Asteriod Field

Developer
Andi Smithers
Size
5,554 Kb
Views
12,144
  1. Asteriod Field Previews
  2. Asteriod Field HTML Codes
  3. Asteriod Field CSS Codes
  4. Asteriod Field JS Codes

How do I make an asteriod field?

Taking the icosahedron we deform the vertices randomly for each asteriod giving a unique shape to each one. We then give it some rotational component and then collide them with each other to create a nice bouncing action. . What is a asteriod field? How do you make a asteriod field? This script and codes were developed by Andi Smithers on 21 November 2022, Monday.

Asteriod Field Previews
IQ Test

Asteriod Field - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Asteriod Field</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <body> <canvas id='asteroid field 3d'></canvas>
</body> <script src="js/index.js"></script>
</body>
</html>

Asteriod Field - Script Codes CSS Codes

body{ background:#000000; margin: 0px; padding: 0px;
}

Asteriod Field - Script Codes JS Codes

/*****************************************************************************
The MIT License (MIT)
Copyright (c) 2014 Andi Smithers
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*****************************************************************************/
// conceptualized and written by andi smithers
// constants
const focalDepth = 80;
const focalPoint = 256;
const maxAsteriods = 32;
var localSpaceCubed = 10;
// variables
var centreX;
var centreY;
var mouseX;
var mouseY;
var spawnX;
var spawnY;
var frameCount=0;
var shieldUp;
var splutterCount=0;
var splutterNoise=60;
var spawnTime;
// matrix
var orientation = new matrix3x3();
// basic matrices 3x3
function matrix3x3()
{ // set as identiy this.m = [1,0,0,0,1,0,0,0,1];
}
matrix3x3.prototype.clone = function(matrix)
{ this.m = matrix.m.slice(0);
}
matrix3x3.prototype.rotateX = function(angle)
{ var c = Math.cos(angle); var s = Math.sin(angle); this.m = [1,0,0,0,c,-s,0, s, c];
}
matrix3x3.prototype.rotateY = function(angle)
{ var c = Math.cos(angle); var s = Math.sin(angle); this.matrix = [c,0,s,0,1,0,-s, 0, c];
}
matrix3x3.prototype.rotateZ = function(angle)
{ var c = Math.cos(angle); var s = Math.sin(angle); this.m = [c,-s,0,s,c,0,0,0,1];
}
matrix3x3.prototype.multiply = function(matrix)
{ var m1 = this.m; var m2 = matrix.m; return {m:[m1[0] * m2[0] + m1[1] * m2[3] + m1[2] * m2[6], m1[0] * m2[1] + m1[1] * m2[4] + m1[2] * m2[7], m1[0] * m2[2] + m1[1] * m2[5] + m1[2] * m2[8], m1[3] * m2[0] + m1[4] * m2[3] + m1[5] * m2[6], m1[3] * m2[1] + m1[4] * m2[4] + m1[5] * m2[7], m1[3] * m2[2] + m1[4] * m2[5] + m1[5] * m2[8], m1[6] * m2[0] + m1[7] * m2[3] + m1[8] * m2[6], m1[6] * m2[1] + m1[7] * m2[4] + m1[8] * m2[7], m1[6] * m2[2] + m1[7] * m2[5] + m1[8] * m2[8]] };
}
matrix3x3.prototype.transform = function(tx, ty, tz)
{ return {x:tx*this.m[0]+ty*this.m[1]+tz*this.m[2], y:tx*this.m[3]+ty*this.m[4]+tz*this.m[5], z:tx*this.m[6]+ty*this.m[7]+tz*this.m[8]};
}
// asteriods
var asteriods = [];
function SetupAsteriods()
{ asteriods = []; for (var i=0; i<maxAsteriods; i++) { asteriods.push(new Asteriod()) } var d = new Date(); spawnTime = d.getTime() + 30000;
}
function RenderAsteriods()
{ for (var i=0; i<asteriods.length;i++) { asteriods[i].render(); }
}
function CompareRoids(a,b)
{ return b.z - a.z;
}
function UpdateAsteriods()
{ for (var i=0; i<asteriods.length;i++) { asteriods[i].update(); } // should really broadphase but 32x32 checks is not awful for (var i=0; i<asteriods.length;i++) { var src = asteriods[i]; for (var j=i+1; j<asteriods.length;j++) { var dst = asteriods[j]; var dx = dst.x-src.x; var dy = dst.y-src.y; var dz = dst.z-src.z; if (dx*dx + dy*dy + dz*dz < 2) { dst.angVel.y*=-1; dst.angVel.p*=-1; src.angVel.y*=-1; src.angVel.p*=-1; } } } asteriods.sort(CompareRoids);
}
function Asteriod()
{ this.init();
}
Asteriod.prototype.init = function()
{ this.asteroidVerts = []; this.x = Math.random()*localSpaceCubed-localSpaceCubed*0.5; this.y = Math.random()*localSpaceCubed-localSpaceCubed*0.5; this.z = Math.random()*localSpaceCubed-localSpaceCubed*0.5; this.angVel = {y:(Math.random()-0.5)*Math.PI/120, p:(Math.random()-0.5)*Math.PI/120, r:(Math.random()-0.5)*Math.PI/120}; this.rotation = new matrix3x3(); // fetch the icosahedron data and morph it for (var i=0; i< icosahedronVerts.length; i++) { var deform = Math.random()*1.0-0.5; var x = icosahedronVerts[i].x + icosahedronVerts[i].x * deform; var y = icosahedronVerts[i].y + icosahedronVerts[i].y * deform; var z = icosahedronVerts[i].z + icosahedronVerts[i].z * deform; this.asteroidVerts[i] = {x:x, y:y, z:z}; }
}
Asteriod.prototype.update = function()
{ var matrixY = new matrix3x3(); var matrixP = new matrix3x3(); var matrixR = new matrix3x3(); matrixY.rotateZ(this.angVel.y); matrixP.rotateX(this.angVel.p); matrixR.rotateY(this.angVel.r); this.rotation.clone(this.rotation.multiply(matrixR.multiply(matrixP.multiply(matrixY)))); this.x += this.angVel.p; this.y += this.angVel.r; this.z += this.angVel.y;
}
Asteriod.prototype.render = function()
{ var scale = 512/canvas.height; var transforms = []; var cphi = Math.cos(phi); var sphi = Math.sin(phi); var ctheta = Math.cos(theta); var stheta = Math.sin(theta); // transform into 3d coords for (var i=0; i<this.asteroidVerts.length; i++) { var vert = this.asteroidVerts[i]; var t = this.rotation.transform(vert.x, vert.y, vert.z);
/* var tz = vert.z * ctheta + vert.y * stheta; var ty = vert.y * ctheta - vert.z * stheta; // rotate phi var tx = vert.x * cphi - ty * sphi; ty = ty * cphi + vert.x * sphi; */ t.x +=this.x; t.y +=this.y; t.z +=this.z; // pixel depth using a long focal distance to ensure all set is in focus var depth = focalPoint*5 / ((t.z + 5*scale) +1); if (depth<=0) return; var x1 = t.x*depth+centreX; var y1 = t.y*depth+centreY; transforms.push( {x:x1, y:y1, z:t.z} ); } for (var i=0; i<icosahedronTris.length;i+=3) { var a = icosahedronTris[i]; var b = icosahedronTris[i+1]; var c = icosahedronTris[i+2]; // back face cull var dx1 = transforms[b].x - transforms[a].x; var dy1 = transforms[b].y - transforms[a].y; var dx2 = transforms[b].x - transforms[c].x; var dy2 = transforms[b].y - transforms[c].y; var cross = (dx1*dy2 - dy1*dx2); if (cross < 0) continue; // use cross product normal to reflect light var shade = Math.floor(Math.sqrt(cross)*scale)+10; // fill the triangle context.beginPath(); context.moveTo(transforms[a].x, transforms[a].y); context.lineTo(transforms[b].x, transforms[b].y); context.lineTo(transforms[c].x, transforms[c].y); context.closePath(); context.fillStyle = 'rgba('+shade+','+shade+','+shade+',1)'; context.fill(); // edge it in red for fun context.lineWidth = 1; context.strokeStyle = 'rgba('+(shade>>1)+','+(shade>>1)+','+(shade>>1)+', 1)'; context.stroke(); }
}
// test multiple groups
var icosahedronVerts = [];
var icosahedronTris = [];
function buildVerts()
{ icosahedronVerts = [ {x: 0.000, y: 0.000, z: 1.000}, {x: 0.894, y: 0.000, z: 0.447}, {x: 0.276, y: 0.851, z: 0.447}, {x:-0.724, y: 0.526, z: 0.447}, {x:-0.724, y:-0.526, z: 0.447}, {x: 0.276, y:-0.851, z: 0.447}, {x: 0.724, y: 0.526, z:-0.447}, {x:-0.276, y: 0.851, z:-0.447}, {x:-0.894, y: 0.000, z:-0.447}, {x:-0.276, y:-0.851, z:-0.447}, {x: 0.724, y:-0.526, z:-0.447}, {x: 0.000, y: 0.000, z:-1.000} ]; icosahedronTris = [ 0,1,2, 0,2,3, 0,3,4, 0,4,5, 0,5,1, 11,7,6, 11,8,7, 11,9,8, 11,10,9, 11,6,10, 2,1,6, 2,7,3, 3,8,4, 4,9,5, 5,10,1, 6,7,2, 7,8,3, 8,9,4, 9,10,5, 10,6,1 ];
} // initialization
function init()
{ // setup canvas and context canvas = document.getElementById('asteroid field 3d'); context = canvas.getContext('2d'); // set canvas to be window dimensions resize(); // create event listeners canvas.addEventListener('mousemove', mouseMove); canvas.addEventListener('click', mouseClick); window.addEventListener('resize', resize); // initialze variables buildVerts(); // build asteroidds SetupAsteriods();
}
// input functions
function mouseMove(event)
{ var rect = canvas.getBoundingClientRect(); mouseX = event.clientX - rect.left, mouseY = event.clientY - rect.top
}
function mouseClick()
{ shieldUp^=1; splutterCount = 30; splutterNoise = 60;
}
function resize()
{ canvas.width = window.innerWidth; canvas.height = window.innerHeight; // compute centre of screen centreX = canvas.width/2; centreY = canvas.height/2;
}
// rendering functions
var phi = Math.PI*0.5;
var theta = 0;
function renderIcosahedron()
{ var scale = 512/canvas.height; phi+=0.009; theta+=0.01; var transforms = []; var cphi = Math.cos(phi); var sphi = Math.sin(phi); var ctheta = Math.cos(theta); var stheta = Math.sin(theta); // transform into 3d coords for (var i=0; i<icosahedronVerts.length; i++) { var vert = icosahedronVerts[i]; var tz = vert.z * ctheta + vert.y * stheta; var ty = vert.y * ctheta - vert.z * stheta; // rotate phi var tx = vert.x * cphi - ty * sphi; ty = ty * cphi + vert.x * sphi; // pixel depth using a long focal distance to ensure all set is in focus var depth = focalPoint*5 / ((tz + 5*scale) +1); var x1 = tx*depth+centreX; var y1 = ty*depth+centreY; transforms.push( {x:x1, y:y1, z:tz} ); } for (var i=0; i<icosahedronTris.length;i+=3) { var a = icosahedronTris[i]; var b = icosahedronTris[i+1]; var c = icosahedronTris[i+2]; // back face cull var dx1 = transforms[b].x - transforms[a].x; var dy1 = transforms[b].y - transforms[a].y; var dx2 = transforms[b].x - transforms[c].x; var dy2 = transforms[b].y - transforms[c].y; var cross = (dx1*dy2 - dy1*dx2); if (cross < 0) continue; // use cross product normal to reflect light var shade = Math.floor(Math.sqrt(cross)*scale)+10; // fill the triangle context.beginPath(); context.moveTo(transforms[a].x, transforms[a].y); context.lineTo(transforms[b].x, transforms[b].y); context.lineTo(transforms[c].x, transforms[c].y); context.closePath(); context.fillStyle = 'rgba('+shade+','+shade+','+shade+',1)'; context.fill(); // edge it in red for fun context.lineWidth = 2; context.strokeStyle = 'rgba('+(shade>>4)+','+(shade>>4)+','+(shade>>4)+', 1)'; context.stroke(); }
}
var spin =0;
function renderShield()
{ var phi = Math.PI*0.5; var theta = spin; var transforms = []; var cphi = Math.cos(phi); var sphi = Math.sin(phi); var ctheta = Math.cos(theta); var stheta = Math.sin(theta); // transform into 3d coords for (var i=0; i<icosahedronVerts.length; i++) { var vert = icosahedronVerts[i]; var tz = vert.z * ctheta + vert.y * stheta; var ty = vert.y * ctheta - vert.z * stheta; // rotate phi var tx = vert.x * cphi - ty * sphi; ty = ty * cphi + vert.x * sphi; // pixel depth using a long focal distance to ensure all set is in focus var depth = 1200 / ((tz + 0.2*256/canvas.height) +1); var x1 = tx*depth+centreX; var y1 = ty*depth+centreY; transforms.push( {x:x1, y:y1, z:tz} ); } for (var i=0; i<icosahedronTris.length;i+=3) { var a = icosahedronTris[i]; var b = icosahedronTris[i+1]; var c = icosahedronTris[i+2]; // back face cull var dx1 = transforms[b].x - transforms[a].x; var dy1 = transforms[b].y - transforms[a].y; var dx2 = transforms[b].x - transforms[c].x; var dy2 = transforms[b].y - transforms[c].y; var cross = (dx1*dy2 - dy1*dx2); if (cross > 0) continue; // use cross product normal to reflect light var shade = Math.floor(Math.sqrt(-cross)); // fill the triangle context.beginPath(); context.moveTo(transforms[a].x, transforms[a].y); context.lineTo(transforms[b].x, transforms[b].y); context.lineTo(transforms[c].x, transforms[c].y); context.closePath(); context.fillStyle = 'rgba('+0+','+shade+','+0+',0.25)'; context.fill(); // edge it in red for fun context.lineWidth = 1; context.strokeStyle = 'rgba('+0+','+shade+','+0+', 0.1)'; context.stroke(); }
}
function render()
{ context.fillStyle = 'black'; context.clearRect(0, 0, canvas.width, canvas.height); context.globalCompositeOperation='source-over'; RenderAsteriods(); context.globalCompositeOperation='lighter'; splutterNoise++; spin+=0.01; if (splutterCount) splutterCount--; var splutter = splutterNoise&splutterCount; if ( shieldUp & !splutter) renderShield(); context.globalCompositeOperation='source-over'; context.globalAlpha = 1.0; context.font = '20pt Calibri'; context.fillStyle = 'rgb(255,255,255)'; context.textAlign = "center"; context.fillText('Asteriod Field', canvas.width/2, 20); context.font = '14pt Calibri'; context.fillText('(mouse button to Shield Up)', canvas.width/2, 40); var d = new Date(); var currentTime = d.getTime(); context.font = '14pt Calibri'; context.fillText('respawn in ' + Math.floor((spawnTime - currentTime)/1000), canvas.width/2, canvas.height-10);
}
// movement functions
function update()
{ var d = new Date(); var currentTime = d.getTime(); if ( spawnTime - currentTime <0) SetupAsteriods(); UpdateAsteriods();
}
// per frame tick functions
function animate()
{ frameCount++; // movement update update(); // render update render(); // trigger next frame requestAnimationFrame(animate);
}
// entry point
init();
animate();
Asteriod Field - Script Codes
Asteriod Field - Script Codes
Home Page Home
Developer Andi Smithers
Username Bolloxim
Uploaded November 21, 2022
Rating 3
Size 5,554 Kb
Views 12,144
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