feat(编辑能力): 完善对象选区与变换，精简界面文案

assets/webui/index.html

@@ -17,8 +17,8 @@
 			<input id="fontDirectoryInput" class="file-input" type="file" webkitdirectory multiple>
 			<div class="tool-group">
 				<button id="ofdButton" class="icon-button" type="button" title="打开" aria-label="打开" aria-keyshortcuts="Control+O Meta+O"><span class="open-icon" aria-hidden="true"></span></button>
-				<button id="newButton" class="icon-button" type="button" title="新建" aria-label="新建文档"><span class="new-icon" aria-hidden="true"></span></button>
+				<button id="newButton" class="icon-button" type="button" title="新建" aria-label="新建"><span class="new-icon" aria-hidden="true"></span></button>
-				<button id="editButton" class="icon-button" type="button" title="编辑文档" aria-label="编辑文档" aria-pressed="false" disabled><span class="edit-icon" aria-hidden="true"></span></button>
+				<button id="editButton" class="icon-button" type="button" title="编辑" aria-label="编辑" aria-pressed="false" disabled><span class="edit-icon" aria-hidden="true"></span></button>
 				<button id="togglePagesButton" class="icon-button" type="button" title="页面栏" aria-label="页面栏" aria-pressed="true">&#9776;</button>
 				<button id="toggleMetaButton" class="icon-button" type="button" title="信息栏" aria-label="信息栏" aria-pressed="true">&#9432;</button>
 			</div>
@@ -40,7 +40,7 @@
 				<button id="fitHeightButton" class="button" type="button" data-short="高" aria-label="适高" disabled>适高</button>
 				<button id="rotateButton" class="button" type="button" data-short="转" title="顺时针旋转90°" aria-label="旋转" disabled>旋转</button>
 				<button id="panButton" class="button" type="button" data-short="拖" title="拖动页面" aria-label="拖动" aria-pressed="false" disabled>拖动</button>
-				<button id="continuousButton" class="button" type="button" data-short="连" title="无距连续显示" aria-label="无距连续显示" aria-pressed="false" disabled>连续</button>
+				<button id="continuousButton" class="button" type="button" data-short="连" title="连续显示" aria-label="连续显示" aria-pressed="false" disabled>连续</button>
 				<button id="annotationButton" class="button" type="button" data-short="注" title="关闭注解" aria-label="关闭注解" aria-pressed="true">注解</button>
 			</div>
 			<div class="tool-group">

assets/webui/ofdgo.js

@@ -2939,7 +2939,7 @@ function copyEditorSelection(event) {
 	const items = canvasEditor.items().slice().sort((a, b) => a.order - b.order);
 	if (!canEditObject(canvasEditor.selected, "copy")) {
 		event.preventDefault();
-		setStatus("当前对象不可复制");
+		setStatus("对象不可复制");
 		return true;
 	}
 	const clipboard = { token: crypto.randomUUID(), page: state.doc.pages[items[0].index].id, offset: 0 };
@@ -2964,7 +2964,7 @@ async function pasteEditorContent(event) {
 	if (token) {
 		const clipboard = state.objectClipboard;
 		if (!clipboard || token !== clipboard.token) {
-			setStatus("对象剪贴板已失效");
+			setStatus("对象剪贴板失效");
 			return;
 		}
 		const openSeq = state.openSeq;
@@ -4418,7 +4418,7 @@ function updateControls() {
 function updateEditorTools() {
 	el.editButton.disabled = !state.doc || !state.ready || state.exporting;
 	el.editButton.setAttribute("aria-pressed", String(state.editing));
-	el.editButton.title = state.editing ? "返回阅读" : "编辑文档";
+	el.editButton.title = state.editing ? "阅读" : "编辑";
 	el.editButton.setAttribute("aria-label", el.editButton.title);
 	el.editNotice.textContent = state.editorInfo?.editWarnings?.join("；") || "";
 	el.editNotice.hidden = !state.editing || !el.editNotice.textContent;

assets/webui/ofdgo_edit.js

@@ -128,7 +128,7 @@ export function objectEditReason(item) {
 		if (!reason) return "";
 		let message = "对象特性暂不支持";
 		if (reason.includes("embedded font")) message = "缺少内嵌字体";
-		else if (reason.includes("does not contain")) message = "字体缺少所需文字";
+		else if (reason.includes("does not contain")) message = "字体缺字";
 		else if (reason.includes("color") || reason.includes("RGB")) message = "颜色样式暂不支持";
 		else if (reason.includes("draw parameter")) message = "绘制参数暂不支持";
 		else if (reason.includes("layer")) message = "图层特性暂不支持";

internal/webui/wasm.go

@@ -655,10 +655,8 @@ func editorObjects(index int, text *ofdgo.PageText) ([]any, error) {
 			switch object.Type {
 			case "TextObject":
 				box = textBoxes[id]
-			case "ImageObject":
+			default:
-				box, err = ofdgo.ParseBox(object.ImageObject.Boundary)
+				box, err = currentSession.Renderer.ObjectBounds(object, layer.DrawParam)
-			case "PathObject":
-				box, err = ofdgo.ParseBox(object.PathObject.Boundary)
 			}
 			if err != nil {
 				continue

ofdgo_editor_batch.go

@@ -499,9 +499,9 @@ func editorObjectID(object GraphicObject) string {
 	return ""
 }
 
-// objectBounds 批量获取对齐范围，每页只度量一次文字。
+// objectBounds 批量获取对齐范围，复用同一渲染器的资源和字形缓存。
 // 入参: page 页面索引, objects 待度量的对象
-// 返回: []Box 对象范围，文字采用字形范围，其余采用Boundary, error 错误信息
+// 返回: []Box 对象范围, error 错误信息
 func (e *Editor) objectBounds(page int, objects []GraphicObject) ([]Box, error) {
 	for _, object := range objects {
 		capability, err := e.ObjectCapabilities(page, editorObjectID(object))
@@ -512,32 +512,17 @@ func (e *Editor) objectBounds(page int, objects []GraphicObject) ([]Box, error)
 			return nil, fmt.Errorf("object %q cannot be arranged: %s", editorObjectID(object), capability.Reason)
 		}
 	}
-	textBoxes := make(map[string]Box)
-	if slices.ContainsFunc(objects, func(o GraphicObject) bool { return o.Type == "TextObject" }) {
 	reader, err := e.Reader()
 	if err != nil {
 		return nil, err
 	}
 	defer reader.Close()
-		text, err := NewRenderer(reader).PageText(&e.pages[page])
+	renderer := NewRenderer(reader)
-		if err != nil {
-			return nil, err
-		}
-		for _, run := range text.Runs {
-			for _, box := range run.Boxes {
-				textBoxes[run.ID] = unionTextBox(textBoxes[run.ID], box)
-			}
-		}
-	}
 	boxes := make([]Box, len(objects))
 	for i, object := range objects {
-		switch object.Type {
+		boxes[i], err = renderer.ObjectBounds(object, "")
-		case "TextObject":
+		if err != nil {
-			boxes[i] = textBoxes[object.TextObject.ID]
+			return nil, err
-		case "PathObject":
-			boxes[i], _ = ParseBox(object.PathObject.Boundary)
-		case "ImageObject":
-			boxes[i], _ = ParseBox(object.ImageObject.Boundary)
 		}
 		if boxes[i].W <= 0 || boxes[i].H <= 0 {
 			return nil, fmt.Errorf("object %q has no visible bounds", editorObjectID(object))

ofdgo_editor_transform.go

@@ -20,14 +20,14 @@ import (
 	"slices"
 )
 
-// RotateObject 绕对象中心旋转，文字采用字形范围，其余对象采用Boundary。
+// RotateObject 绕对象可见范围中心旋转。
 // 入参: page 页面索引, id 对象标识, degrees 顺时针角度
 // 返回: error 错误信息
 func (e *Editor) RotateObject(page int, id string, degrees int) error {
 	return e.RotateObjects(page, []string{id}, degrees)
 }
 
-// RotateObjects 绕同页选区中心旋转，文字采用字形范围，其余对象采用Boundary。
+// RotateObjects 绕同页选区的可见范围中心旋转。
 // 保留相对位置及资源，一次撤销恢复全部。
 // 入参: page 页面索引, ids 对象标识, degrees 顺时针角度，仅支持90度的整数倍
 // 返回: error 错误信息
@@ -40,7 +40,7 @@ func (e *Editor) RotateObjects(page int, ids []string, degrees int) error {
 	return e.orientObjects(page, ids, m)
 }
 
-// FlipObject 绕对象中心镜像，文字采用字形范围，其余对象采用Boundary。
+// FlipObject 绕对象可见范围中心镜像。
 // 入参: page 页面索引, id 对象标识, axis 为horizontal或vertical
 // 返回: error 错误信息
 func (e *Editor) FlipObject(page int, id, axis string) error {
@@ -48,7 +48,7 @@ func (e *Editor) FlipObject(page int, id, axis string) error {
 }
 
 // FlipObjects 以同页选区中心镜像，保留资源及绘制顺序，一次撤销恢复全部。
-// 文字采用字形范围，其余对象采用Boundary。
+// 以对象可见范围计算选区。
 // 入参: page 页面索引, ids 对象标识, axis 为horizontal或vertical
 // 返回: error 错误信息
 func (e *Editor) FlipObjects(page int, ids []string, axis string) error {

ofdgo_renderer_bounds.go

@@ -0,0 +1,148 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// 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.
+
+package ofdgo
+
+import (
+	"fmt"
+	"image"
+
+	"github.com/tdewolff/canvas"
+)
+
+// ObjectBounds 获取文字、路径或图片在页面坐标中的轴对齐范围，不修改对象。
+// 文字采用字形范围，路径包含描边与裁剪，图片采用裁剪后的几何范围，不解码像素或排除透明像素。
+// 底纹按填充或描边轮廓度量，不展开图案单元。
+// 不应用页面边界或父级变换；无可见范围时返回零值，不支持的对象类型返回错误。
+// 入参: object 图形对象, drawParam 图层绘制参数标识，无继承时为空
+// 返回: Box 毫米坐标范围, error 错误信息
+func (r *Renderer) ObjectBounds(object GraphicObject, drawParam string) (Box, error) {
+	if object.Type != "TextObject" && object.Type != "PathObject" && object.Type != "ImageObject" {
+		return Box{}, fmt.Errorf("unsupported object type %q", object.Type)
+	}
+	boundary, ctm := editorGeometry(object)
+	if _, err := creationBox(boundary); err != nil {
+		return Box{}, err
+	}
+	if ctm != "" {
+		if _, err := creationNumbers(ctm, 6); err != nil {
+			return Box{}, err
+		}
+	}
+	renderer := *r
+	renderer.pageText = nil
+	renderer.textOnly = false
+	defaults := renderer.drawParamDefaults(drawParam, nil)
+	bounds := &boundsRenderer{}
+	ctx := canvas.NewContext(bounds)
+	switch object.Type {
+	case "TextObject":
+		renderer.pageText = &PageText{}
+		renderer.textOnly = true
+		renderer.renderText(ctx, object.TextObject, 0, defaults, nil, false, nil)
+		var box Box
+		for _, run := range renderer.pageText.Runs {
+			for _, glyph := range run.Boxes {
+				box = unionTextBox(box, glyph)
+			}
+		}
+		return box, nil
+	case "PathObject":
+		obj := object.PathObject
+		defaults = renderer.drawParamDefaults(obj.DrawParam, defaults)
+		obj.DrawParam = ""
+		if defaults != nil {
+			style := *defaults
+			style.FillColor = boundsColor(style.FillColor)
+			style.StrokeColor = (*StrokeColor)(boundsColor((*FillColor)(style.StrokeColor)))
+			defaults = &style
+		}
+		obj.FillColor = boundsColor(obj.FillColor)
+		obj.StrokeColor = (*StrokeColor)(boundsColor((*FillColor)(obj.StrokeColor)))
+		renderer.renderPath(ctx, obj, 0, defaults, nil, false, nil)
+	case "ImageObject":
+		obj := object.ImageObject
+		if obj.Visible != nil && !*obj.Visible || obj.Alpha != nil && *obj.Alpha == 0 {
+			return Box{}, nil
+		}
+		box, _ := ParseBox(obj.Boundary)
+		ctm := NewMatrix(obj.CTM)
+		if obj.CTM == "" {
+			ctm = Matrix{a: box.W, d: box.H}
+		}
+		p := canvas.Rectangle(1, 1).Transform(canvas.Matrix{{ctm.a, ctm.c, box.X + ctm.e}, {-ctm.b, -ctm.d, -box.Y - ctm.f}})
+		clip := renderer.buildObjectClipPath(obj.Clips, 0, box.X, box.Y, ctm, nil, false)
+		bounds.add(applyClipPath(p, clip))
+		if obj.Border != nil {
+			border := *obj.Border
+			border.BorderColor = (*StrokeColor)(boundsColor((*FillColor)(border.BorderColor)))
+			obj.Border = &border
+			renderer.renderImageBorder(ctx, obj, box, 0, nil, false, clip)
+		}
+	}
+	return bounds.box, nil
+}
+
+// boundsColor 以底纹的基础颜色和透明度度量轮廓，不修改原画刷。
+// 入参: color 填充或描边颜色
+// 返回: *FillColor 用于度量的颜色
+func boundsColor(color *FillColor) *FillColor {
+	if color == nil || color.Pattern == nil {
+		return color
+	}
+	return &FillColor{Value: color.Value, Index: color.Index, ColorSpace: color.ColorSpace, Alpha: color.Alpha}
+}
+
+// boundsRenderer 收集绘制范围，不分配页面像素或合并独立图形轮廓。
+type boundsRenderer struct {
+	box Box
+}
+
+// Size 返回不限定边界的度量画布尺寸。
+// 返回: float64 宽度, float64 高度
+func (r *boundsRenderer) Size() (float64, float64) {
+	return 0, 0
+}
+
+// add 合并路径的精确曲线范围并转换为向下的纵轴。
+// 入参: path 绘制路径
+func (r *boundsRenderer) add(path *canvas.Path) {
+	if path.Empty() {
+		return
+	}
+	rect := path.Bounds()
+	r.box = unionTextBox(r.box, Box{X: rect.X0, Y: -rect.Y1, W: rect.W(), H: rect.H()})
+}
+
+// RenderPath 收集填充与描边范围，保持线帽、连接和虚线语义。
+// 入参: path 路径, style 绘制样式, m 变换矩阵
+func (r *boundsRenderer) RenderPath(path *canvas.Path, style canvas.Style, m canvas.Matrix) {
+	if style.HasFill() {
+		r.add(path.Copy().Transform(m))
+	}
+	if style.HasStroke() {
+		p := path.Dash(style.DashOffset, style.Dashes...).Stroke(style.StrokeWidth, style.StrokeCapper, style.StrokeJoiner, canvas.Tolerance)
+		r.add(p.Transform(m))
+	}
+}
+
+// RenderText 收集绘制文字范围。
+// 入参: text 文字, m 变换矩阵
+func (r *boundsRenderer) RenderText(text *canvas.Text, m canvas.Matrix) {
+	text.RenderTo(r, m, 0)
+}
+
+// RenderImage 度量不展开底纹图片。
+// 入参: img 图片, m 变换矩阵
+func (r *boundsRenderer) RenderImage(img image.Image, m canvas.Matrix) {}