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// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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import (
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"bytes"
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"encoding/xml"
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"fmt"
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"image/color"
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"strconv"
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)
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// AddCompositeObject 按页面坐标向内部范围末尾添加基本对象，复用已注册资源
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// 入参: page 页面索引, path 父路径, object 文字、图片或路径
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// 返回: int 新成员序号, error 错误信息
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func (e *Editor) AddCompositeObject(page int, path ObjectPath, object GraphicObject) (int, error) {
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indexes, err := e.CopyObjectsToComposite(page, path, []GraphicObject{object}, 0, 0)
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if err != nil {
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return 0, err
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}
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return indexes[0], nil
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}
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// CopyObjectsToComposite 将页面坐标快照复制到内部范围，隔离目标继承样式并分配新标识
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// 保真快照保留原文，全部对象成功后提交一次撤销记录
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// 入参: page 页面索引, path 父路径, objects 当前文档快照或基本对象, dx、dy 页面位移
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// 返回: []int 新成员序号, error 错误信息
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func (e *Editor) CopyObjectsToComposite(page int, path ObjectPath, objects []GraphicObject, dx, dy float64) ([]int, error) {
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if !finite(dx) || !finite(dy) {
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return nil, fmt.Errorf("copy requires finite offsets")
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}
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var result []int
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err := e.editCompositeScope(page, path, func(renderer *Renderer, root *editorCompositeNode, members []*editorCompositeNode) error {
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if len(objects) == 0 {
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return nil
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}
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owner := root.loadedScope(path.Children)
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box, _ := ParseBox(owner.object.CompositeGraphicUnit.Boundary)
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parent := owner.parent.Multiply(TranslationMatrix(box.X, box.Y)).Multiply(NewMatrix(owner.object.CompositeGraphicUnit.CTM))
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inverse, ok := parent.Invert()
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if !ok {
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return fmt.Errorf("composite insertion requires an invertible transform")
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}
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next := len(members)
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if container := owner.node.child("Content"); container != nil {
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next = 0
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for _, member := range members {
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if member.owner != owner || member.span.start < container.close {
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next++
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}
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}
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}
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var content []byte
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for _, source := range objects {
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if source.Type == "CompositeObject" || source.Type == "CompositeGraphicUnit" {
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return fmt.Errorf("composite groups require their original editing scope")
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}
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id := e.nextID()
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object, err := e.prepareCopiedObject(id, source)
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if err != nil {
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return err
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}
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maximum := e.maxID
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object, origin, err := e.copyObjectOrigin(source, object, &maximum)
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if err != nil {
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return err
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}
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e.maxID = maximum
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var data []byte
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if origin != nil {
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data, err = editorXMLObject(origin.data, origin.node, origin.object, object)
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if err == nil {
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data, err = editorXMLStandalone(data, origin.node)
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}
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} else {
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data, err = editorObjectXML(object)
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}
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if err != nil {
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return err
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}
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node, err := newEditorCompositeNode(data)
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if err != nil {
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return err
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}
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node.parent, node.boundaryInCTM = IdentityMatrix, true
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if err := e.isolateCompositeStyle(node); err != nil {
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return err
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}
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if err := e.transformCompositeMember(renderer, node, inverse.Multiply(TranslationMatrix(dx, dy))); err != nil {
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return err
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}
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if !owner.boundaryInCTM {
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if err := node.update(compositeBoundary(node.object, parent, false)); err != nil {
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return err
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}
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}
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if origin == nil && object.TextObject.layout != nil {
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y, _ := strconv.ParseFloat(object.TextObject.TextCode[0].Y, 64)
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node.setState(editorCompositeState{layout: object.TextObject.layout, origin: [2]float64{0, y}})
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}
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for id, state := range node.states {
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owner.states[id] = state
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}
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content = append(content, node.data...)
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result = append(result, next+len(result))
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}
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if container := owner.node.child("Content"); container != nil {
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if container.open == container.end {
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owner.patches = append(owner.patches, editorXMLContent(owner.data, container, content))
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} else {
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owner.patches = append(owner.patches, editorXMLPatch{container.close, container.close, content})
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}
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} else {
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content, err := editorXMLContainer("Content", nil, content)
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if err != nil {
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return err
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}
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content = bytes.TrimPrefix(content, []byte(xml.Header))
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if owner.node.open == owner.node.end {
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owner.patches = append(owner.patches, editorXMLContent(owner.data, owner.node, content))
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} else {
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owner.patches = append(owner.patches, editorXMLPatch{owner.node.close, owner.node.close, content})
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}
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return result, nil
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}
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// isolateCompositeStyle 固定基本对象的绘制参数，避免目标容器改变颜色、虚线和线帽
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// 入参: node 页面坐标中的对象节点
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// 返回: error 错误信息
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func (e *Editor) isolateCompositeStyle(node *editorCompositeNode) error {
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object, err := e.resolveEditorStyleDefaults(node.object, &DrawParam{})
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if err != nil {
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return err
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}
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if object.Type == "TextObject" || object.Type == "PathObject" {
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id, err := e.neutralDrawParam()
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if err != nil {
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return err
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}
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if object.Type == "TextObject" {
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object.TextObject.DrawParam = id
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} else {
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object.PathObject.DrawParam = id
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object.PathObject.dashPatternSet = true
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}
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}
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return node.update(object)
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}
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// neutralDrawParam 注册可复用的完整默认绘制参数，不改变文档默认颜色空间
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// 返回: string 绘制参数标识, error 错误信息
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func (e *Editor) neutralDrawParam() (string, error) {
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for _, resource := range e.resources {
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if resource.draw != nil {
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return resource.draw.ID, nil
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}
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}
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if err := e.prepareSourceIDs(); err != nil {
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return "", err
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}
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fill, err := e.RGBColor(color.NRGBA{A: 255})
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if err != nil {
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return "", err
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}
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zero := 0.0
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draw := &DrawParam{ID: e.nextID(), LineWidth: defaultPathLineWidth, Cap: "Butt", Join: "Miter", MiterLimit: defaultMiterLimit, DashOffset: &zero, dashPatternSet: true, FillColor: fill, StrokeColor: (*StrokeColor)(fill)}
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data, err := encodeOFDXML(func(x *ofdXML) {
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x.root("Res", ofdAttrs{{Name: xml.Name{Local: "BaseLoc"}, Value: "."}})
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x.start("DrawParams", nil)
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attrs := ofdAttrs{}
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for _, pair := range [][2]string{{"ID", draw.ID}, {"LineWidth", ofdNumber(draw.LineWidth)}, {"Cap", draw.Cap}, {"Join", draw.Join}, {"MiterLimit", ofdNumber(draw.MiterLimit)}, {"DashOffset", "0"}} {
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attrs.add(pair[0], pair[1])
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}
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attrs = append(attrs, xml.Attr{Name: xml.Name{Local: "DashPattern"}, Value: ""})
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x.start("DrawParam", attrs)
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x.color("FillColor", fill)
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x.color("StrokeColor", fill)
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x.end("DrawParam")
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x.end("DrawParams")
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x.end("Res")
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})
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if err != nil {
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return "", err
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}
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resource := editorResource{name: e.resourceDirectory() + "/DrawParam_" + draw.ID + ".xml", data: data, draw: draw}
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if fill.ColorSpace != "" {
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resource.references = []string{fill.ColorSpace}
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}
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e.resources = append(e.resources, resource)
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return draw.ID, nil
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}
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