1// Copyright (c) Kurt Jung (Gmail: kurt.w.jung) 2// 3// Permission to use, copy, modify, and distribute this software for any 4// purpose with or without fee is hereby granted, provided that the above 5// copyright notice and this permission notice appear in all copies. 6// 7// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 10// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 12// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 13// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 14 15// Adapted from http://www.fpdf.org/en/script/script89.php by Olivier PLATHEY 16 17package gofpdf 18 19import ( 20 "fmt" 21 "strings" 22) 23 24func byteBound(v byte) byte { 25 if v > 100 { 26 return 100 27 } 28 return v 29} 30 31// AddSpotColor adds an ink-based CMYK color to the gofpdf instance and 32// associates it with the specified name. The individual components specify 33// percentages ranging from 0 to 100. Values above this are quietly capped to 34// 100. An error occurs if the specified name is already associated with a 35// color. 36func (f *Fpdf) AddSpotColor(nameStr string, c, m, y, k byte) { 37 if f.err == nil { 38 _, ok := f.spotColorMap[nameStr] 39 if !ok { 40 id := len(f.spotColorMap) + 1 41 f.spotColorMap[nameStr] = spotColorType{ 42 id: id, 43 val: cmykColorType{ 44 c: byteBound(c), 45 m: byteBound(m), 46 y: byteBound(y), 47 k: byteBound(k), 48 }, 49 } 50 } else { 51 f.err = fmt.Errorf("name \"%s\" is already associated with a spot color", nameStr) 52 } 53 } 54} 55 56func (f *Fpdf) getSpotColor(nameStr string) (clr spotColorType, ok bool) { 57 if f.err == nil { 58 clr, ok = f.spotColorMap[nameStr] 59 if !ok { 60 f.err = fmt.Errorf("spot color name \"%s\" is not registered", nameStr) 61 } 62 } 63 return 64} 65 66// SetDrawSpotColor sets the current draw color to the spot color associated 67// with nameStr. An error occurs if the name is not associated with a color. 68// The value for tint ranges from 0 (no intensity) to 100 (full intensity). It 69// is quietly bounded to this range. 70func (f *Fpdf) SetDrawSpotColor(nameStr string, tint byte) { 71 var clr spotColorType 72 var ok bool 73 74 clr, ok = f.getSpotColor(nameStr) 75 if ok { 76 f.color.draw.mode = colorModeSpot 77 f.color.draw.spotStr = nameStr 78 f.color.draw.str = sprintf("/CS%d CS %.3f SCN", clr.id, float64(byteBound(tint))/100) 79 if f.page > 0 { 80 f.out(f.color.draw.str) 81 } 82 } 83} 84 85// SetFillSpotColor sets the current fill color to the spot color associated 86// with nameStr. An error occurs if the name is not associated with a color. 87// The value for tint ranges from 0 (no intensity) to 100 (full intensity). It 88// is quietly bounded to this range. 89func (f *Fpdf) SetFillSpotColor(nameStr string, tint byte) { 90 var clr spotColorType 91 var ok bool 92 93 clr, ok = f.getSpotColor(nameStr) 94 if ok { 95 f.color.fill.mode = colorModeSpot 96 f.color.fill.spotStr = nameStr 97 f.color.fill.str = sprintf("/CS%d cs %.3f scn", clr.id, float64(byteBound(tint))/100) 98 f.colorFlag = f.color.fill.str != f.color.text.str 99 if f.page > 0 { 100 f.out(f.color.fill.str) 101 } 102 } 103} 104 105// SetTextSpotColor sets the current text color to the spot color associated 106// with nameStr. An error occurs if the name is not associated with a color. 107// The value for tint ranges from 0 (no intensity) to 100 (full intensity). It 108// is quietly bounded to this range. 109func (f *Fpdf) SetTextSpotColor(nameStr string, tint byte) { 110 var clr spotColorType 111 var ok bool 112 113 clr, ok = f.getSpotColor(nameStr) 114 if ok { 115 f.color.text.mode = colorModeSpot 116 f.color.text.spotStr = nameStr 117 f.color.text.str = sprintf("/CS%d cs %.3f scn", clr.id, float64(byteBound(tint))/100) 118 f.colorFlag = f.color.text.str != f.color.text.str 119 } 120} 121 122func (f *Fpdf) returnSpotColor(clr colorType) (name string, c, m, y, k byte) { 123 var spotClr spotColorType 124 var ok bool 125 126 name = clr.spotStr 127 if name != "" { 128 spotClr, ok = f.getSpotColor(name) 129 if ok { 130 c = spotClr.val.c 131 m = spotClr.val.m 132 y = spotClr.val.y 133 k = spotClr.val.k 134 } 135 } 136 return 137} 138 139// GetDrawSpotColor returns the most recently used spot color information for 140// drawing. This will not be the current drawing color if some other color type 141// such as RGB is active. If no spot color has been set for drawing, zero 142// values are returned. 143func (f *Fpdf) GetDrawSpotColor() (name string, c, m, y, k byte) { 144 return f.returnSpotColor(f.color.draw) 145} 146 147// GetTextSpotColor returns the most recently used spot color information for 148// text output. This will not be the current text color if some other color 149// type such as RGB is active. If no spot color has been set for text, zero 150// values are returned. 151func (f *Fpdf) GetTextSpotColor() (name string, c, m, y, k byte) { 152 return f.returnSpotColor(f.color.text) 153} 154 155// GetFillSpotColor returns the most recently used spot color information for 156// fill output. This will not be the current fill color if some other color 157// type such as RGB is active. If no fill spot color has been set, zero values 158// are returned. 159func (f *Fpdf) GetFillSpotColor() (name string, c, m, y, k byte) { 160 return f.returnSpotColor(f.color.fill) 161} 162 163func (f *Fpdf) putSpotColors() { 164 for k, v := range f.spotColorMap { 165 f.newobj() 166 f.outf("[/Separation /%s", strings.Replace(k, " ", "#20", -1)) 167 f.out("/DeviceCMYK <<") 168 f.out("/Range [0 1 0 1 0 1 0 1] /C0 [0 0 0 0] ") 169 f.outf("/C1 [%.3f %.3f %.3f %.3f] ", float64(v.val.c)/100, float64(v.val.m)/100, 170 float64(v.val.y)/100, float64(v.val.k)/100) 171 f.out("/FunctionType 2 /Domain [0 1] /N 1>>]") 172 f.out("endobj") 173 v.objID = f.n 174 f.spotColorMap[k] = v 175 } 176} 177 178func (f *Fpdf) spotColorPutResourceDict() { 179 f.out("/ColorSpace <<") 180 for _, clr := range f.spotColorMap { 181 f.outf("/CS%d %d 0 R", clr.id, clr.objID) 182 } 183 f.out(">>") 184} 185