JKQTMathText: improve documentation (fixes issue #74), add new draw()-variant, which accepts a QPointF

examples/jkqtmathtext_test/testform.cpp

@@ -251,11 +251,11 @@ TestForm::TestForm(QWidget *parent) :
     ui->cmbFont->setCurrentIndex(1);
 
     connect(ui->chkBoxes, SIGNAL(toggled(bool)), this, SLOT(updateMath()));
+    connect(ui->chkBigBox, SIGNAL(toggled(bool)), this, SLOT(updateMath()));
     connect(ui->chkAntiAlias, SIGNAL(toggled(bool)), this, SLOT(updateMath()));
-    connect(ui->chkAntiAliasHQ, SIGNAL(toggled(bool)), this, SLOT(updateMath()));
     connect(ui->chkAntiAliasText, SIGNAL(toggled(bool)), this, SLOT(updateMath()));
-    connect(ui->chkSmoothTransform, SIGNAL(toggled(bool)), this, SLOT(updateMath()));
     connect(ui->chkSimulateBlackboard, SIGNAL(toggled(bool)), this, SLOT(updateMath()));
+    connect(ui->cmbLastAlign, SIGNAL(currentIndexChanged(int)), this, SLOT(updateMath()));
     connect(ui->cmbFont, SIGNAL(currentIndexChanged(int)), this, SLOT(updateMath()));
     connect(ui->cmbScript, SIGNAL(currentIndexChanged(int)), this, SLOT(updateMath()));
     connect(ui->cmbTestset, SIGNAL(currentIndexChanged(int)), this, SLOT(updateMath()));
@@ -309,15 +309,17 @@ double TestForm::draw(QPainter& painter, double X, double YY, JKQTMathText& mt,
     durationSizingMS=ht.getTime()/1000.0;
     qDebug()<<"    sizing in "<<durationSizingMS<<" ms\n";
     QPen p=painter.pen();
-    p.setColor("lightcoral");
+    if (ui->chkBigBox->isChecked()) {
-    p.setStyle(Qt::DashLine);
+        p.setColor("lightcoral");
-    p.setWidth(2);
+        p.setStyle(Qt::DashLine);
-    painter.setPen(p);
+        p.setWidth(2);
-    QRectF r(X, Y-mt.getAscent(painter),s.width(), s.height());
+        painter.setPen(p);
-    painter.drawRect(r);
+        QRectF r(X, Y-mt.getAscent(painter),s.width(), s.height());
-    p.setColor("lightblue");
+        painter.drawRect(r);
-    painter.setPen(p);
+        p.setColor("lightblue");
-    painter.drawLine(X, Y, X+s.width(), Y);
+        painter.setPen(p);
+        painter.drawLine(X, Y, X+s.width(), Y);
+    }
     ht.start();
     p.setStyle(Qt::SolidLine);
     p.setWidth(1);
@@ -341,6 +343,52 @@ double TestForm::draw(QPainter& painter, double X, double YY, JKQTMathText& mt,
     return mt.getDescent(painter)+mt.getAscent(painter)+40;
 }
 
+double TestForm::drawAligned(QPainter& painter, double X, double YY, JKQTMathText& mt, QString name) {
+
+
+    double Y=YY;
+    painter.save();
+    ht.start();
+    const QSizeF s=mt.getSize(painter);
+    const QRectF rect(X, Y, s.width()+32, s.height()+32);
+    int flags=Qt::AlignLeft|Qt::AlignTop;
+    switch(ui->cmbLastAlign->currentIndex()) {
+    case 0: flags=Qt::AlignLeft|Qt::AlignTop; break;
+    case 1: flags=Qt::AlignLeft|Qt::AlignVCenter; break;
+    case 2: flags=Qt::AlignLeft|Qt::AlignBottom; break;
+    case 3: flags=Qt::AlignHCenter|Qt::AlignTop; break;
+    case 4: flags=Qt::AlignHCenter|Qt::AlignVCenter; break;
+    case 5: flags=Qt::AlignHCenter|Qt::AlignBottom; break;
+    case 6: flags=Qt::AlignRight|Qt::AlignTop; break;
+    case 7: flags=Qt::AlignRight|Qt::AlignVCenter; break;
+    case 8: flags=Qt::AlignRight|Qt::AlignBottom; break;
+    }
+
+    QPen p=painter.pen();
+    p.setColor("darkred");
+    p.setStyle(Qt::SolidLine);
+    p.setWidth(2);
+    painter.setPen(p);
+    painter.drawRect(rect);
+    p.setStyle(Qt::SolidLine);
+    p.setWidth(1);
+    p.setColor("black");
+    painter.setPen(p);
+    mt.draw(painter, flags, rect, ui->chkBoxes->isChecked());
+    p.setColor("blue");
+    painter.setPen(p);
+
+    QFont f;
+    f.setFamily("sans serif");
+    f.setUnderline(true);
+    f.setPointSize(10);
+    painter.setFont(f);
+    painter.drawText(X, Y-6, name+":");
+    painter.restore();
+    qDebug()<<name<<":  width="<<s.width()<<"  height="<<s.height()<<"  ascent="<<mt.getAscent(painter)<<"  descent="<<mt.getDescent(painter);
+    return rect.bottom()+40;
+}
+
 QTreeWidgetItem *TestForm::createTree(JKQTMathTextNode *node, QTreeWidgetItem* parent)
 {
     QString name;
@@ -469,11 +517,7 @@ void TestForm::updateMath()
 
     painter.begin(&pix);
     if (ui->chkAntiAlias->isChecked()) painter.setRenderHint(QPainter::Antialiasing);
-#if (QT_VERSION<QT_VERSION_CHECK(6, 0, 0))
-    if (ui->chkAntiAliasHQ->isChecked()) painter.setRenderHint(QPainter::HighQualityAntialiasing);
-#endif
     if (ui->chkAntiAliasText->isChecked()) painter.setRenderHint(QPainter::TextAntialiasing);
-    if (ui->chkSmoothTransform->isChecked()) painter.setRenderHint(QPainter::QPainter::SmoothPixmapTransform);
     ht.start();
 
 
@@ -525,7 +569,7 @@ void TestForm::updateMath()
     QStringList sl=ui->edtSizes->text().split(",");
     ui->labRenderTimes->setText("");
 
-    for (int i=0; i<sl.size(); i++) {
+    for (int i=0; i<sl.size()-1; i++) {
         bool ok=true;
         int size=sl[i].trimmed().toUInt(&ok);
         if (!ok) size=10+i*5;
@@ -552,6 +596,14 @@ void TestForm::updateMath()
         }
     }
 
+    if (sl.size()>0) {
+        bool ok=true;
+        int size=sl.last().trimmed().toUInt(&ok);
+        if (!ok) size=font().pointSizeF();
+        mt.setFontSize(size);
+        Y+=drawAligned(painter, X1, Y, mt, QString("%1, %2pt, align: %3").arg(ui->cmbTestset->currentText()).arg(size).arg(ui->cmbLastAlign->currentText()));
+    }
+
     painter.end();
 
 

examples/jkqtmathtext_test/testform.h

@@ -28,6 +28,7 @@ class TestForm : public QWidget
         Ui::TestForm *ui;
         JKQTPHighResTimer ht;
         double draw(QPainter& painter, double X, double YY, JKQTMathText& mt, QString name, double &durationSizingMS, double &durationTimingMS, QStringList *lstErrors=nullptr);
+        double drawAligned(QPainter& painter, double X, double YY, JKQTMathText& mt, QString name);
 
         QTreeWidgetItem* createTree(JKQTMathTextNode* node, QTreeWidgetItem *parent=NULL);
 };

examples/jkqtmathtext_test/testform.ui

@@ -588,7 +588,7 @@
     </widget>
    </item>
    <item row="0" column="0" colspan="2">
-    <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,2,0,2,0,0,1,0,0,0,0,0">
+    <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,2,0,2,0,0,1,0,0,0,0,0,0">
      <item>
       <widget class="QLabel" name="label_3">
        <property name="text">
@@ -685,7 +685,7 @@
      <item>
       <widget class="QLineEdit" name="edtSizes">
        <property name="text">
-        <string>90,30,20,10</string>
+        <string>90,30,20,10,12</string>
        </property>
       </widget>
      </item>
@@ -699,6 +699,16 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QCheckBox" name="chkBigBox">
+       <property name="text">
+        <string>big-box</string>
+       </property>
+       <property name="checked">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
      <item>
       <widget class="QCheckBox" name="chkAntiAlias">
        <property name="text">
@@ -709,13 +719,6 @@
        </property>
       </widget>
      </item>
-     <item>
-      <widget class="QCheckBox" name="chkAntiAliasHQ">
-       <property name="text">
-        <string>HQ anti-aliase</string>
-       </property>
-      </widget>
-     </item>
      <item>
       <widget class="QCheckBox" name="chkAntiAliasText">
        <property name="text">
@@ -726,13 +729,6 @@
        </property>
       </widget>
      </item>
-     <item>
-      <widget class="QCheckBox" name="chkSmoothTransform">
-       <property name="text">
-        <string>smooth transform</string>
-       </property>
-      </widget>
-     </item>
      <item>
       <spacer name="horizontalSpacer">
        <property name="orientation">
@@ -746,6 +742,62 @@
        </property>
       </spacer>
      </item>
+     <item>
+      <widget class="QLabel" name="label_5">
+       <property name="text">
+        <string>last-align</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="cmbLastAlign">
+       <item>
+        <property name="text">
+         <string>lt</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>lc</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>lb</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>ct</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>cc</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>cb</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>rt</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>rc</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>rb</string>
+        </property>
+       </item>
+      </widget>
+     </item>
     </layout>
    </item>
    <item row="9" column="1">

lib/jkqtmathtext/jkqtmathtext.cpp

@@ -1648,6 +1648,11 @@ void JKQTMathText::getSizeDetail(QPainter& painter, double& width, double& ascen
     }
 }
 
+void JKQTMathText::draw(QPainter &painter, QPointF x, bool drawBoxes)
+{
+    draw(painter, x.x(), x.y(), drawBoxes);
+}
+
 void JKQTMathText::draw(QPainter& painter, double x, double y, bool drawBoxes){
     if (getNodeTree()!=nullptr) {
         JKQTMathTextEnvironment ev;

lib/jkqtmathtext/jkqtmathtext.h

@@ -253,11 +253,36 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
         double getAscent(QPainter& painter);
         /** \brief return the detailes sizes of the text */
         void getSizeDetail(QPainter& painter, double& width, double& ascent, double& descent, double& strikeoutPos);
-        /** \brief draw a representation to the <a href="http://doc.qt.io/qt-5/qpainter.html">QPainter</a> object at the specified position */
+        /** \brief draw a representation to the  object at the specified position \a x , \a y
-        void draw(QPainter& painter, double x, double y, bool drawBoxes=false);
-        /** \brief overloaded version of draw(QPainter& painter, double x, double y).
          *
-         *  This version draws the text inside the given rectangle according to the specified flags.
+         *  \param painter the <a href="http://doc.qt.io/qt-5/qpainter.html">QPainter</a> to use for drawing
+         *  \param x position of the left border of the text/expression to be drawn (see sketch below)
+         *  \param drawBoxes if \c true boxes defining the size of each node are drawn, example output: \image html jkqtmathtext/jkqtmathtext_drawboxes.png
+         *
+         *  Here is an illustration of the geometry of the drawn text/expression:
+         *  \image html jkqtmathtext/jkqtmathtext_node_geo.png
+         */
+        void draw(QPainter& painter, QPointF x, bool drawBoxes=false);
+        /** \brief draw a representation to the  object at the specified position \a x , \a y
+         *
+         *  \param painter the <a href="http://doc.qt.io/qt-5/qpainter.html">QPainter</a> to use for drawing
+         *  \param x x-position of the left border of the text/expression to be drawn (see sketch below)
+         *  \param y y-position of the baseline of the text/expression to be drawn (see sketch below)
+         *  \param drawBoxes if \c true boxes defining the size of each node are drawn, example output: \image html jkqtmathtext/jkqtmathtext_drawboxes.png
+         *
+         *  Here is an illustration of the geometry of the drawn text/expression:
+         *  \image html jkqtmathtext/jkqtmathtext_node_geo.png
+         */
+        void draw(QPainter& painter, double x, double y, bool drawBoxes=false);
+        /** \brief draw into a rectangle \a rect with alignment defined in \a flags (see below)
+         *
+         *  \param painter the <a href="http://doc.qt.io/qt-5/qpainter.html">QPainter</a> to use for drawing
+         *  \param rect rectangle to draw the text/expression into (see sketch below)
+         *  \param flags alignment within \a rect (see below), use e.g. \c Qt::AlignHCenter|Qt::AlignVCenter to center the expression inside \a rect
+         *  \param drawBoxes if \c true boxes defining the size of each node are drawn, example output: \image html jkqtmathtext/jkqtmathtext_drawboxes.png
+         *
+         *  These options are interpreted for \a flags (dark-red is the rectangle \a rect):
+         *  \image html jkqtmathtext/jkqtmathtext_draw_flags.png
          */
         void draw(QPainter& painter, unsigned int flags, QRectF rect, bool drawBoxes=false);