diff --git a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj index 4041213..d7932a1 100644 --- a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj +++ b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj @@ -157,6 +157,7 @@ + diff --git a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj.filters b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj.filters index b43e857..ec634e5 100644 --- a/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj.filters +++ b/ArchitectureColoredPainting/ArchitectureColoredPainting.vcxproj.filters @@ -97,6 +97,9 @@ Form Files + + Form Files + @@ -222,9 +225,6 @@ Source Files\Editor - - Source Files\Editor - Source Files\Editor @@ -261,6 +261,9 @@ Source Files + + Source Files\Editor + diff --git a/ArchitectureColoredPainting/EditorLayerInfoWidget.ui b/ArchitectureColoredPainting/EditorLayerInfoWidget.ui new file mode 100644 index 0000000..7918384 --- /dev/null +++ b/ArchitectureColoredPainting/EditorLayerInfoWidget.ui @@ -0,0 +1,92 @@ + + + EditorLayerInfoWidget + + + + 0 + 0 + 333 + 321 + + + + + + + + + + true + + + + + + + false + + + + + + + false + + + + + + + false + + + + + + + false + + + + + + + false + + + + + + + 水平翻转 + + + + + + + 竖直翻转 + + + + + + + + + + + QtMaterialTextField + QLineEdit +
qtmaterialtextfield.h
+ + + QtMaterialCheckBox + QCheckBox +
qtmaterialcheckbox.h
+ + + + + diff --git a/ArchitectureColoredPainting/res/Shaders/element.comp b/ArchitectureColoredPainting/res/Shaders/element.comp index 511c470..e8c1ca6 100644 --- a/ArchitectureColoredPainting/res/Shaders/element.comp +++ b/ArchitectureColoredPainting/res/Shaders/element.comp @@ -1131,14 +1131,8 @@ void main() { vec2 pTemp = path[pathIndex + 1]; if (isinf(pTemp.x)) - { - if(endType == 4) - { - //onVeryEnd = false; - tangentBeginNext = tangentFirstBegin; - } - else - onVeryEnd = true; + { + onVeryEnd = true; } else { @@ -1151,7 +1145,16 @@ void main() } } else - onVeryEnd = true; + { + if(endType == 4) + { + //onVeryEnd = false; + tangentBeginNext = tangentFirstBegin; + } + else + onVeryEnd = true; + } + float d = cubic_bezier_dis(localUV, p[0], p[1], p[2], p[3], true); if (d <= strokeWidth) @@ -1199,7 +1202,7 @@ void main() } } tangentEndLast = tangentEnd; - if(pathIndex == 0) + if(pathIndex == 4) tangentFirstBegin = tangentBegin; } p3Last = p[3]; diff --git a/ArchitectureColoredPainting/src/Editor/ElementPoolWidget.cpp b/ArchitectureColoredPainting/src/Editor/ElementPoolWidget.cpp index 74453d0..95825e1 100644 --- a/ArchitectureColoredPainting/src/Editor/ElementPoolWidget.cpp +++ b/ArchitectureColoredPainting/src/Editor/ElementPoolWidget.cpp @@ -3,6 +3,7 @@ #include #include #include +#include ElementPoolWidget::ElementPoolWidget(QWidget* parent) : QWidget(parent) @@ -125,7 +126,12 @@ void ElementPoolWidget::popMenu(const QPoint& pos) { menu->addAction(QString::fromLocal8Bit("Ԫأsvg룩"), this, [this]() { QString filePath = QFileDialog::getOpenFileName(this, QString::fromLocal8Bit("ļ"), "", "SVG Files (*.svg)"); + filePath = filePath.trimmed(); QFileInfo fileInfo(filePath); + if (!fileInfo.exists() || !fileInfo.isFile()) { + QMessageBox::warning(this, tr("Error"), QString::fromLocal8Bit("ѡSvgļ")); + return; + } QString fileName = fileInfo.fileName(); qDebug() << fileName << " " << filePath; this->elementManager->createSimpleElement(fileName, filePath); diff --git a/ArchitectureColoredPainting/src/Editor/PixelPath.cpp b/ArchitectureColoredPainting/src/Editor/PixelPath.cpp index e673504..7eaf51d 100644 --- a/ArchitectureColoredPainting/src/Editor/PixelPath.cpp +++ b/ArchitectureColoredPainting/src/Editor/PixelPath.cpp @@ -41,6 +41,7 @@ void PixelPath::addPath(const PixelPath& path) QPainter painter(&pixmap); painter.drawPixmap(0, 0, path.getPixmap()); this->painterPath.addPath(path.getPainterPath()); + this->originPath.addPath(path.originPath); boundingRect = boundingRect.united(path.getBoundingRect()); } @@ -52,6 +53,7 @@ void PixelPath::addPath(const QPainterPath& path) painter.setPen(QPen(Qt::black,1)); painter.drawPath(path); this->painterPath.addPath(path); + this->originPath.addPath(path); boundingRect = boundingRect.united(path.boundingRect()); } @@ -67,6 +69,7 @@ void PixelPath::clear() pixmap.fill(Qt::transparent); boundingRect = QRectF(0, 0, 0, 0); painterPath.clear(); + originPath.clear(); } PixelPath PixelPath::trans(QTransform& mat)const @@ -78,6 +81,7 @@ PixelPath PixelPath::trans(QTransform& mat)const painter.setTransform(mat); painter.drawPixmap(0, 0, pixmap); result.painterPath.addPath(this->painterPath); + result.originPath.addPath(this->painterPath); result.painterPath = mat.map(result.painterPath); result.boundingRect = result.painterPath.boundingRect(); return result; diff --git a/ArchitectureColoredPainting/src/Editor/PixelPath.h b/ArchitectureColoredPainting/src/Editor/PixelPath.h index c3dc704..894ac63 100644 --- a/ArchitectureColoredPainting/src/Editor/PixelPath.h +++ b/ArchitectureColoredPainting/src/Editor/PixelPath.h @@ -10,7 +10,7 @@ class PixelPath public: QRectF boundingRect; QPixmap pixmap; - QPainterPath painterPath; + QPainterPath painterPath, originPath; int w,h; public: PixelPath(int w=16, int h= 16); diff --git a/ArchitectureColoredPainting/src/Editor/PreviewWindow.cpp b/ArchitectureColoredPainting/src/Editor/PreviewWindow.cpp index 7745de2..6cc9e27 100644 --- a/ArchitectureColoredPainting/src/Editor/PreviewWindow.cpp +++ b/ArchitectureColoredPainting/src/Editor/PreviewWindow.cpp @@ -1,61 +1,61 @@ #include "PreviewWindow.h" #include -PreviewWindow::PreviewWindow(QWidget *parent) : QOpenGLWidget(parent) +PreviewWindow::PreviewWindow(QWidget* parent) : QOpenGLWidget(parent) { - //this->setFixedSize(QSize(108, 108)); - this->setStyleSheet("border: 1px solid black"); - this->renderer = Renderer::ElementRenderer::instance(); - QSurfaceFormat surfaceFormat; - surfaceFormat.setSamples(16); - setFormat(surfaceFormat); - painter = new QPainter(this); - painter->setRenderHint(QPainter::SmoothPixmapTransform); - painter->setRenderHint(QPainter::HighQualityAntialiasing); - layerManager = nullptr; - currentLayer = nullptr; - zoomStep = 0; + //this->setFixedSize(QSize(108, 108)); + this->setStyleSheet("border: 1px solid black"); + this->renderer = Renderer::ElementRenderer::instance(); + QSurfaceFormat surfaceFormat; + surfaceFormat.setSamples(16); + setFormat(surfaceFormat); + painter = new QPainter(this); + painter->setRenderHint(QPainter::SmoothPixmapTransform); + painter->setRenderHint(QPainter::HighQualityAntialiasing); + layerManager = nullptr; + currentLayer = nullptr; + zoomStep = 0; backgroundColor = QColor(255, 255, 255, 255); } -void PreviewWindow::initialize(LayerManager *layerManager,QSize windowSize) +void PreviewWindow::initialize(LayerManager* layerManager, QSize windowSize) { this->logicalSize = windowSize; - this->layerManager = layerManager; + this->layerManager = layerManager; this->setFixedSize(windowSize); } void PreviewWindow::show() { - //QFile settingFile; - //settingFile.setFileName("../data.json"); - //settingFile.open(QFile::ReadOnly); - //QByteArray setting = settingFile.readAll().trimmed(); - //QJsonDocument jsonDoc(QJsonDocument::fromJson(setting)); - //auto jElements = jsonDoc.object().value("elements").toArray(); + //QFile settingFile; + //settingFile.setFileName("../data.json"); + //settingFile.open(QFile::ReadOnly); + //QByteArray setting = settingFile.readAll().trimmed(); + //QJsonDocument jsonDoc(QJsonDocument::fromJson(setting)); + //auto jElements = jsonDoc.object().value("elements").toArray(); - //for (auto &&ele : jElements) - //{ - // SimpleElement element(ele.toObject()); - // painter->drawPath(element.getPaintObject()); - //} + //for (auto &&ele : jElements) + //{ + // SimpleElement element(ele.toObject()); + // painter->drawPath(element.getPaintObject()); + //} } void PreviewWindow::initializeGL() { - initializeOpenGLFunctions(); + initializeOpenGLFunctions(); } void PreviewWindow::paintGL() { glClearColor(backgroundColor.redF(), backgroundColor.greenF(), backgroundColor.blueF(), backgroundColor.alphaF()); - glClear(GL_COLOR_BUFFER_BIT); - painter->begin(this); - painter->setWindow(0, 0, logicalSize.width(), logicalSize.height()); - painter->setRenderHint(QPainter::Antialiasing); - painter->setRenderHint(QPainter::HighQualityAntialiasing); - layerManager->paint(painter,this->size(),currentLayer); - painter->end(); + glClear(GL_COLOR_BUFFER_BIT); + painter->begin(this); + painter->setWindow(0, 0, logicalSize.width() * devicePixelRatioF(), logicalSize.height() * devicePixelRatioF()); + painter->setRenderHint(QPainter::Antialiasing); + painter->setRenderHint(QPainter::HighQualityAntialiasing); + layerManager->paint(painter, this->size(), currentLayer); + painter->end(); } void PreviewWindow::resizeGL(int w, int h) @@ -63,64 +63,64 @@ void PreviewWindow::resizeGL(int w, int h) } Renderer::ElementRenderer* const PreviewWindow::getRenderer()const { - return this->renderer; + return this->renderer; } void PreviewWindow::currentLayerChanged(LayerWrapper* layer) { - this->currentLayer = layer; + this->currentLayer = layer; } void PreviewWindow::refresh() { - this->repaint(); + this->repaint(); } void PreviewWindow::mousePressEvent(QMouseEvent* event) { - // 갴ʱ¼ǰλ - m_lastPos = event->pos(); + // 갴ʱ¼ǰλ + m_lastPos = event->pos(); } void PreviewWindow::mouseMoveEvent(QMouseEvent* event) { - // ƶʱƶľ룬Ҫͼε״̬ - int dx = event->x() - m_lastPos.x(); - int dy = event->y() - m_lastPos.y(); - if (currentLayer != nullptr) { - if (QApplication::keyboardModifiers() == Qt::ControlModifier && (event->buttons() & Qt::LeftButton)) - { - currentLayer->property.scale.setX(std::max(0.0, currentLayer->property.scale.x() + dx / 50.0)); - currentLayer->property.scale.setY(std::max(0.0, currentLayer->property.scale.y() + dy / 50.0)); - } - else if (QApplication::keyboardModifiers() == (Qt::ControlModifier | Qt::ShiftModifier) && (event->buttons() & Qt::LeftButton)) - { - currentLayer->property.scale.setX(std::max(0.0, currentLayer->property.scale.x() * (1.0 + dx / 50.0))); - currentLayer->property.scale.setY(std::max(0.0, currentLayer->property.scale.y() * (1.0 + dx / 50.0))); - } - else if (event->buttons() & Qt::LeftButton) { - // µôƽͼ + // ƶʱƶľ룬Ҫͼε״̬ + int dx = event->x() - m_lastPos.x(); + int dy = event->y() - m_lastPos.y(); + if (currentLayer != nullptr) { + if (QApplication::keyboardModifiers() == Qt::ControlModifier && (event->buttons() & Qt::LeftButton)) + { + currentLayer->property.scale.setX(std::max(0.0, currentLayer->property.scale.x() + dx / 50.0)); + currentLayer->property.scale.setY(std::max(0.0, currentLayer->property.scale.y() + dy / 50.0)); + } + else if (QApplication::keyboardModifiers() == (Qt::ControlModifier | Qt::ShiftModifier) && (event->buttons() & Qt::LeftButton)) + { + currentLayer->property.scale.setX(std::max(0.0, currentLayer->property.scale.x() * (1.0 + dx / 50.0))); + currentLayer->property.scale.setY(std::max(0.0, currentLayer->property.scale.y() * (1.0 + dx / 50.0))); + } + else if (event->buttons() & Qt::LeftButton) { + // µôƽͼ currentLayer->property.offset.setX(currentLayer->property.offset.x() + dx); currentLayer->property.offset.setY(currentLayer->property.offset.y() + dy); - } + } else if (event->buttons() & Qt::RightButton) { - // µҼôתͼ - qreal angle = dx; + // µҼôתͼ + qreal angle = dx; currentLayer->property.rotation += angle; - } - auto layer = currentLayer; - while (layer != nullptr) - { - auto index = -1; - if (typeid(*layer) == typeid(FolderLayerWrapper)) - index = dynamic_cast(layer)->getReferencedBy(); - layer = layer->getParent(); - } - } - // һελ - emit triggerCentralRefresh(); - m_lastPos = event->pos(); - this->repaint(); + } + auto layer = currentLayer; + while (layer != nullptr) + { + auto index = -1; + if (typeid(*layer) == typeid(FolderLayerWrapper)) + index = dynamic_cast(layer)->getReferencedBy(); + layer = layer->getParent(); + } + } + // һελ + emit triggerCentralRefresh(); + m_lastPos = event->pos(); + this->repaint(); } void PreviewWindow::mouseReleaseEvent(QMouseEvent* event) @@ -131,23 +131,23 @@ void PreviewWindow::mouseReleaseEvent(QMouseEvent* event) void PreviewWindow::setBackgroundColor(QColor color) { this->backgroundColor = color; - this->repaint(); + this->repaint(); } void PreviewWindow::wheelEvent(QWheelEvent* event) { - if (QApplication::keyboardModifiers() == Qt::ControlModifier) - { + if (QApplication::keyboardModifiers() == Qt::ControlModifier) + { if (event->delta() > 0 && zoomStep < ZOOM_STEP_MAX) { zoomStep++; this->setFixedSize(logicalSize * (1 + zoomStep * ZOOM_RATE)); } - else if(event->delta() < 0 && zoomStep > ZOOM_STEP_MIN) + else if (event->delta() < 0 && zoomStep > ZOOM_STEP_MIN) { zoomStep--; - this->setFixedSize(logicalSize * (1 + zoomStep * ZOOM_RATE)); + this->setFixedSize(logicalSize * (1 + zoomStep * ZOOM_RATE)); } this->repaint(); - } + } } \ No newline at end of file diff --git a/ArchitectureColoredPainting/src/Editor/util/PaintingUtil.cpp b/ArchitectureColoredPainting/src/Editor/util/PaintingUtil.cpp index 0b84c07..6c92dcf 100644 --- a/ArchitectureColoredPainting/src/Editor/util/PaintingUtil.cpp +++ b/ArchitectureColoredPainting/src/Editor/util/PaintingUtil.cpp @@ -79,34 +79,38 @@ FolderLayerWrapper* PaintingUtil::handleLayerWrapper(LayerWrapper* nowLayer, QTr } PixelPath pixelPath = nowLayer->getCache(); - QPainterPath painterPath = pixelPath.getPainterPath(); + QPainterPath painterPath = pixelPath.originPath; QRectF bound = painterPath.boundingRect(); //qDebug() << leafLayer<<"------" << painterPath; // transform to -1 1 QTransform trans; - double maxLen = std::max(bound.width(), bound.height()); + double maxLen = std::max(bound.width(), bound.height()) * 1.00001; qDebug() << maxLen << bound; trans.scale(1 / maxLen, 1 / maxLen); trans.translate(-bound.center().x(), -bound.center().y()); painterPath = trans.map(painterPath); shared_ptr >> contour = std::make_shared >>(PainterPathUtil::transformToLines(painterPath)); - QSize screenSize = QSize(1024, 1024); + QSize screenSize = QSize(1080, 1080); ElementTransform elementTransform; transform = trans.inverted() * transform * QTransform::fromScale(2. / screenSize.width(), 2. / screenSize.height()) * QTransform::fromTranslate(-1, -1) * QTransform::fromScale(1, -1); auto baseStyles = leafLayer->styles.toBaseStyles(); - Renderer::BaseElement element; - element.contour = contour; + for (auto& baseStyle : baseStyles) { double lineWidth = 0; + + std::shared_ptr material; + if (baseStyle.material->type() == Renderer::MaterialStyleType::kStroke) { - auto material = std::static_pointer_cast(baseStyle.material); - material->halfWidth /= maxLen; - lineWidth = material->halfWidth; - qDebug() << material->halfWidth; + std::shared_ptr copy = baseStyle.material->clone(); + std::static_pointer_cast(copy)->halfWidth /= maxLen; + lineWidth = std::static_pointer_cast(copy)->halfWidth; + material = copy; } + else + material = baseStyle.material; QPainterPathStroker stroker; stroker.setWidth(lineWidth * 2); stroker.setCapStyle(Qt::RoundCap); @@ -114,17 +118,14 @@ FolderLayerWrapper* PaintingUtil::handleLayerWrapper(LayerWrapper* nowLayer, QTr QPainterPath strokePath = stroker.createStroke(painterPath); auto rect = transform.map(strokePath).boundingRect(); elementTransform.bound = glm::vec4(rect.x(), rect.y(), rect.x() + rect.width(), rect.y() + rect.height()); - qDebug() << elementTransform.bound.x << elementTransform.bound.y << elementTransform.bound.z << elementTransform.bound.z; + //qDebug() << elementTransform.bound.x << elementTransform.bound.y << elementTransform.bound.z << elementTransform.bound.z; transform = transform.inverted(); elementTransform.transform = glm::mat3x2( transform.m11(), transform.m12(), transform.m21(), transform.m22(), transform.m31(), transform.m32() ); - //qDebug() << transform; elementTransform.zIndex = 0; - - element.style = baseStyle.material; - painting.addElement(element, elementTransform); + painting.addElement(BaseElement{ contour, material }, elementTransform); } return nullptr; diff --git a/UnitTest/ElementRendererTest.cpp b/UnitTest/ElementRendererTest.cpp index 5760980..c1c12ab 100644 --- a/UnitTest/ElementRendererTest.cpp +++ b/UnitTest/ElementRendererTest.cpp @@ -4,6 +4,7 @@ #include "ElementRendererTest.h" #include "Renderer/Painting/ElementStyle.h" #include "Renderer/Painting/MaterialStyleFill.h" +#include "Editor/util/SvgFileLoader.h" using namespace Microsoft::VisualStudio::CppUnitTestFramework; using namespace Renderer; @@ -203,6 +204,30 @@ namespace UnitTest w.show(); a.exec(); } + TEST_METHOD(TestBothSidesClosed) + { + QPainterPath closedPath; + SvgFileLoader().loadSvgFile("../../svg/4_L0.svg", closedPath); + closedPath = QTransform::fromScale(5, 5).map(closedPath); + QApplication a(argc, argv); + class StyleStrokeRadialGradient : public Renderer::ElementStyle + { + virtual std::vector toBaseStyles() const override + { + std::map materialMap = { + {0.20, Material{QColor(255,255,255)}}, + {0.60, Material{QColor(165,176,207)}}, + {1.00, Material{QColor(58,64,151)}} + }; + return { BaseStyle(std::make_shared(), + std::make_shared(20, StrokeType::kLeftSide, StrokeEndType::kClosed, + std::make_shared(materialMap, false))) }; + } + } style; + TestGLWidget w(style, closedPath); + w.show(); + a.exec(); + } }; TEST_CLASS(ElementRendererStokeMaterialTest) diff --git a/test.json b/test.json index c5158fb..ea5c1ae 100644 --- a/test.json +++ b/test.json @@ -3,7 +3,7 @@ "elements": [ { "data": { - "include": "../svg/2.svg" + "include": "/svg/2.svg" }, "name": "ababa", "type": "svg-file" @@ -17,10 +17,17 @@ }, { "data": { - "include": "../svg/0.svg" + "include": "/svg/0.svg" }, "name": "ababa2", "type": "svg-file" + }, + { + "data": { + "include": "/svg/4_L0.svg" + }, + "name": "4_L0.svg", + "type": "svg-file" } ], "height": 1080, @@ -29,46 +36,22 @@ "children": [ { "children": [ - { - "element": 0, - "is-folder": false, - "name": "Leaf1", - "styles": [ - { - "enableEachSideIndependent": false, - "left": "AAAAQAEAIZwAf///qqr//w==", - "right": "AADgQAAACJw=", - "type": "stroke" - } - ], - "transform": { - "offset": { - "x": 0, - "y": 0 - }, - "rotation": 0, - "scale": { - "x": 1, - "y": 1 - } - } - }, { "element": 0, "is-folder": false, "name": "Leaf2", "styles": [ { - "enableEachSideIndependent": false, - "left": "AAAAQAEAIZwAf////1UA/w==", - "right": "AADgQAEACJwAf///AFqe/w==", + "enableEachSideIndependent": true, + "left": "AABAQAEAIZwAf///AFqe/w==", + "right": "AABAQAAACJw=", "type": "stroke" } ], "transform": { "offset": { - "x": 150, - "y": 0 + "x": 501, + "y": -3 }, "rotation": 0, "scale": { @@ -83,8 +66,8 @@ "referenced-by": 1, "transform": { "offset": { - "x": 50, - "y": 50 + "x": 503, + "y": 36 }, "rotation": 0, "scale": { @@ -96,15 +79,73 @@ { "element": 1, "is-folder": false, - "name": "ReferencingGroupLayer", + "name": "子图层-2", "styles": [ ], "transform": { "offset": { - "x": 100, - "y": 0 + "x": 1, + "y": 986 }, - "rotation": 45, + "rotation": 0, + "scale": { + "x": 1, + "y": 1 + } + } + }, + { + "element": 1, + "is-folder": false, + "name": "子图层-3", + "styles": [ + ], + "transform": { + "offset": { + "x": -959, + "y": -5 + }, + "rotation": 0, + "scale": { + "x": 1, + "y": 1 + } + } + }, + { + "element": 1, + "is-folder": false, + "name": "子图层-4", + "styles": [ + ], + "transform": { + "offset": { + "x": -958, + "y": 980 + }, + "rotation": 0, + "scale": { + "x": 1, + "y": 1 + } + } + }, + { + "element": 3, + "is-folder": false, + "name": "子图层-5", + "styles": [ + { + "material": "AH8A/wBanv8=", + "type": "fill" + } + ], + "transform": { + "offset": { + "x": 473, + "y": 419 + }, + "rotation": 0, "scale": { "x": 1, "y": 1 diff --git a/元素改变导致结构性变化是否安全的证明.md b/元素改变导致结构性变化是否安全的证明.md new file mode 100644 index 0000000..e51b861 --- /dev/null +++ b/元素改变导致结构性变化是否安全的证明.md @@ -0,0 +1,60 @@ +# 图层删除 +当删除一个节点时，该节点一定满足且只满足以下条件中的一条： +1. 是一个Leaf节点，引用了其他的Element； +2. 是一个Folder节点，没有GroupElement引用，没有引用任何其他节点（因为是Folder）； +3. 是一个Folder节点，存在对应的GroupElement引用。 + +其中，对于第1条，由于Leaf节点被删除只影响其父亲Folder的属性，所以显然在删除Leaf节点时是绝对安全的。 + +对于第2条，对于其父亲Folder，其被删除只影响其父亲Folder的属性，所以不会影响其父亲；对于其孩子，有可能存在以下情况： +1. 孩子中不存在任何被引用的情况：删除安全； +2. 孩子中存在Folder节点被GroupElement引用，不安全，需要手动将情况转换为第1条后才可以删除。 + +对于第3条，必须首先手动解除其本身的引用，然后将转变为第2条。 + +# 图元删除 +**显然**，无论是什么种类的图元，删除一个图元会影响到的元素只有引用它的图层，所以我们将SimpleElement与GroupElement合并成一种情况讨论。 + +当删除一个图元时，该图元一定满足且只满足以下条件中的一条： +1. 是一个GraphicElement，未被其他图层引用； +2. 是一个GraphicElement，被其他图层引用。 + +对于第1条，删除绝对安全。 + +对于第2条，将引用关系手动解除后，删除安全。 + +# 图层移动 +## 条件分析 +图层移动时，显然，被移动的节点只影响它本身及它的子图层， +移动的目标节点只影响它本身及它的父图层，那么： + +(1) 被移动的图层一定满足且只满足以下条件中的一条： +1. 是一个Folder节点，无对应的GroupElement引用，子节点无引用GroupElement； +2. 是一个Folder节点，无对应的GroupElement引用，子节点存在引用GroupElement； +3. 是一个Folder节点，存在对应的GroupElement引用； +4. 是一个Leaf节点，引用了GroupElement； +5. 是一个Leaf节点，未引用GroupElement。 + +(2) 目标FolderLayer一定满足且只满足以下条件中的一条： +1. 自身无对应的GroupElement引用，无父节点有GroupElement引用； +2. 自身无对应的GroupElement引用，存在父节点有GroupElement引用； +3. 自身存在对应的GroupElement引用。 + +显然，以上条件的全组合可以覆盖所有情况。 +由于： +- `(1) 1` 与 `(2) 中的任一条件`进行组合显然是绝对安全的； +- `(1) 3` 中自身提供的GroupElement并不会影响移动； +- `(1) 5` 与 `(2) 中的任一条件`进行组合显然是绝对安全的； +- `(1) 中的任一条件` 与 `(2) 1` 进行组合显然是绝对安全的。 + +所以接下来对于除去以上情况的所有组合情况进行讨论。 +## 讨论证明 +### `(1) 2` - `(2) 2` +当且仅当被移动的图层的子节点引用的GroupElement 与 目标图层父节点提供的GroupElement 相同时，移动不安全。 +### `(1) 4` - `(2) 2` +当且仅当被移动的图层引用的GroupElement 与 目标图层父节点提供的 GroupElement 相同时，移动不安全。 +### `(2) 3` 的特殊讨论 +当且仅当自身提供的GroupElement 被 被移动图层或其子节点引用时，需要处理其自身情况，否则无视其自身提供的GroupElement，与 `(2) 1` 或 `(2) 2` 视为同情况处理。 + +## 结论 +当且仅当被移动的图层或其子节点所引用的GroupElement 与 目标图层或其父节点所提供的GroupElement 相同时，移动不安全；其余情况均安全。 \ No newline at end of file