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emptymap.js
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emptymap.js
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var Matrix = require('transformatrix')
var em = function(viewportSize,options) {
if(!viewportSize) throw new Error('viewport size not defined')
this.vpSize = viewportSize
this.opt = options || {}
this.projExt = this.opt.projExtent || {
left: -20037508.342789244,
right: 20037508.342789244,
bottom: -20037508.342789244,
top: 20037508.342789244
}
this.tSize = this.opt.tileSize || 256
this.maxRes = Math.min(
Math.abs(this.projExt.right - this.projExt.left)/this.tSize,
Math.abs(this.projExt.top - this.projExt.bottom)/this.tSize)
this.matrix = new Matrix()
this.matrixNonScalable = new Matrix()
if(this.opt.view && this.opt.callback)
this.setVeiw(this.opt.view,this.opt.callback,this.opt.scope)
}
em.prototype.setView = function(view, cb, scope) {
view.center = view.center || [0,0]
//TODO webscale to scale
view.webScale = view.hasOwnProperty('webScale') ? view.webScale
: view.hasOwnProperty('zoom') ? Math.pow(2,view.zoom)
: view.hasOwnProperty('resolution') ? this.maxRes/view.resolution : 1
view.rotation = view.rotation || 0
this._setAt(view.center, view.webScale, view.rotation)
if (cb) {
if (typeof(cb) !== 'function')
throw new TypeError('cb is not function')
scope = scope || this
cb.call(scope, null,{
matrix: this.matrix.m,
matrixNonScalable: this.matrixNonScalable.m,
map:this})
}
}
em.prototype.move = function(delta, cb, scope) {
var deltaX = delta.deltaX || 0,
deltaY = delta.deltaY || 0
var basePx = this.matrix.inverse().transformPoint(deltaX,deltaY)
var baseVPTopLeftPx = this.matrix.inverse().transformPoint(0,0)
this.matrix.translate(
basePx[0] - baseVPTopLeftPx[0], basePx[1] - baseVPTopLeftPx[1])
// apply for tile matrix
basePx = this.matrixNonScalable.inverse().transformPoint(deltaX,deltaY)
baseVPTopLeftPx = this.matrixNonScalable.inverse().transformPoint(0,0)
this.matrixNonScalable.translate(
basePx[0] - baseVPTopLeftPx[0], basePx[1] - baseVPTopLeftPx[1])
if (cb) {
if (typeof(cb) !== 'function')
throw new TypeError('callback is not function')
scope = scope || this
cb.call(scope, null,{
matrix: this.matrix.m,
matrixNonScalable: this.matrixNonScalable.m,
map:this})
}
}
em.prototype.scaleRotate = function(params, cb, scope) {
var vpPx = params.center || [this.vpSize.width/2, this.vpSize.height/2],
factor = params.factor || 1,
rot = params.rotation || params.rotate || 0,
basePx, destBasePx
basePx = this.matrix.inverse().transformPoint(vpPx[0],vpPx[1]),
this.matrix.translate(basePx[0],basePx[1])
.rotate(Math.PI*rot/180)
.scale(factor,factor)
.translate(-basePx[0],-basePx[1])
// for tile matrix
basePx = this.matrixNonScalable.inverse().transformPoint(vpPx[0],vpPx[1])
this.matrixNonScalable.translate(basePx[0],basePx[1])
.rotate(Math.PI*rot/180)
.translate(-basePx[0],-basePx[1])
if (cb) {
if (typeof(cb) !== 'function')
throw new TypeError('callback is not function')
scope = scope || this
cb.call(scope, null,{
matrix: this.matrix.m,
matrixNonScalable: this.matrixNonScalable.m,
map:this})
}
}
em.prototype.resetMatrixNonScalable = function(cb,scope) {
var rot = Math.atan2(this.matrixNonScalable.m[1],this.matrixNonScalable.m[0])
this.matrixNonScalable.reset()
this.matrixNonScalable.translate(this.vpSize.width/2,this.vpSize.height/2)
.rotate(rot)
.translate(-this.vpSize.width/2,-this.vpSize.height/2)
if (cb) {
if (typeof(cb) !== 'function')
throw new TypeError('callback is not function')
scope = scope || this
cb.call(scope, null,{
matrix: this.matrix.m,
matrixNonScalable: this.matrixNonScalable.m,
map:this})
}
}
em.prototype.getCenter = function() {
var ctrBasePx = this.matrix.inverse()
.transformPoint(this.vpSize.width/2,this.vpSize.height/2)
return [
this.projExt.left + ctrBasePx[0]*this.maxRes,
this.projExt.top - ctrBasePx[1] * this.maxRes ]
}
em.prototype.getZoom = function() {
return Math.log(this._getWebScale()) / Math.log(2)
}
em.prototype.getNearestZoom = function() {
return Math.round(this.getZoom())
}
em.prototype._getWebScale = function() {
var m = this.matrix.m
return Math.sqrt(m[0] * m[0] + m[1] * m[1])
}
em.prototype.getResolution = function() {
return this.maxRes/this._getWebScale()
}
em.prototype.getRotation = function() {
var m = this.matrix.m
return Math.atan2(m[1],m[0]) * 180/Math.PI
}
em.prototype.getView = function() {
return {
center: this.getCenter(),
zoom: this.getZoom(),
resolution: this.maxRes/this._getWebScale(),
rotation: this.getRotation()
}
}
em.prototype.getExtent = function() {
var inv = this.matrix.inverse()
return {
ll: this._basePxToLongLat(inv.transformPoint(0,this.vpSize.height)),
lr: this._basePxToLongLat(inv.transformPoint(
this.vpSize.width,
this.vpSize.height)),
ur: this._basePxToLongLat(inv.transformPoint(this.vpSize.width, 0)),
ul: this._basePxToLongLat(inv.transformPoint(0,0))}
}
em.prototype.toLongLat = function(px) {
var basePx = this.matrix.inverse().transformPoint(px[0],px[1])
return this._basePxToLongLat(basePx)
}
em.prototype.toViewportPx = function(longLat) {
var basePx = this._longLatToBasePx(longLat)
return this.matrix.transformPoint(basePx[0],basePx[1])
}
em.prototype.getViewportBBox = function() {
var extent, xArray, yArray, left, right, top, bottom
extent = this.getExtent()
xArray = Object.keys(extent).map(function(key) {return extent[key][0]});
yArray = Object.keys(extent).map(function(key) {return extent[key][1]});
left = Math.min.apply(this,xArray)
right = Math.max.apply(this,xArray)
bottom = Math.min.apply(this,yArray)
top = Math.max.apply(this,yArray)
return {left: left, right: right, bottom: bottom, top: top}
}
em.prototype._setAt = function(ctr, webScale, rot) {
var baseCtr = this._longLatToBasePx(ctr)
this.matrix.reset()
this.matrix.translate(baseCtr[0],baseCtr[1])
.rotate(Math.PI/180*rot)
.scale(webScale,webScale)
.translate(-baseCtr[0],-baseCtr[1])
var baseVPCenter = this.matrix.inverse()
.transformPoint(this.vpSize.width/2,this.vpSize.height/2)
this.matrix.translate(baseVPCenter[0] - baseCtr[0], baseVPCenter[1] - baseCtr[1])
// for tile matrix
this.matrixNonScalable.reset()
this.matrixNonScalable.translate(this.vpSize.width/2,this.vpSize.height/2)
.rotate(rot * Math.PI/180)
.translate(-this.vpSize.width/2,-this.vpSize.height/2)
}
em.prototype._longLatToBasePx = function(longLat) {
return [
(longLat[0] - this.projExt.left)/this.maxRes,
(this.projExt.top - longLat[1])/this.maxRes]
}
em.prototype._basePxToLongLat = function(px) {
return [
this.projExt.left + px[0]*this.maxRes,
this.projExt.top - px[1]*this.maxRes]
}
module.exports = em