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Simple Sprite & TextSprite classes for THREE.js
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| THREE = require 'three' | |
| module.exports = class Sprite extends THREE.Mesh | |
| constructor: (texture, @frameWidth, @frameHeight, @yOffset = 0) -> | |
| @frameWidth ?= texture.image.width | |
| @frameHeight ?= texture.image.height | |
| geometry = new THREE.PlaneGeometry @frameWidth, @frameHeight | |
| material = new THREE.MeshBasicMaterial map: texture, alphaTest: 0.1, side: THREE.DoubleSide | |
| THREE.Mesh.call @, geometry, material | |
| @setFrame 0 | |
| setFrame: (frame) -> | |
| uvs = @geometry.faceVertexUvs[0] | |
| frameX = frame % (@material.map.image.width / @frameWidth) | |
| frameY = Math.floor(frame / (@material.map.image.width / @frameWidth)) | |
| left = ( frameX * @frameWidth) / @material.map.image.width | |
| right = ((frameX+1) * @frameWidth) / @material.map.image.width | |
| top = ( @material.map.image.height - @yOffset - frameY * @frameHeight) / @material.map.image.height | |
| bottom = ( @material.map.image.height - @yOffset - (frameY+1) * @frameHeight) / @material.map.image.height | |
| # bottom left | |
| uvs[0][0].set left, bottom | |
| # top right | |
| uvs[1][1].set right, top | |
| # top left | |
| uvs[0][1].set left, top | |
| uvs[1][0].set left, top | |
| # bottom right | |
| uvs[0][2].set right, bottom | |
| uvs[1][2].set right, bottom | |
| @geometry.uvsNeedUpdate = true | |
| return |
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| Sprite = require './Sprite' | |
| THREE = require 'three' | |
| module.exports = class TextSprite extends Sprite | |
| constructor: (text, options) -> | |
| text ?= '' | |
| options ?= {} | |
| options.width ?= 200 | |
| options.height ?= 30 | |
| options.textAlign ?= 'center' | |
| canvas = document.createElement 'canvas' | |
| canvas.width = options.width | |
| canvas.height = options.height | |
| @ctx = canvas.getContext '2d' | |
| @ctx.fillStyle = 'rgba(100, 100, 100, 0.8)' | |
| @ctx.textAlign = options.textAlign | |
| @ctx.textBaseline = 'middle' | |
| @ctx.font = "#{options.fontWeight ? ''} #{options.fontSize ? 20}px Arial" | |
| @texture = new THREE.Texture canvas | |
| @setText text | |
| super @texture | |
| @material.transparent = true | |
| setText: (text) -> | |
| @ctx.clearRect 0, 0, @ctx.canvas.width, @ctx.canvas.height | |
| text ?= '' | |
| switch @ctx.textAlign | |
| when 'left' then @ctx.fillText text, 0, @ctx.canvas.height / 2 | |
| when 'center' then @ctx.fillText text, @ctx.canvas.width / 2, @ctx.canvas.height / 2 | |
| when 'right' then @ctx.fillText text, @ctx.canvas.width, @ctx.canvas.height / 2 | |
| @texture.needsUpdate = true | |
| return |
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