mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-30 01:27:26 +08:00
300 lines
10 KiB
Go
300 lines
10 KiB
Go
// 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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"fmt"
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"math"
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"reflect"
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"slices"
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"strings"
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)
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// EraseObjects 擦除同页对象与矩形区域重叠的可见部分，一次撤销恢复全部
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// 全部覆盖时删除对象；局部覆盖使用OFD路径裁剪，保留原文字和资源，不用于敏感信息脱敏
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// 不改变未相交对象，无法保真编辑时返回错误且不提交修改
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// 入参: page 页面索引, ids 对象标识, box 页面毫米坐标中的擦除范围
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// 返回: error 错误信息
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func (e *Editor) EraseObjects(page int, ids []string, box Box) error {
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if _, err := creationBox(editorBoxString(box)); err != nil {
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return err
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}
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return e.eraseObjects(page, ids, box, nil, nil)
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}
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// EraseObjectsPath 擦除同页对象与闭合折线区域重叠的可见部分，末点自动连接起点
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// 自交区域使用奇偶规则；复用矩形擦除的裁剪、原子修改和撤销逻辑，不用于敏感信息脱敏
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// 入参: page 页面索引, ids 对象标识, points 页面毫米坐标，至少三个点
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// 返回: error 错误信息
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func (e *Editor) EraseObjectsPath(page int, ids []string, points []Point) error {
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region, err := e.editorEraseRegion(points)
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if err != nil || len(region) == 0 {
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return err
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}
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bounds, err := e.backends.Geometry.Bounds(region)
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if err != nil {
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return err
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}
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return e.eraseObjects(page, ids, bounds, points, region)
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}
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// EraseCompositeObjects 擦除内部成员与矩形相交的部分，保留原始属性及共享资源
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// 全部覆盖时删除成员，部分覆盖追加标准裁剪，不用于敏感信息脱敏
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// 入参: page 页面索引, path 父路径, indexes 成员序号, box 页面毫米范围
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// 返回: error 错误信息
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func (e *Editor) EraseCompositeObjects(page int, path ObjectPath, indexes []int, box Box) error {
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if _, err := creationBox(editorBoxString(box)); err != nil {
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return err
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}
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return e.eraseCompositeObjects(page, path, indexes, geometryRectangle(box))
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}
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// EraseCompositeObjectsPath 按闭合折线擦除内部成员，末点自动连接起点
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// 与矩形擦除共用原子提交和撤销逻辑，不用于敏感信息脱敏
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// 入参: page 页面索引, path 父路径, indexes 成员序号, points 页面毫米坐标
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// 返回: error 错误信息
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func (e *Editor) EraseCompositeObjectsPath(page int, path ObjectPath, indexes []int, points []Point) error {
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region, err := e.editorEraseRegion(points)
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if err != nil || len(region) == 0 {
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return err
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}
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return e.eraseCompositeObjects(page, path, indexes, region)
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}
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// editorEraseRegion 校验闭合折线并按奇偶规则构建擦除区域
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// 入参: points 页面毫米坐标
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// 返回: GeometryPath 擦除区域, error 错误信息
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func (e *Editor) editorEraseRegion(points []Point) (GeometryPath, error) {
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geometry, err := e.Geometry()
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if err != nil {
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return nil, err
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}
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if len(points) < 3 {
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return nil, fmt.Errorf("erase path requires at least three points")
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}
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region := make(GeometryPath, 0, len(points)+1)
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for i, point := range points {
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if !finite(point.X) || !finite(point.Y) {
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return nil, fmt.Errorf("invalid erase path point %d", i)
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}
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verb := GeometryLine
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if i == 0 {
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verb = GeometryMove
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}
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region = append(region, GeometrySegment{Verb: verb, End: point})
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}
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region = append(region, GeometrySegment{Verb: GeometryClose, End: points[0]})
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return geometry.Normalize(region, true)
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}
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// eraseCompositeObjects 按页面区域裁剪内部成员，全部成功后提交一次历史
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// 入参: page 页面索引, path 父路径, indexes 成员序号, region 擦除区域
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// 返回: error 错误信息
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func (e *Editor) eraseCompositeObjects(page int, path ObjectPath, indexes []int, region GeometryPath) error {
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geometry, err := e.Geometry()
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if err != nil {
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return err
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}
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return e.editCompositeObjects(page, path, indexes, func(_ *Renderer, nodes []*editorCompositeNode, members []CompositeMember) error {
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for i, node := range nodes {
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box := members[i].Bounds
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if box.W <= 0 || box.H <= 0 {
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continue
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}
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bounds := geometryRectangle(box)
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intersection, err := geometry.Combine(bounds, region, GeometryIntersect)
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if err != nil {
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return err
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}
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if len(intersection) == 0 {
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continue
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}
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remainder, err := geometry.Combine(bounds, region, GeometrySubtract)
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if err != nil {
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return err
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}
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if len(remainder) == 0 {
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node.owner.patches = append(node.owner.patches, editorXMLPatch{node.span.start, node.span.end, nil})
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continue
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}
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if !members[i].Capabilities.Arrange {
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return fmt.Errorf("composite member cannot be erased")
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}
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clips := *editorObjectClips(&node.object)
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inverse, ok := node.matrix(clips.usesObjectMatrix()).Invert()
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if !ok {
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return fmt.Errorf("composite clip transform is not invertible")
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}
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outer := geometryRectangle(Box{X: box.X - 1, Y: box.Y - 1, W: box.W + 2, H: box.H + 2})
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remainder, err = geometry.Combine(outer, region, GeometrySubtract)
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if err != nil {
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return err
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}
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shape, err := geometryClipPath(remainder)
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if err != nil {
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return err
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}
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if err := appendCompositeClip(node, shape, inverse, false); err != nil {
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return err
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}
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}
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return nil
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})
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}
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// eraseObjects 按矩形或闭合路径裁剪对象，只在全部对象处理成功后提交修改
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// 入参: page 页面索引, ids 对象标识, box 区域边界, points 折线点, region 奇偶填充后的路径
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// 返回: error 错误信息
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func (e *Editor) eraseObjects(page int, ids []string, box Box, points []Point, region GeometryPath) error {
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objects, indexes, err := e.selectedObjects(page, ids)
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if err != nil || len(objects) == 0 {
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return err
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}
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boxes, err := e.objectBounds(page, objects)
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if err != nil {
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return err
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}
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layers := copyEditorPage(e.pages[page]).Content.Layer
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removed := make(map[string]bool)
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changed := false
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for i, object := range objects {
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bounds := boxes[i]
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x, y := math.Max(box.X, bounds.X), math.Max(box.Y, bounds.Y)
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right, bottom := math.Min(box.X+box.W, bounds.X+bounds.W), math.Min(box.Y+box.H, bounds.Y+bounds.H)
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if right <= x || bottom <= y {
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continue
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}
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covered := x == bounds.X && y == bounds.Y && right == bounds.X+bounds.W && bottom == bounds.Y+bounds.H
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if region != nil {
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path := geometryRectangle(bounds)
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intersection, err := e.backends.Geometry.Combine(path, region, GeometryIntersect)
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if err != nil {
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return err
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}
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if len(intersection) == 0 {
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continue
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}
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remainder, err := e.backends.Geometry.Combine(path, region, GeometrySubtract)
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if err != nil {
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return err
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}
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covered = len(remainder) == 0
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}
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if covered {
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removed[ids[i]] = true
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changed = true
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continue
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}
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object, err := cloneEditorObject(object)
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if err != nil {
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return err
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}
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boundary, ctm := editorGeometry(object)
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frame, _ := ParseBox(boundary)
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outer := unionTextBox(bounds, frame)
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outer.X, outer.Y, outer.W, outer.H = outer.X-1, outer.Y-1, outer.W+2, outer.H+2
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x, y = math.Max(box.X, outer.X), math.Max(box.Y, outer.Y)
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right, bottom = math.Min(box.X+box.W, outer.X+outer.W), math.Min(box.Y+box.H, outer.Y+outer.H)
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clips := editorObjectClips(&object)
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if *clips == nil {
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*clips = &Clips{}
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}
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matrix := IdentityMatrix
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if (*clips).usesObjectMatrix() {
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if object.Type == "ImageObject" && ctm == "" {
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ctm = Matrix{a: frame.W, d: frame.H}.String()
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}
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var ok bool
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matrix, ok = NewMatrix(ctm).Invert()
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if !ok {
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return fmt.Errorf("object %q transform is not invertible", ids[i])
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}
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}
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clip := Clip{}
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areas := []Box{
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{X: outer.X, Y: outer.Y, W: outer.W, H: y - outer.Y},
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{X: outer.X, Y: bottom, W: outer.W, H: outer.Y + outer.H - bottom},
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{X: outer.X, Y: y, W: x - outer.X, H: bottom - y},
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{X: right, Y: y, W: outer.X + outer.W - right, H: bottom - y},
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}
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if region != nil {
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areas = []Box{unionTextBox(outer, box)}
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}
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for _, area := range areas {
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if area.W <= 0 || area.H <= 0 {
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continue
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}
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area.X, area.Y = area.X-frame.X, area.Y-frame.Y
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path, err := NewShape(ShapeRectangle, area)
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if err != nil {
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return err
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}
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fill, stroke := true, false
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path.Fill, path.Stroke = &fill, &stroke
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if region != nil {
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var data strings.Builder
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data.WriteString(path.AbbreviatedData)
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for i, point := range points {
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command := "L"
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if i == 0 {
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command = "M"
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}
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fmt.Fprintf(&data, " %s %g %g", command, point.X-frame.X-area.X, point.Y-frame.Y-area.Y)
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}
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data.WriteString(" C")
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path.AbbreviatedData, path.Rule = data.String(), "Even-Odd"
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}
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clip.Area = append(clip.Area, ClipArea{CTM: matrix.String(), Path: []PathObject{path}})
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}
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if slices.ContainsFunc((*clips).Clip, func(previous Clip) bool { return reflect.DeepEqual(previous, clip) }) {
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continue
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}
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(*clips).Clip = append((*clips).Clip, clip)
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changed = true
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position := indexes[i]
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layers[position.layer].Objects[position.index] = object
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}
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if changed {
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for i := range layers {
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objects := layers[i].Objects[:0]
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for _, object := range layers[i].Objects {
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if !removed[editorObjectID(object)] {
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objects = append(objects, object)
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}
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}
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layers[i].Objects = objects
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}
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e.replaceLayers(page, layers)
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}
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return nil
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}
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// editorObjectClips 获取基本对象的裁剪字段
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// 入参: object 文字、路径、图片或复合对象
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// 返回: **Clips 裁剪字段地址，不支持的对象返回nil
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func editorObjectClips(object *GraphicObject) **Clips {
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switch object.Type {
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case "TextObject":
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return &object.TextObject.Clips
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case "PathObject":
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return &object.PathObject.Clips
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case "ImageObject":
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return &object.ImageObject.Clips
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case "CompositeObject", "CompositeGraphicUnit":
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return &object.CompositeGraphicUnit.Clips
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}
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return nil
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}
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