100%; height: 100%; margin: 0px;
}
canvas{ position:absolute; top:0px; left:0px; bottom:0px; right:0px;
}

Canvas buffer - Script Codes JS Codes

var Vector = (function () { Vector.add = function (v1, v2) { return new Vector(v1.x + v2.x, v1.y + v2.y); }; Vector.sub = function (v1, v2) { return new Vector(v1.x - v2.x, v1.y - v2.y); }; Vector.project = function (v1, v2) { return v1.clone().scale((v1.dot(v2)) / v1.magSq()); }; function Vector(x, y) { this.x = x !== null ? x : 0; this.y = y !== null ? y : 0; } Vector.prototype.set = function (x, y) { this.x = x; this.y = y; return this; }; Vector.prototype.add = function (v) { this.x += v.x; this.y += v.y; return this; }; Vector.prototype.sub = function (v) { this.x -= v.x; this.y -= v.y; return this; }; Vector.prototype.scale = function (f) { this.x *= f; this.y *= f; return this; }; Vector.prototype.dot = function (v) { return this.x * v.x + this.y * v.y; }; Vector.prototype.cross = function (v) { return (this.x * v.y) - (this.y * v.x); }; Vector.prototype.mag = function () { return Math.sqrt(this.x * this.x + this.y * this.y); }; Vector.prototype.magSq = function () { return this.x * this.x + this.y * this.y; }; Vector.prototype.dist = function (v) { var dx, dy; dx = v.x - this.x; dy = v.y - this.y; return Math.sqrt(dx * dx + dy * dy); }; Vector.prototype.distSq = function (v) { var dx, dy; dx = v.x - this.x; dy = v.y - this.y; return dx * dx + dy * dy; }; Vector.prototype.norm = function () { var m; m = Math.sqrt(this.x * this.x + this.y * this.y); this.x /= m; this.y /= m; return this; }; Vector.prototype.limit = function (l) { var m, mSq; mSq = this.x * this.x + this.y * this.y; if (mSq > l * l) { m = Math.sqrt(mSq); this.x /= m; this.y /= m; this.x *= l; this.y *= l; return this; } }; Vector.prototype.copy = function (v) { this.x = v.x; this.y = v.y; return this; }; Vector.prototype.clone = function () { return new Vector(this.x, this.y); }; Vector.prototype.clear = function () { this.x = 0; this.y = 0; return this; }; return Vector;
})();
var force = function(o1,o2,v){ var o1m = o1.getMass(); var o2m = o2.getMass(); var tm = o1m+o2m; o1.velocity.x += o1m*v.x/tm; o1.velocity.y += o1m*v.y/tm; o2.velocity.x -= o2m*v.x/tm; o2.velocity.y -= o2m*v.y/tm;
};
var canvas2 = document.createElement('canvas');
var context2 = canvas2.getContext('2d');
canvas2.width =700;
canvas2.height = 700;
canvas2.style.border = "5px ridge";
canvas2.style.padding = "auto";
canvas2.style.margin = 'auto';
canvas2.style.position = "fixed";
canvas2.style.bottom = "0px";
canvas2.style.right = "0px";
canvas2.style.top = "0px";
canvas2.style.left = "0px";
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
//document.body.style['overflow'] = 'hidden';
canvas.width =700;
canvas.height = 700;
context.lineWidth =5;
context.strokeStyle = "#111";
canvas.style.border = "5px ridge";
canvas.style.padding = "auto";
canvas.style.margin = 'auto';
canvas.style.position = "fixed";
canvas.style.bottom = "0px";
canvas.style.right = "0px";
canvas.style.top = "0px";
canvas.style.left = "0px";
document.body.appendChild(canvas);
context.save();
context.translate(canvas.width/2.0,canvas.height/2.0);
for(var i =0;i<360;i+=5){ //context.translate(i0,i); context.beginPath(); context.rotate(i*Math.PI/25.0); //context.moveTo(0,0); context.save(); for(var j =0.0;j<175;j+=5){ if(j<175/2) context.rotate(-j/1080.0); else context.rotate(-(j-(i/10))/1080.0); context.lineTo(j,j); context.moveTo(j,j); } context.closePath(); context.restore(); //context.fill(); context.stroke(); context.rotate(i*Math.PI/25.0); //context.translate(-i,-i);
}
context2.drawImage(canvas,0,0);
requestAnimationFrame(function animator(){ context.restore();
context.globalAlpha =.1; context.fillStyle = "#fff"; context.fillRect(0,0,canvas.width,canvas.height); context.translate(canvas.width/2.0,canvas.height/2.0); context.rotate(Math.PI/(2*90.0)); context.translate(-canvas.width/2.0,-canvas.height/2.0); //context.translate(-canvas.width/2.0,-canvas.height/2.0); context.globalAlpha = 1; context.drawImage(canvas2,0,0); requestAnimationFrame(animator);
// });
Canvas buffer - Script Codes
Canvas buffer - Script Codes
Home Page Home
Developer Darby Rathbone
Username blackkbot
Uploaded October 03, 2022
Rating 3
Size 2,791 Kb
Views 34,408
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