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2d_1d.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js canvas - lines - colors</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
background-color: #000000;
margin: 0px;
overflow: hidden;
}
a {
color:#0078ff;
}
#info {
position: absolute;
top: 10px; width: 100%;
color: #ffffff;
padding: 5px;
font-family: Monospace;
font-size: 13px;
text-align: center;
z-index:100;
}
a {
color: orange;
text-decoration: none;
}
a:hover {
color: #0080ff;
}
</style>
</head>
<body>
<script src="libs/three.js"></script>
<script src="libs/Detector.js"></script>
<script src="libs/hilbert2D.js"></script>
<script src="libs/OrbitControls.js"></script>
<script>
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var camera, scene, renderer;
var points
var cubeMap ={}
var cubeLen
var pic_line_units = 64
var pic_width = 640
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 33, window.innerWidth / window.innerHeight, 1, 50000 );
camera.position.x = 0;
camera.position.z = 0;
camera.position.y = 1500;
scene = new THREE.Scene();
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
// lights
var ambientLight = new THREE.AmbientLight( 0x606060 );
scene.add( ambientLight );
var directionalLight = new THREE.DirectionalLight( 0xffffff );
directionalLight.position.set( 1, 0.75, 0.5 ).normalize();
scene.add( directionalLight );
//controls
var controls = new THREE.OrbitControls( camera, renderer.domElement);
controls.minDistance = 2;
controls.maxDistance = 50000;
controls.maxPolarAngle = Math.PI;
// 2d lines
var geometry2 = new THREE.Geometry()
points = hilbert2D( new THREE.Vector3( 0, 0, 0 ), pic_width/2, 5 )
var colors2 = []
for ( var i = 0; i < points.length; i ++ ) {
geometry2.vertices.push( points[ i ] );
colors2[ i ] = new THREE.Color( 0xffffff );
colors2[ i ].setHSL( i / points.length, 1, 0.5 );
}
geometry2.colors = colors2;
// lines
var material = new THREE.LineBasicMaterial( { color: 0xffffff, linewidth: 3, vertexColors: THREE.VertexColors } );
var line2d = new THREE.Line( geometry2, material );
line2d.position.set( 0, -2, 0 );
scene.add( line2d );
//fit img into cubes
fitImgs()
//
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function onDocumentMouseMove( event ) {
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
function onDocumentTouchStart( event ) {
if ( event.touches.length > 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
//
function animate() {
requestAnimationFrame( animate );
render();
for (var i=0;i<points.length-1;i++){
var point = points[i]
var voxel = cubeMap[point.x+":"+point.z]
if(! voxel){
return
}
var nextPoint = points[i+1]
var nextVoxel = cubeMap[nextPoint.x+":"+nextPoint.z]
voxel.position.x = nextVoxel.position.x
voxel.position.z = nextVoxel.position.z
}
var lastIndex = points.length-1
var lastPoint = points[lastIndex]
var lastVoxel = cubeMap[lastPoint.x+":"+lastPoint.z]
lastVoxel.position.x = lastVoxel.position.x+cubeLen
}
function render() {
renderer.render( scene, camera );
}
function fitImgs(){
var canvas = document.createElement('canvas');
content = canvas.getContext('2d');
canvas.width = Math.sqrt(points.length)
canvas.height = canvas.width;
var img = new Image();
img.crossOrigin = '*';
img.src = "/imgs/mnls.jpeg";
img.onload = function() {
content.drawImage(img, 0, 0, canvas.width, canvas.height);
imgData = content.getImageData(0, 0, canvas.width, canvas.height);
//cubes
cubeLen = pic_width/canvas.width
for(var i=0;i<canvas.width;i++){//i=row
for(var j=0;j<canvas.height;j++){//j=col
let selectPos = i*canvas.width+j
var color = (imgData.data[4*selectPos]<<(4*4))+
(imgData.data[4*selectPos + 1]<<(2*4))+
imgData.data[4*selectPos + 2]
var cubeGeo = new THREE.BoxBufferGeometry( cubeLen, 0.1, cubeLen );
var material= new THREE.MeshPhongMaterial({
color:color,//三角面颜色
side:THREE.DoubleSide//两面可见
});
var voxel = new THREE.Mesh( cubeGeo, material );
var posX = (-canvas.width/2+j)*cubeLen+cubeLen/2
var posY = (-canvas.width/2+i)*cubeLen+cubeLen/2
voxel.position.set(posX,0,posY)
scene.add( voxel );
cubeMap[posX+":"+posY] = voxel
}
}
};
}
</script>
</body>
</html>