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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,209 @@ | ||
| package gofpdf | ||
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| // | ||
| // GoFPDI | ||
| // | ||
| // Copyright 2015 Marcus Downing | ||
| // | ||
| // FPDI | ||
| // | ||
| // Copyright 2004-2014 Setasign - Jan Slabon | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
|
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| // CreateTemplate defines a new template using the current page size. | ||
| func (f *Fpdf) CreateTemplate(fn func(*Tpl)) Template { | ||
| return newTpl(PointType{0, 0}, f.curPageSize, f.unitStr, f.fontDirStr, fn, f) | ||
| } | ||
|
|
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| // CreateTemplateCustom starts a template, using the given bounds. | ||
| func (f *Fpdf) CreateTemplateCustom(corner PointType, size SizeType, fn func(*Tpl)) Template { | ||
| return newTpl(corner, size, f.unitStr, f.fontDirStr, fn, f) | ||
| } | ||
|
|
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| // CreateTemplate creates a template not attached to any document | ||
| func CreateTemplate(corner PointType, size SizeType, unitStr, fontDirStr string, fn func(*Tpl)) Template { | ||
| return newTpl(corner, size, unitStr, fontDirStr, fn, nil) | ||
| } | ||
|
|
||
| // UseTemplate adds a template to the current page or another template, | ||
| // using the size and position at which it was originally written. | ||
| func (f *Fpdf) UseTemplate(t Template) { | ||
| if t == nil { | ||
| f.SetErrorf("Template is nil") | ||
| return | ||
| } | ||
| corner, size := t.Size() | ||
| f.UseTemplateScaled(t, corner, size) | ||
| } | ||
|
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| // UseTemplateScaled adds a template to the current page or another template, | ||
| // using the given page coordinates. | ||
| func (f *Fpdf) UseTemplateScaled(t Template, corner PointType, size SizeType) { | ||
| if t == nil { | ||
| f.SetErrorf("Template is nil") | ||
| return | ||
| } | ||
|
|
||
| // You have to add at least a page first | ||
| if f.page <= 0 { | ||
| f.SetErrorf("Cannot use a template without first adding a page") | ||
| return | ||
| } | ||
|
|
||
| // make a note of the fact that we actually use this template, as well as any other templates, | ||
| // images or fonts it uses | ||
| f.templates[t.ID()] = t | ||
| for _, tt := range t.Templates() { | ||
| f.templates[tt.ID()] = tt | ||
| } | ||
| for name, ti := range t.Images() { | ||
| name = sprintf("t%d-%s", t.ID(), name) | ||
| f.images[name] = ti | ||
| } | ||
|
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||
| // template data | ||
| _, templateSize := t.Size() | ||
| scaleX := size.Wd / templateSize.Wd | ||
| scaleY := size.Ht / templateSize.Ht | ||
| tx := corner.X * f.k | ||
| ty := (f.curPageSize.Ht - corner.Y - size.Ht) * f.k | ||
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| f.outf("q %.4F 0 0 %.4F %.4F %.4F cm", scaleX, scaleY, tx, ty) // Translate | ||
| f.outf("/TPL%d Do Q", t.ID()) | ||
| } | ||
|
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| var nextTemplateIDChannel = func() chan int64 { | ||
| ch := make(chan int64) | ||
| go func() { | ||
| var nextID int64 = 1 | ||
| for { | ||
| ch <- nextID | ||
| nextID++ | ||
| } | ||
| }() | ||
| return ch | ||
| }() | ||
|
|
||
| // GenerateTemplateID gives the next template ID. These numbers are global so that they can never clash. | ||
| func GenerateTemplateID() int64 { | ||
| return <-nextTemplateIDChannel | ||
| } | ||
|
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| // Template is an object that can be written to, then used and re-used any number of times within a document. | ||
| type Template interface { | ||
| ID() int64 | ||
| Size() (PointType, SizeType) | ||
| Bytes() []byte | ||
| Images() map[string]*ImageInfoType | ||
| Templates() []Template | ||
| } | ||
|
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| // putTemplates writes the templates to the PDF | ||
| func (f *Fpdf) putTemplates() { | ||
| filter := "" | ||
| if f.compress { | ||
| filter = "/Filter /FlateDecode " | ||
| } | ||
|
|
||
| templates := sortTemplates(f.templates) | ||
| var t Template | ||
| for _, t = range templates { | ||
| corner, size := t.Size() | ||
|
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| f.newobj() | ||
| f.templateObjects[t.ID()] = f.n | ||
| f.outf("<<%s/Type /XObject", filter) | ||
| f.out("/Subtype /Form") | ||
| f.out("/Formtype 1") | ||
| f.outf("/BBox [%.2F %.2F %.2F %.2F]", corner.X*f.k, corner.Y*f.k, (corner.X+size.Wd)*f.k, (corner.Y+size.Ht)*f.k) | ||
| if corner.X != 0 || corner.Y != 0 { | ||
| f.outf("/Matrix [1 0 0 1 %.5F %.5F]", -corner.X*f.k*2, corner.Y*f.k*2) | ||
| } | ||
|
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| // Template's resource dictionary | ||
| f.out("/Resources ") | ||
| f.out("<</ProcSet [/PDF /Text /ImageB /ImageC /ImageI]") | ||
|
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| tImages := t.Images() | ||
| tTemplates := t.Templates() | ||
| if len(tImages) > 0 || len(tTemplates) > 0 { | ||
| f.out("/XObject <<") | ||
| for _, ti := range tImages { | ||
| f.outf("/I%d %d 0 R", ti.i, ti.n) | ||
| } | ||
| for _, tt := range tTemplates { | ||
| id := tt.ID() | ||
| if objID, ok := f.templateObjects[id]; ok { | ||
| f.outf("/TPL%d %d 0 R", id, objID) | ||
| } | ||
| } | ||
| f.out(">>") | ||
| } | ||
|
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| f.out(">>") | ||
|
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| // Write the template's byte stream | ||
| buffer := t.Bytes() | ||
| // fmt.Println("Put template bytes", string(buffer[:])) | ||
| if f.compress { | ||
| buffer = sliceCompress(buffer) | ||
| } | ||
| f.outf("/Length %d >>", len(buffer)) | ||
| f.putstream(buffer) | ||
| f.out("endobj") | ||
| } | ||
| } | ||
|
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| // sortTemplates puts templates in a suitable order based on dependices | ||
| func sortTemplates(templates map[int64]Template) []Template { | ||
| chain := make([]Template, 0, len(templates)*2) | ||
|
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| // build a full set of dependency chains | ||
| for _, t := range templates { | ||
| tlist := templateChainDependencies(t) | ||
| for _, tt := range tlist { | ||
| if tt != nil { | ||
| chain = append(chain, tt) | ||
| } | ||
| } | ||
| } | ||
|
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| // reduce that to make a simple list | ||
| sorted := make([]Template, 0, len(templates)) | ||
| chain: | ||
| for _, t := range chain { | ||
| for _, already := range sorted { | ||
| if t == already { | ||
| continue chain | ||
| } | ||
| } | ||
| sorted = append(sorted, t) | ||
| } | ||
|
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| return sorted | ||
| } | ||
|
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| // templateChainDependencies is a recursive function for determining the full chain of template dependencies | ||
| func templateChainDependencies(template Template) []Template { | ||
| requires := template.Templates() | ||
| chain := make([]Template, len(requires)*2) | ||
| for _, req := range requires { | ||
| for _, sub := range templateChainDependencies(req) { | ||
| chain = append(chain, sub) | ||
| } | ||
| } | ||
| chain = append(chain, template) | ||
| return chain | ||
| } |
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