1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184
|
// Copyright (c) Kurt Jung (Gmail: kurt.w.jung)
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
// Adapted from http://www.fpdf.org/en/script/script89.php by Olivier PLATHEY
package gofpdf
import (
"fmt"
"strings"
)
func byteBound(v byte) byte {
if v > 100 {
return 100
}
return v
}
// AddSpotColor adds an ink-based CMYK color to the gofpdf instance and
// associates it with the specified name. The individual components specify
// percentages ranging from 0 to 100. Values above this are quietly capped to
// 100. An error occurs if the specified name is already associated with a
// color.
func (f *Fpdf) AddSpotColor(nameStr string, c, m, y, k byte) {
if f.err == nil {
_, ok := f.spotColorMap[nameStr]
if !ok {
id := len(f.spotColorMap) + 1
f.spotColorMap[nameStr] = spotColorType{
id: id,
val: cmykColorType{
c: byteBound(c),
m: byteBound(m),
y: byteBound(y),
k: byteBound(k),
},
}
} else {
f.err = fmt.Errorf("name \"%s\" is already associated with a spot color", nameStr)
}
}
}
func (f *Fpdf) getSpotColor(nameStr string) (clr spotColorType, ok bool) {
if f.err == nil {
clr, ok = f.spotColorMap[nameStr]
if !ok {
f.err = fmt.Errorf("spot color name \"%s\" is not registered", nameStr)
}
}
return
}
// SetDrawSpotColor sets the current draw color to the spot color associated
// with nameStr. An error occurs if the name is not associated with a color.
// The value for tint ranges from 0 (no intensity) to 100 (full intensity). It
// is quietly bounded to this range.
func (f *Fpdf) SetDrawSpotColor(nameStr string, tint byte) {
var clr spotColorType
var ok bool
clr, ok = f.getSpotColor(nameStr)
if ok {
f.color.draw.mode = colorModeSpot
f.color.draw.spotStr = nameStr
f.color.draw.str = sprintf("/CS%d CS %.3f SCN", clr.id, float64(byteBound(tint))/100)
if f.page > 0 {
f.out(f.color.draw.str)
}
}
}
// SetFillSpotColor sets the current fill color to the spot color associated
// with nameStr. An error occurs if the name is not associated with a color.
// The value for tint ranges from 0 (no intensity) to 100 (full intensity). It
// is quietly bounded to this range.
func (f *Fpdf) SetFillSpotColor(nameStr string, tint byte) {
var clr spotColorType
var ok bool
clr, ok = f.getSpotColor(nameStr)
if ok {
f.color.fill.mode = colorModeSpot
f.color.fill.spotStr = nameStr
f.color.fill.str = sprintf("/CS%d cs %.3f scn", clr.id, float64(byteBound(tint))/100)
f.colorFlag = f.color.fill.str != f.color.text.str
if f.page > 0 {
f.out(f.color.fill.str)
}
}
}
// SetTextSpotColor sets the current text color to the spot color associated
// with nameStr. An error occurs if the name is not associated with a color.
// The value for tint ranges from 0 (no intensity) to 100 (full intensity). It
// is quietly bounded to this range.
func (f *Fpdf) SetTextSpotColor(nameStr string, tint byte) {
var clr spotColorType
var ok bool
clr, ok = f.getSpotColor(nameStr)
if ok {
f.color.text.mode = colorModeSpot
f.color.text.spotStr = nameStr
f.color.text.str = sprintf("/CS%d cs %.3f scn", clr.id, float64(byteBound(tint))/100)
f.colorFlag = f.color.text.str != f.color.text.str
}
}
func (f *Fpdf) returnSpotColor(clr colorType) (name string, c, m, y, k byte) {
var spotClr spotColorType
var ok bool
name = clr.spotStr
if name != "" {
spotClr, ok = f.getSpotColor(name)
if ok {
c = spotClr.val.c
m = spotClr.val.m
y = spotClr.val.y
k = spotClr.val.k
}
}
return
}
// GetDrawSpotColor returns the most recently used spot color information for
// drawing. This will not be the current drawing color if some other color type
// such as RGB is active. If no spot color has been set for drawing, zero
// values are returned.
func (f *Fpdf) GetDrawSpotColor() (name string, c, m, y, k byte) {
return f.returnSpotColor(f.color.draw)
}
// GetTextSpotColor returns the most recently used spot color information for
// text output. This will not be the current text color if some other color
// type such as RGB is active. If no spot color has been set for text, zero
// values are returned.
func (f *Fpdf) GetTextSpotColor() (name string, c, m, y, k byte) {
return f.returnSpotColor(f.color.text)
}
// GetFillSpotColor returns the most recently used spot color information for
// fill output. This will not be the current fill color if some other color
// type such as RGB is active. If no fill spot color has been set, zero values
// are returned.
func (f *Fpdf) GetFillSpotColor() (name string, c, m, y, k byte) {
return f.returnSpotColor(f.color.fill)
}
func (f *Fpdf) putSpotColors() {
for k, v := range f.spotColorMap {
f.newobj()
f.outf("[/Separation /%s", strings.Replace(k, " ", "#20", -1))
f.out("/DeviceCMYK <<")
f.out("/Range [0 1 0 1 0 1 0 1] /C0 [0 0 0 0] ")
f.outf("/C1 [%.3f %.3f %.3f %.3f] ", float64(v.val.c)/100, float64(v.val.m)/100,
float64(v.val.y)/100, float64(v.val.k)/100)
f.out("/FunctionType 2 /Domain [0 1] /N 1>>]")
f.out("endobj")
v.objID = f.n
f.spotColorMap[k] = v
}
}
func (f *Fpdf) spotColorPutResourceDict() {
f.out("/ColorSpace <<")
for _, clr := range f.spotColorMap {
f.outf("/CS%d %d 0 R", clr.id, clr.objID)
}
f.out(">>")
}
|