kopia lustrzana https://github.com/rastapasta/mapscii
106 wiersze
2.8 KiB
CoffeeScript
106 wiersze
2.8 KiB
CoffeeScript
###
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termap - Terminal Map Viewer
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by Michael Strassburger <codepoet@cpan.org>
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Simple pixel to barille character mapper
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Implementation inspired by node-drawille (https://github.com/madbence/node-drawille)
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* added color support
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* added support for filled polygons
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* added text label support
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* general optimizations
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-> more bit shifting/operations, less Math.floors
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Will either be merged into node-drawille or become an own module at some point
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###
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module.exports = class BrailleBuffer
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characterMap: [[0x1, 0x8],[0x2, 0x10],[0x4, 0x20],[0x40, 0x80]]
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pixelBuffer: null
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charBuffer: null
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foregroundBuffer: null
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backgroundBuffer: null
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globalBackground: null
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termReset: "\x1B[39;49m"
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constructor: (@width, @height) ->
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size = @width*@height/8
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@pixelBuffer = new Buffer size
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@foregroundBuffer = new Buffer size
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@backgroundBuffer = new Buffer size
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@clear()
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clear: ->
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@pixelBuffer.fill 0
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@charBuffer = []
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@foregroundBuffer.fill 0
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@backgroundBuffer.fill 0
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setGlobalBackground: (@globalBackground) ->
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setBackground: (x, y, color) ->
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return unless 0 <= x < @width and 0 <= y < @height
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idx = @_project x, y
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@backgroundBuffer[idx] = color
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setPixel: (x, y, color) ->
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@_locate x, y, (idx, mask) =>
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@pixelBuffer[idx] |= mask
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@foregroundBuffer[idx] = color
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unsetPixel: (x, y) ->
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@_locate x, y, (idx, mask) =>
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@pixelBuffer[idx] &= ~mask
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_project: (x, y) ->
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(x>>1) + (@width>>1)*(y>>2)
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_locate: (x, y, cb) ->
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return unless 0 <= x < @width and 0 <= y < @height
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idx = @_project x, y
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mask = @characterMap[y&3][x&1]
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cb idx, mask
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_termColor: (foreground, background) ->
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background = background or @globalBackground
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if foreground and background
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"\x1B[38;5;#{foreground};48;5;#{background}m"
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else if foreground
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"\x1B[49;38;5;#{foreground}m"
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else if background
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"\x1B[39;48;5;#{background}m"
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else
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@termReset
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frame: ->
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output = []
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currentColor = null
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delimeter = "\n"
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for idx in [0...@pixelBuffer.length]
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output.push delimeter if idx and (idx % (@width/2)) is 0
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if currentColor isnt colorCode = @_termColor @foregroundBuffer[idx], @backgroundBuffer[idx]
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output.push currentColor = colorCode
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output.push if @charBuffer[idx]
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@charBuffer[idx]
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else
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String.fromCharCode 0x2800+@pixelBuffer[idx]
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output.push @termReset+delimeter
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output.join ''
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setChar: (char, x, y, color) ->
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return unless 0 <= x < @width and 0 <= y < @height
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idx = @_project x, y
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@charBuffer[idx] = char
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@foregroundBuffer[idx] = color
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writeText: (text, x, y, color, center = true) ->
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x -= text.length/2+1 if center
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@setChar text.charAt(i), x+i*2, y, color for i in [0...text.length]
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