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support CMYK gradients

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alafr 2017-12-25 12:31:54 +01:00 committed by GitHub
parent ffa487fd50
commit 873df76b08
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1 changed files with 21 additions and 4 deletions
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25
lib/gradient.coffee
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@ -1,15 +1,32 @@
{number} = require './object'
class PDFGradient
constructor: (@doc) ->
@stops = []
@embedded = no
@transform = [1, 0, 0, 1, 0, 0]
@_colorSpace = 'DeviceRGB'
stop: (pos, color, opacity = 1) ->
color = @doc._normalizeColor(color)
if @stops.length is 0
if color.length is 3
@_colorSpace = 'DeviceRGB'
else if color.length is 4
@_colorSpace = 'DeviceCMYK'
else if color.length is 1
@_colorSpace = 'DeviceGray'
else
throw new Error('Unknown color space')
else if (@_colorSpace is 'DeviceRGB' and color.length isnt 3) or
(@_colorSpace is 'DeviceCMYK' and color.length isnt 4) or
(@_colorSpace is 'DeviceGray' and color.length isnt 1)
throw new Error('All gradient stops must use the same color space')
opacity = Math.max(0, Math.min(1, opacity))
@stops.push [pos, @doc._normalizeColor(color), opacity]
@stops.push [pos, color, opacity]
return this
setTransform: (m11, m12, m21, m22, dx, dy) ->
@transform = [m11, m12, m21, m22, dx, dy]
return this
@ -65,7 +82,7 @@ class PDFGradient
Type: 'Pattern'
PatternType: 2
Shading: shader
Matrix: (+v.toFixed(5) for v in @matrix)
Matrix: number(v) for v in @matrix
pattern.end()