New feature: rotating pages in viewer

PdfForQtLib/sources/pdfdrawspacecontroller.cpp

@@ -37,6 +37,7 @@ PDFDrawSpaceController::PDFDrawSpaceController(QObject* parent) :
     m_pageLayoutMode(PageLayout::OneColumn),
     m_verticalSpacingMM(5.0),
     m_horizontalSpacingMM(1.0),
+    m_pageRotation(PageRotation::None),
     m_fontCache(DEFAULT_FONT_CACHE_LIMIT, DEFAULT_REALIZED_FONT_CACHE_LIMIT)
 {
 
@@ -137,6 +138,15 @@ QSizeF PDFDrawSpaceController::getReferenceBoundingBox() const
     return rect.size();
 }
 
+void PDFDrawSpaceController::setPageRotation(PageRotation pageRotation)
+{
+    if (m_pageRotation != pageRotation)
+    {
+        m_pageRotation = pageRotation;
+        recalculate();
+    }
+}
+
 void PDFDrawSpaceController::recalculate()
 {
     if (!m_document)
@@ -148,19 +158,6 @@ void PDFDrawSpaceController::recalculate()
     const PDFCatalog* catalog = m_document->getCatalog();
     size_t pageCount = catalog->getPageCount();
 
-    // First, preserve page rotations. We assume the count of pages is the same as the document.
-    // Document should not be changed while viewing. If a new document is setted, then the draw
-    // space is cleared first.
-    std::vector<PageRotation> pageRotation(pageCount, PageRotation::None);
-    for (size_t i = 0; i < pageCount; ++i)
-    {
-        pageRotation[i] = catalog->getPage(i)->getPageRotation();
-    }
-    for (const LayoutItem& layoutItem : m_layoutItems)
-    {
-        pageRotation[layoutItem.pageIndex] = layoutItem.pageRotation;
-    }
-
     // Clear the old draw space
     clear(false);
 
@@ -168,26 +165,26 @@ void PDFDrawSpaceController::recalculate()
 
     // Places the pages on the left/right sides. Pages can be nullptr, but not both of them.
     // Updates bounding rectangle.
-    auto placePagesLeftRight = [this, catalog, &pageRotation](PDFInteger blockIndex, size_t leftIndex, size_t rightIndex, PDFReal& yPos, QRectF& boundingRect)
+    auto placePagesLeftRight = [this, catalog](PDFInteger blockIndex, size_t leftIndex, size_t rightIndex, PDFReal& yPos, QRectF& boundingRect)
     {
         PDFReal yPosAdvance = 0.0;
 
         if (leftIndex != INVALID_PAGE_INDEX)
         {
-            QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(leftIndex)->getMediaBoxMM(), pageRotation[leftIndex]).size();
+            QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(leftIndex)->getRotatedMediaBoxMM(), m_pageRotation).size();
             PDFReal xPos = -pageSize.width() - m_horizontalSpacingMM * 0.5;
             QRectF rect(xPos, yPos, pageSize.width(), pageSize.height());
-            m_layoutItems.emplace_back(blockIndex, leftIndex, pageRotation[leftIndex], rect);
+            m_layoutItems.emplace_back(blockIndex, leftIndex, rect);
             yPosAdvance = qMax(yPosAdvance, pageSize.height());
             boundingRect = boundingRect.united(rect);
         }
 
         if (rightIndex != INVALID_PAGE_INDEX)
         {
-            QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(rightIndex)->getMediaBoxMM(), pageRotation[rightIndex]).size();
+            QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(rightIndex)->getRotatedMediaBoxMM(), m_pageRotation).size();
             PDFReal xPos = m_horizontalSpacingMM * 0.5;
             QRectF rect(xPos, yPos, pageSize.width(), pageSize.height());
-            m_layoutItems.emplace_back(blockIndex, rightIndex, pageRotation[rightIndex], rect);
+            m_layoutItems.emplace_back(blockIndex, rightIndex, rect);
             yPosAdvance = qMax(yPosAdvance, pageSize.height());
             boundingRect = boundingRect.united(rect);
         }
@@ -247,9 +244,9 @@ void PDFDrawSpaceController::recalculate()
 
             for (size_t i = 0; i < pageCount; ++i)
             {
-                QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(i)->getMediaBoxMM(), pageRotation[i]).size();
+                QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(i)->getRotatedMediaBoxMM(), m_pageRotation).size();
                 QRectF rect(-pageSize.width() * 0.5, -pageSize.height() * 0.5, pageSize.width(), pageSize.height());
-                m_layoutItems.emplace_back(i, i, pageRotation[i], rect);
+                m_layoutItems.emplace_back(i, i, rect);
                 m_blockItems.emplace_back(rect);
             }
 
@@ -268,9 +265,9 @@ void PDFDrawSpaceController::recalculate()
             for (size_t i = 0; i < pageCount; ++i)
             {
                 // Top of current page is at yPos.
-                QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(i)->getMediaBoxMM(), pageRotation[i]).size();
+                QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(i)->getRotatedMediaBoxMM(), m_pageRotation).size();
                 QRectF rect(-pageSize.width() * 0.5, yPos, pageSize.width(), pageSize.height());
-                m_layoutItems.emplace_back(0, i, pageRotation[i], rect);
+                m_layoutItems.emplace_back(0, i, rect);
                 yPos += pageSize.height() + m_verticalSpacingMM;
                 boundingRectangle = boundingRectangle.united(rect);
             }
@@ -491,7 +488,7 @@ void PDFDrawWidgetProxy::update()
         m_layout.items.reserve(items.size());
         for (const PDFDrawSpaceController::LayoutItem& item : items)
         {
-            m_layout.items.emplace_back(item.pageIndex, item.pageRotation, fromDeviceSpace(item.pageRectMM).toRect());
+            m_layout.items.emplace_back(item.pageIndex, fromDeviceSpace(item.pageRectMM).toRect());
         }
 
         m_layout.blockRect = fromDeviceSpace(rectangle).toRect();
@@ -594,6 +591,59 @@ void PDFDrawWidgetProxy::update()
     emit drawSpaceChanged();
 }
 
+QMatrix PDFDrawWidgetProxy::createPagePointToDevicePointMatrix(const PDFPage* page, const QRectF& rectangle) const
+{
+    QMatrix matrix;
+
+    // We want to create transformation from unrotated rectangle
+    // to rotated page rectangle.
+
+    QRectF unrotatedRectangle = rectangle;
+    switch (m_controller->getPageRotation())
+    {
+        case PageRotation::None:
+            break;
+
+        case PageRotation::Rotate180:
+        {
+            matrix.translate(0, rectangle.top() + rectangle.bottom());
+            matrix.scale(1.0, -1.0);
+            Q_ASSERT(qFuzzyCompare(matrix.map(rectangle.topLeft()).y(), rectangle.bottom()));
+            Q_ASSERT(qFuzzyCompare(matrix.map(rectangle.bottomLeft()).y(), rectangle.top()));
+            break;
+        }
+
+        case PageRotation::Rotate90:
+        {
+            unrotatedRectangle = rectangle.transposed();
+            matrix.translate(rectangle.left(), rectangle.top());
+            matrix.rotate(90);
+            matrix.translate(-rectangle.left(), -rectangle.top());
+            matrix.translate(0, -unrotatedRectangle.height());
+            break;
+        }
+
+        case PageRotation::Rotate270:
+        {
+            unrotatedRectangle = rectangle.transposed();
+            matrix.translate(rectangle.left(), rectangle.top());
+            matrix.rotate(90);
+            matrix.translate(-rectangle.left(), -rectangle.top());
+            matrix.translate(0, -unrotatedRectangle.height());
+            matrix.translate(0.0, unrotatedRectangle.top() + unrotatedRectangle.bottom());
+            matrix.scale(1.0, -1.0);
+            matrix.translate(unrotatedRectangle.left() + unrotatedRectangle.right(), 0.0);
+            matrix.scale(-1.0, 1.0);
+            break;
+        }
+
+        default:
+            break;
+    }
+
+    return PDFRenderer::createPagePointToDevicePointMatrix(page, unrotatedRectangle) * matrix;
+}
+
 void PDFDrawWidgetProxy::draw(QPainter* painter, QRect rect)
 {
     painter->fillRect(rect, Qt::lightGray);
@@ -624,7 +674,7 @@ void PDFDrawWidgetProxy::draw(QPainter* painter, QRect rect)
                 timer.start();
 
                 const PDFPage* page = m_controller->getDocument()->getCatalog()->getPage(item.pageIndex);
-                QMatrix matrix = PDFRenderer::createPagePointToDevicePointMatrix(page, placedRect);
+                QMatrix matrix = createPagePointToDevicePointMatrix(page, placedRect);
                 compiledPage->draw(painter, page->getCropBox(), matrix, m_features);
                 PDFTextLayoutGetter layoutGetter = m_textLayoutCompiler->getTextLayoutLazy(item.pageIndex);
 
@@ -802,7 +852,7 @@ PDFInteger PDFDrawWidgetProxy::getPageUnderPoint(QPoint point, QPointF* pagePoin
             if (pagePoint)
             {
                 const PDFPage* page = m_controller->getDocument()->getCatalog()->getPage(item.pageIndex);
-                QMatrix matrix = PDFRenderer::createPagePointToDevicePointMatrix(page, placedRect).inverted();
+                QMatrix matrix = createPagePointToDevicePointMatrix(page, placedRect).inverted();
                 *pagePoint = matrix.map(point);
             }
 
@@ -921,6 +971,18 @@ void PDFDrawWidgetProxy::performOperation(Operation operation)
             break;
         }
 
+        case RotateRight:
+        {
+            m_controller->setPageRotation(getPageRotationRotatedRight(m_controller->getPageRotation()));
+            break;
+        }
+
+        case RotateLeft:
+        {
+            m_controller->setPageRotation(getPageRotationRotatedLeft(m_controller->getPageRotation()));
+            break;
+        }
+
         default:
         {
             Q_ASSERT(false);

PdfForQtLib/sources/pdfdrawspacecontroller.h

@@ -97,15 +97,14 @@ public:
     /// page and page rectangle, in which the page is contained.
     struct LayoutItem
     {
-        constexpr inline explicit LayoutItem() : blockIndex(-1), pageIndex(-1), pageRotation(PageRotation::None) { }
+        constexpr inline explicit LayoutItem() : blockIndex(-1), pageIndex(-1) { }
-        constexpr inline explicit LayoutItem(PDFInteger blockIndex, PDFInteger pageIndex, PageRotation rotation, const QRectF& pageRectMM) :
+        constexpr inline explicit LayoutItem(PDFInteger blockIndex, PDFInteger pageIndex, const QRectF& pageRectMM) :
-            blockIndex(blockIndex), pageIndex(pageIndex), pageRotation(rotation), pageRectMM(pageRectMM) { }
+            blockIndex(blockIndex), pageIndex(pageIndex), pageRectMM(pageRectMM) { }
 
         bool isValid() const { return pageIndex != -1; }
 
         PDFInteger blockIndex;
         PDFInteger pageIndex;
-        PageRotation pageRotation;
         QRectF pageRectMM;
     };
 
@@ -138,6 +137,12 @@ public:
     /// any page on the screen will fit this bounding box, regardless of mode (single/two columns, etc.).
     QSizeF getReferenceBoundingBox() const;
 
+    /// Returns page rotation
+    PageRotation getPageRotation() const { return m_pageRotation; }
+
+    /// Sets page rotation
+    void setPageRotation(PageRotation pageRotation);
+
 signals:
     void drawSpaceChanged();
     void repaintNeeded();
@@ -169,6 +174,7 @@ private:
     BlockItems m_blockItems;
     PDFReal m_verticalSpacingMM;
     PDFReal m_horizontalSpacingMM;
+    PageRotation m_pageRotation;
 
     /// Font cache
     PDFFontCache m_fontCache;
@@ -196,6 +202,12 @@ public:
     /// Updates the draw space area
     void update();
 
+    /// Creates page point to device point matrix for the given rectangle. It creates transformation
+    /// from page's media box to the target rectangle.
+    /// \param page Page, for which we want to create matrix
+    /// \param rectangle Page rectangle, to which is page media box transformed
+    QMatrix createPagePointToDevicePointMatrix(const PDFPage* page, const QRectF& rectangle) const;
+
     /// Draws the actually visible pages on the painter using the rectangle.
     /// Rectangle is space in the widget, which is used for painting the PDF.
     /// \param painter Painter to paint the PDF pages
@@ -220,7 +232,9 @@ public:
         NavigateNextPage,
         NavigatePreviousPage,
         NavigateNextStep,
-        NavigatePreviousStep
+        NavigatePreviousStep,
+        RotateRight,
+        RotateLeft
     };
 
     /// Performs the desired operation (for example navigation).
@@ -329,13 +343,12 @@ signals:
 private:
     struct LayoutItem
     {
-        constexpr inline explicit LayoutItem() : pageIndex(-1), pageRotation(PageRotation::None) { }
+        constexpr inline explicit LayoutItem() : pageIndex(-1) { }
-        constexpr inline explicit LayoutItem(PDFInteger pageIndex, PageRotation rotation, const QRect& pageRect) :
+        constexpr inline explicit LayoutItem(PDFInteger pageIndex, const QRect& pageRect) :
-            pageIndex(pageIndex), pageRotation(rotation), pageRect(pageRect) { }
+            pageIndex(pageIndex), pageRect(pageRect) { }
 
 
         PDFInteger pageIndex;
-        PageRotation pageRotation;
         QRect pageRect;
     };
 

PdfForQtLib/sources/pdfpage.cpp

@@ -121,6 +121,11 @@ QRectF PDFPage::getRotatedMediaBox() const
     return getRotatedBox(getMediaBox(), getPageRotation());
 }
 
+QRectF PDFPage::getRotatedMediaBoxMM() const
+{
+    return getRotatedBox(getMediaBoxMM(), getPageRotation());
+}
+
 QRectF PDFPage::getRotatedCropBox() const
 {
     return getRotatedBox(getCropBox(), getPageRotation());

PdfForQtLib/sources/pdfpage.h

@@ -39,6 +39,40 @@ enum class PageRotation
     Rotate270
 };
 
+constexpr PageRotation getPageRotationRotatedRight(PageRotation rotation)
+{
+    switch (rotation)
+    {
+        case PageRotation::None:
+            return PageRotation::Rotate90;
+        case PageRotation::Rotate90:
+            return PageRotation::Rotate180;
+        case PageRotation::Rotate180:
+            return PageRotation::Rotate270;
+        case PageRotation::Rotate270:
+            return PageRotation::None;
+    }
+
+    return PageRotation::None;
+}
+
+constexpr PageRotation getPageRotationRotatedLeft(PageRotation rotation)
+{
+    switch (rotation)
+    {
+        case PageRotation::None:
+            return PageRotation::Rotate270;
+        case PageRotation::Rotate90:
+            return PageRotation::None;
+        case PageRotation::Rotate180:
+            return PageRotation::Rotate90;
+        case PageRotation::Rotate270:
+            return PageRotation::Rotate180;
+    }
+
+    return PageRotation::None;
+}
+
 /// This class represents attributes, which are inheritable. Also allows merging from
 /// parents.
 class PDFPageInheritableAttributes
@@ -97,6 +131,7 @@ public:
     inline PDFObjectReference getPageReference() const { return m_pageReference; }
 
     QRectF getRotatedMediaBox() const;
+    QRectF getRotatedMediaBoxMM() const;
     QRectF getRotatedCropBox() const;
 
     static QRectF getRotatedBox(const QRectF& rect, PageRotation rotation);

PdfForQtViewer/pdfforqtviewer.qrc

@@ -33,5 +33,7 @@
         <file>resources/find-previous.svg</file>
         <file>resources/select-text.svg</file>
         <file>resources/ui.svg</file>
+        <file>resources/rotate-left.svg</file>
+        <file>resources/rotate-right.svg</file>
     </qresource>
 </RCC>

PdfForQtViewer/pdfviewermainwindow.cpp

@@ -107,6 +107,8 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget* parent) :
     ui->actionSelectTextAll->setShortcut(QKeySequence::SelectAll);
     ui->actionDeselectText->setShortcut(QKeySequence::Deselect);
     ui->actionCopyText->setShortcut(QKeySequence::Copy);
+    ui->actionRotateRight->setShortcut(QKeySequence("Ctrl+Shift++"));
+    ui->actionRotateLeft->setShortcut(QKeySequence("Ctrl+Shift+-"));
 
     for (QAction* action : m_recentFileManager->getActions())
     {
@@ -1146,4 +1148,14 @@ void PDFViewerMainWindow::on_actionSend_by_E_Mail_triggered()
     }
 }
 
+void PDFViewerMainWindow::on_actionRotateRight_triggered()
+{
+    m_pdfWidget->getDrawWidgetProxy()->performOperation(pdf::PDFDrawWidgetProxy::RotateRight);
+}
+
+void PDFViewerMainWindow::on_actionRotateLeft_triggered()
+{
+    m_pdfWidget->getDrawWidgetProxy()->performOperation(pdf::PDFDrawWidgetProxy::RotateLeft);
+}
+
 }   // namespace pdfviewer

PdfForQtViewer/pdfviewermainwindow.h

@@ -92,6 +92,10 @@ private slots:
     void on_actionProperties_triggered();
     void on_actionSend_by_E_Mail_triggered();
 
+    void on_actionRotateRight_triggered();
+
+    void on_actionRotateLeft_triggered();
+
 private:
     void onActionOpenTriggered();
     void onActionCloseTriggered();

PdfForQtViewer/pdfviewermainwindow.ui

@@ -68,6 +68,9 @@
     <addaction name="menuPage_Layout"/>
     <addaction name="menuRendering_Options"/>
     <addaction name="separator"/>
+    <addaction name="actionRotateRight"/>
+    <addaction name="actionRotateLeft"/>
+    <addaction name="separator"/>
     <addaction name="actionZoom_In"/>
     <addaction name="actionZoom_Out"/>
     <addaction name="separator"/>
@@ -419,6 +422,24 @@
     <string>Invert Colors</string>
    </property>
   </action>
+  <action name="actionRotateRight">
+   <property name="icon">
+    <iconset resource="pdfforqtviewer.qrc">
+     <normaloff>:/resources/rotate-right.svg</normaloff>:/resources/rotate-right.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Rotate Right</string>
+   </property>
+  </action>
+  <action name="actionRotateLeft">
+   <property name="icon">
+    <iconset resource="pdfforqtviewer.qrc">
+     <normaloff>:/resources/rotate-left.svg</normaloff>:/resources/rotate-left.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Rotate Left</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <resources>

PdfForQtViewer/resources/rotate-left.svg

@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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+   height="30mm"
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+   version="1.1"
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+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
+   sodipodi:docname="rotate-left.svg">
+  <defs
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+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
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+        <dc:title></dc:title>
+        <dc:creator>
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+            <dc:title>Jakub Melka</dc:title>
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+           rdf:resource="http://creativecommons.org/ns#Attribution" />
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PdfForQtViewer/resources/rotate-right.svg

@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
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+   xmlns:svg="http://www.w3.org/2000/svg"
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+   viewBox="0 0 30 30"
+   version="1.1"
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+   sodipodi:docname="rotate-right.svg">
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+        <dc:title></dc:title>
+        <dc:creator>
+          <cc:Agent>
+            <dc:title>Jakub Melka</dc:title>
+          </cc:Agent>
+        </dc:creator>
+        <cc:license
+           rdf:resource="http://creativecommons.org/licenses/by-sa/4.0/" />
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