fixed a rendering issue with some named symbols inside a math environ…

…ment (reported in #3)

lib/jkqtmathtext/jkqtmathtext.cpp

@@ -2809,7 +2809,7 @@ double JKQTmathText::MTsymbolNode::draw(QPainter& painter, double x, double y, J
     painter.setFont(f);
 
     if (extendWidthInMathmode && currentEv.insideMath) {
-        x=x+0.5*width*parent->get_mathoperator_width_factor();
+        x=x+0.5*width*(parent->get_mathoperator_width_factor()-1.0);
     }
 
     //std::cout<<"symbol '"<<symbolName.toStdString()<<"' = "<<std::hex<<symbol.at(0).digitValue()<<" in font '"<<f.family().toStdString()<<"' ("<<QFontInfo(f).family().toStdString()<<"): "<<fm.inFont(symbol.at(0))<<std::endl;

test/jkqtmathtext_test/testform.cpp

@@ -8,6 +8,16 @@ TestForm::TestForm(QWidget *parent) :
     ui(new Ui::TestForm)
 {
     ui->setupUi(this);
+    ui->cmbTestset->addItem("simple equarelationslities", "$a{\\leq}b$, $a{\\geq}b$, $a{\\equiv}b$, $a=b$, $a{\\neq}b$, $a<b$, $a>b$");
+    ui->cmbTestset->addItem("named symbols 1", "ll: $\\ll$\\ gg: $\\gg$\\ leq: $\\leq$\\ geq: $\\geq$\\ pm: $\\pm$\\ mp: $\\mp$\\ ");
+    ui->cmbTestset->addItem("named symbols 2", "nexists: $\\nexists$\\ ni: $\\ni$\\ notni: $\\notni$\\ circ: $\\circ$\\ sim: $\\sim$\\ emptyset: $\\emptyset$\\ odot: $\\odot$\\ ominus: $\\ominus$\\ subsetnot: $\\subsetnot$\\ bot: $\\bot$");
+    ui->cmbTestset->addItem("named symbols 3", "leftharpoonup: $\\leftharpoonup$\\ rightharpoonup: $\\rightharpoonup$\\ upharpoonleft: $\\upharpoonleft$\\ downharpoonleft: $\\downharpoonleft$\\ leftrightharpoon: $\\leftrightharpoon$\\ rightleftharpoon: $\\rightleftharpoon$");
+    ui->cmbTestset->addItem("named symbols 4", "coprod: $\\coprod$\\ leftharpoondown: $\\leftharpoondown$\\ rightharpoondown: $\\rightharpoondown$\\ upharpoonright: $\\upharpoonright$\\ downharpoonright: $\\downharpoonright$\\ nwarrow: $\\nwarrow$\\ nearrow: $\\nearrow$\\ ");
+    ui->cmbTestset->addItem("named symbols 5", "searrow: $\\searrow$\\ swarrow: $\\swarrow$\\ mapsto: $\\mapsto$\\ div: $\\div$\\ multimap: $\\multimap$\\ maporiginal: $\\maporiginal$\\ mapimage: $\\mapimage$\\ ");
+    ui->cmbTestset->addItem("named symbols 6", "times: $\\times$\\ propto: $\\propto$\\ bullet: $\\bullet$\\ neq: $\\neq$\\ ne: $\\ne$\\ equiv: $\\equiv$\\ approx: $\\approx$\\ otimes: $\\otimes$\\ oplus: $\\oplus$");
+    ui->cmbTestset->addItem("named symbols 7", "oslash: $\\oslash$\\ cap: $\\cap$\\ land: $\\land$\\ cup: $\\cup$\\ lor: $\\lor$\\ supset: $\\supset$\\ supseteq: $\\supseteq$\\ supsetnot: $\\supsetnot$\\ subset: $\\subset$");
+    ui->cmbTestset->addItem("named symbols 8", "subseteq: $\\subseteq$\\ in: $\\in$\\ notin: $\\notin$\\ cdot: $\\cdot$\\ wedge: $\\wedge$\\ vee: $\\vee$\\ cong: $\\cong$\\ bot: $\\bot$");
+    ui->cmbTestset->addItem("symbols", "$\\ll\\gg\\leq\\geq\\leftrightarrow\\leftarrow\\rightarrow\\to\\uparrow\\downarrow\\updownarrow\\Leftrightarrow\\iff\\Leftarrow\\Rightarrow\\Uparrow\\Downarrow\\Updownarrow\\pm\\mp\\nexists\\ni\\notni\\circ\\sim\\emptyset\\odot\\ominus\\subsetnot\\bot\\leftharpoonup\\rightharpoonup\\upharpoonleft\\downharpoonleft\\leftrightharpoon\\rightleftharpoon\\coprod\\leftharpoondown\\rightharpoondown\\upharpoonright\\downharpoonright\\nwarrow\\nearrow\\searrow\\swarrow\\mapsto\\div\\multimap\\maporiginal\\mapimage\\times\\propto\\bullet\\neq\\ne\\equiv\\approx\\otimes\\oplus\\oslash\\cap\\land\\cup\\lor\\supset\\supseteq\\supsetnot\\subset\\subseteq\\in\\notin\\cdot\\wedge\\vee\\cong\\bot$");
     ui->cmbTestset->addItem("std dev", "$\\sigma_x=\\sqrt{\\langle (x-\\langle x\\rangle)^2\\rangle}=\\sqrt{\\frac{1}{N-1}\\cdot\\left( \\sum_{i=1}^N{x_i}^2-\\frac{1}{N}\\cdot\\left(\\sum_{i=1}^Nx_i\\right)^2\\right)}$");
     ui->cmbTestset->addItem("std dev 2", "$\\sigma_x=\\sqrt{\\langle (x-\\langle x\\rangle)^2\\rangle}=\\sqrt{\\frac{1}{N-1}\\cdot\\left( \\sum_{i=1}^Nx_i^2-\\frac{1}{N}\\cdot\\left(\\sum_{i=1}^Nx_i\\right)^2\\right)}$");
     ui->cmbTestset->addItem("rotation matrix", "$\\mathrm{\\mathbf{M}}(\\alpha) = \\left(\\begin{matrix}\\cos(\\alpha)+n_x^2\\cdot (1-\\cos(\\alpha))  &  n_x\\cdot n_y\\cdot (1-\\cos(\\alpha))-n_z\\cdot \\sin(\\alpha) &  n_x\\cdot n_z\\cdot (1-\\cos(\\alpha))+n_y\\cdot \\sin(\\alpha)\\\\n_x\\cdot n_y\\cdot (1-\\cos(\\alpha))+n_z\\cdot \\sin(\\alpha) & \\cos(\\alpha)+n_y^2\\cdot (1-\\cos(\\alpha))  &   n_y\\cdot n_z\\cdot (1-\\cos(\\alpha))-n_x\\cdot \\sin(\\alpha)\\\\n_z\\cdot n_x\\cdot (1-\\cos(\\alpha))-n_y\\cdot \\sin(\\alpha) & n_z\\cdot n_y\\cdot (1-\\cos(\\alpha))+n_x\\cdot \\sin(\\alpha)  & \\cos(\\alpha)+n_z^2\\cdot (1-\\cos(\\alpha))\\end{matrix}\\right)$");