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☑️ adding bounding box calculation from current lat/lng + zoom
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commit
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@ -22,6 +22,7 @@
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"drawille-canvas-blessed-contrib": "^0.1.3",
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"keypress": "^0.2.1",
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"pbf": "^3.0.0",
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"sphericalmercator": "^1.0.5",
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"term-mouse": "^0.1.1",
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"vector-tile": "^1.3.0"
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}
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@ -4,11 +4,28 @@ Protobuf = require 'pbf'
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keypress = require 'keypress'
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fs = require 'fs'
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zlib = require 'zlib'
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TermMouse = require('term-mouse')
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TermMouse = require 'term-mouse'
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mercator = new (require('sphericalmercator'))()
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utils =
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deg2rad: (angle) ->
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# (angle / 180) * Math.PI
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angle * 0.017453292519943295
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rad2deg: (angle) ->
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angle / Math.PI * 180
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digits: (number, digits) ->
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Math.floor(number*Math.pow(10, digits))/Math.pow(10, digits)
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metersPerPixel: (zoom, lat = 0) ->
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utils.rad2deg(40075017*Math.cos(utils.deg2rad(lat))/Math.pow(2, zoom+8))
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console.log utils.metersPerPixel(16, 180)
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process.exit 0
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class Termap
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config:
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zoomStep: 1
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zoomStep: 0.5
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drawOrder: ["admin", "water", "landuse", "building", "road", "poi_label", "housenum_label"]
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icons:
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@ -38,12 +55,12 @@ class Termap
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minZoom: 10
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color: 8
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# poi_label:
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# minZoom: 3
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# color: "yellow"
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poi_label:
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minZoom: 3
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color: "yellow"
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road:
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color: "white"
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color: 15
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landuse:
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color: "green"
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@ -63,7 +80,13 @@ class Termap
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mousePosition: [0, 0]
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mouseDragging: false
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center:
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lat: 49.019855
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lng: 12.096956
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zoom: 0
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view: [-400, -80]
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scale: 4
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constructor: ->
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@ -173,13 +196,14 @@ class Termap
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@canvas.translate @view[0], @view[1]
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scale = Math.pow 2, @zoom
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for layer in @config.drawOrder
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continue unless @features?[layer]
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if @config.layers[layer].minZoom and @scale > @config.layers[layer].minZoom
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if @config.layers[layer].minZoom and @zoom > @config.layers[layer].minZoom
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continue
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@canvas.strokeStyle = @canvas.fillStyle = @config.layers[layer].color
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for feature in @features[layer]
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@ -187,7 +211,7 @@ class Termap
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visible = false
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points = for point in points
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p = [point.x/@scale, point.y/@scale]
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p = [point.x/scale, point.y/scale]
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if not visible and
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p[0]+@view[0]>=4 and
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p[0]+@view[0]<@width-4 and
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@ -218,8 +242,15 @@ class Termap
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_write: (text) ->
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process.stdout.write text
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_getBBox: ->
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[x, y] = mercator.forward [@center.lng, @center.lat]
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width = @width * Math.pow(2, @zoom)
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height = @height * Math.pow(2, @zoom)
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mercator.inverse([x - width/2, y + width/2]).concat mercator.inverse([x + width/2, y - width/2])
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_getFooter: ->
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"scale: #{Math.floor(@scale*1000)/1000}"
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"center: [lat: #{utils.digits @center.lat, 3} lng: #{utils.digits @center.lng, 3}] zoom: #{@zoom} bbox: [#{@_getBBox().map((z) -> utils.digits(z, 3)).join(',')}]"
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notify: (text) ->
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return if @isDrawing
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@ -230,6 +261,7 @@ class Termap
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before = @scale
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@scale += step
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@zoom += step
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@view[0] = @view[0]*before/@scale + if step > 0 then 8 else -8
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@view[1] = @view[1]*before/@scale + if step > 0 then 8 else -8
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