From 24526aa6a549fc77574be4e1941f741e9f5d8750 Mon Sep 17 00:00:00 2001
From: jkriege2 <jan@jkrieger.de>
Date: Fri, 9 Feb 2024 16:59:14 +0100
Subject: [PATCH] NEW: added JKQTPGLabelCenteredOnData to
 JKQTPGraphLabelPosition, so JKQTPXYGraphLabels can draw directly centered
 over the datapoint

---
 .gitignore                                      |   3 +++
 doc/CMakeLists.txt                              |   2 +-
 doc/images/JKQTPGLabelCenteredOnData.png        | Bin 0 -> 14616 bytes
 examples/graphlabels/graphlabels.cpp            |  12 ++++++++++++
 .../graphs/jkqtpgraphlabelstylemixin.cpp        |  10 +++++++++-
 .../graphs/jkqtpgraphlabelstylemixin.h          |   5 ++++-
 6 files changed, 29 insertions(+), 3 deletions(-)
 create mode 100644 doc/images/JKQTPGLabelCenteredOnData.png

diff --git a/.gitignore b/.gitignore
index 514a656667..b7779bff54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -178,3 +178,6 @@ Sicherungskopie_*
 /doc/images/JKQTPGLabelTowardsYAxis_small.png
 /doc/images/JKQTPGLSimpleBoxVertical_small.png
 /doc/images/JKQTPGLSimpleBox_small.png
+/doc/images/JKQTPGLabelCenteredOnDataVertical.png
+/doc/images/JKQTPGLabelCenteredOnDataVertical_small.png
+/doc/images/JKQTPGLabelCenteredOnData_small.png
diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index db2c5f4b27..581818fd9c 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -273,7 +273,7 @@ if(JKQtPlotter_BUILD_EXAMPLES)
         symbols_and_errors/JKQTPXYLineErrorGraph_JKQTPErrorBars,JKQTPXYLineErrorGraph_JKQTPErrorLines,JKQTPXYLineErrorGraph_JKQTPErrorPolygons/--iteratefunctorsteps--iteratefunctorsteps_suppressinitial--smallscreenshotplot
         boxplot/JKQTPBoxplotVerticalGraph,JKQTPBoxplotHorizontalGraph/--iteratefunctorsteps--iteratefunctorsteps_suppressinitial--smallscreenshotplot
         second_axis/JKQTBasePlotter_addSecondaryYAxis,JKQTBasePlotter_addSecondaryXAxis
-        graphlabels/JKQTPGLabelAwayFromXAxis,JKQTPGLabelAwayFromYAxis,JKQTPGLabelTowardsXAxis,JKQTPGLabelTowardsYAxis,JKQTPGLabelAboveData,JKQTPGLabelRightHandSide,JKQTPGLabelBelowData,JKQTPGLabelLeftHandSide,JKQTPGLSimpleBox,JKQTPGLSimpleBoxVertical,JKQTPGLSimpleBoxAndLine,JKQTPGLSimpleBoxAndLineVertical,JKQTPGLSimpleBoxAndLineONLYLABELS,JKQTPGLSimpleBoxAndLineONLYLABELSVertical/--iteratefunctorsteps--smallscreenshotplot
+        graphlabels/JKQTPGLabelAwayFromXAxis,JKQTPGLabelAwayFromYAxis,JKQTPGLabelTowardsXAxis,JKQTPGLabelTowardsYAxis,JKQTPGLabelAboveData,JKQTPGLabelRightHandSide,JKQTPGLabelBelowData,JKQTPGLabelLeftHandSide,JKQTPGLabelCenteredOnData,JKQTPGLabelCenteredOnDataVertical,JKQTPGLSimpleBox,JKQTPGLSimpleBoxVertical,JKQTPGLSimpleBoxAndLine,JKQTPGLSimpleBoxAndLineVertical,JKQTPGLSimpleBoxAndLineONLYLABELS,JKQTPGLSimpleBoxAndLineONLYLABELSVertical/--iteratefunctorsteps--smallscreenshotplot
         vectorfield/JKQTPVectorFieldGraph,JKQTPVectorFieldGraphAnchorBottom,JKQTPVectorFieldGraphAnchorMid,JKQTPVectorFieldGraphAnchorTip,JKQTPVectorFieldGraphAutoscaleLength,JKQTPVectorFieldGraphLengthFromData,JKQTPVectorFieldGraphIgnoreLength,JKQTPVectorFieldGraphIgnoreLengthAutoscaleLineWidthFromLength,JKQTPVectorFieldGraphAutoscaleLengthAutoscaleLineWidthFromLength/--iteratefunctorsteps
     )
 
diff --git a/doc/images/JKQTPGLabelCenteredOnData.png b/doc/images/JKQTPGLabelCenteredOnData.png
new file mode 100644
index 0000000000000000000000000000000000000000..39d4d5a53e112bef9cf362bb1ccfa99d73a05c6d
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HcmV?d00001

diff --git a/examples/graphlabels/graphlabels.cpp b/examples/graphlabels/graphlabels.cpp
index 623f7d7968..f052b427c3 100644
--- a/examples/graphlabels/graphlabels.cpp
+++ b/examples/graphlabels/graphlabels.cpp
@@ -110,7 +110,19 @@ int main(int argc, char* argv[])
         plotV.redrawPlot();
         plotH.redrawPlot();
     });
+
     app.addExportStepFunctor([&](){
+        gV.second->setLabelPosition(JKQTPGLabelCenteredOnData);
+        gH.second->setLabelPosition(JKQTPGLabelCenteredOnData);
+        gV.first->setVisible(false);
+        gH.first->setVisible(false);
+        plotV.redrawPlot();
+        plotH.redrawPlot();
+    });
+
+    app.addExportStepFunctor([&](){
+        gV.first->setVisible(true);
+        gH.first->setVisible(true);
         gV.second->setLabelPosition(JKQTPGLabelAwayFromXAxis);
         gV.second->setLabelBoxType(JKQTPGLSimpleBox);
         gV.second->setDrawLabelBoxFrame(true);
diff --git a/lib/jkqtplotter/graphs/jkqtpgraphlabelstylemixin.cpp b/lib/jkqtplotter/graphs/jkqtpgraphlabelstylemixin.cpp
index 40dd7f0033..f5a8b57cf6 100644
--- a/lib/jkqtplotter/graphs/jkqtpgraphlabelstylemixin.cpp
+++ b/lib/jkqtplotter/graphs/jkqtpgraphlabelstylemixin.cpp
@@ -35,6 +35,7 @@ QString JKQTPGraphLabelPosition2String(JKQTPGraphLabelPosition pos)
     case JKQTPGLabelAwayFromYAxis: return "label_away_from_yaxis";
     case JKQTPGLabelTowardsXAxis: return "label_towards_xaxis";
     case JKQTPGLabelTowardsYAxis: return "label_towards_xaxis";
+    case JKQTPGLabelCenteredOnData: return "label_centered";
     }
     return "label_away_from_xaxis";
 }
@@ -50,6 +51,7 @@ JKQTPGraphLabelPosition String2JKQTPGraphLabelPosition(const QString &pos)
     if (m=="label_away_from_yaxis" || m=="away_from_yaxis") return JKQTPGLabelAwayFromYAxis;
     if (m=="label_towars_xaxis" || m=="towars_xaxis") return JKQTPGLabelTowardsXAxis;
     if (m=="label_towars_yaxis" || m=="towars_yaxis") return JKQTPGLabelTowardsYAxis;
+    if (m=="label_centered" || m=="centered" || m=="label_centered_on_data" || m=="centered_on_data") return JKQTPGLabelCenteredOnData;
     return JKQTPGraphLabelDefault;
 }
 
@@ -185,6 +187,7 @@ bool JKQTPGraphValueLabelStyleMixin::isLabelPositioningGrowingInX() const
     case JKQTPGLabelAwayFromXAxis:
     case JKQTPGLabelTowardsXAxis:
     case JKQTPGLabelTowardsYAxis:
+    case JKQTPGLabelCenteredOnData:
         return false;
     }
     return false;
@@ -202,6 +205,7 @@ bool JKQTPGraphValueLabelStyleMixin::isLabelPositioningGrowingInY() const
     case JKQTPGLabelTowardsYAxis:
     case JKQTPGLabelLeftHandSide:
     case JKQTPGLabelRightHandSide:
+    case JKQTPGLabelCenteredOnData:
         return false;
     }
     return false;
@@ -257,7 +261,8 @@ void JKQTPGraphValueLabelStyleMixin::drawLabel(JKQTPEnhancedPainter &painter, co
         case LabelGeometry::BoxBottom:
             painter.drawLine(xDataPixel, QPointF(xDataPixel.x(), qMin(g.boxRect.top(),g.boxRect.bottom())));
             break;
-
+        case LabelGeometry::BoxCentered:
+            break;
         }
     }
 
@@ -296,6 +301,9 @@ JKQTPGraphValueLabelStyleMixin::LabelGeometry JKQTPGraphValueLabelStyleMixin::ca
         // rhs
         res.textRect=QRectF(xDataPixel.x()+res.labelOffsetPx+res.padX+res.lw/2.0, xDataPixel.y()-res.textSize.overallHeight/2.0, res.textSize.width, res.textSize.overallHeight);
         res.boxpos=LabelGeometry::BoxRight;
+    } else if (m_labelPosition==JKQTPGLabelCenteredOnData) {
+        res.textRect=QRectF(xDataPixel.x()-res.textSize.width/2.0, xDataPixel.y()-res.textSize.overallHeight/2.0, res.textSize.width, res.textSize.overallHeight);
+        res.boxpos=LabelGeometry::BoxCentered;
     }
 
     res.boxRect=QRectF(res.textRect.x()-res.padX-res.lw/2.0, res.textRect.y()-res.padY-res.lw/2.0, res.textRect.width()+res.padX*2.0+res.lw, res.textRect.height()+res.padY*2.0+res.lw);
diff --git a/lib/jkqtplotter/graphs/jkqtpgraphlabelstylemixin.h b/lib/jkqtplotter/graphs/jkqtpgraphlabelstylemixin.h
index be89ca71f3..c957bee852 100644
--- a/lib/jkqtplotter/graphs/jkqtpgraphlabelstylemixin.h
+++ b/lib/jkqtplotter/graphs/jkqtpgraphlabelstylemixin.h
@@ -52,6 +52,8 @@ enum JKQTPGraphLabelPosition {
     JKQTPGLabelLeftHandSide, /*!< \brief all labels always on the left-hand side of the datapoint \image html JKQTPGLabelLeftHandSide.png */
     JKQTPGLabelTowardsYAxis, /*!< \brief all labels between the datapoint and the y-axis the datapoint \image html JKQTPGLabelTowardsYAxis.png */
     JKQTPGLabelAwayFromYAxis, /*!< \brief all labels pointing away from the y-axis \image html JKQTPGLabelAwayFromYAxis.png */
+    JKQTPGLabelCenteredOnData, /*!< \brief graph label is drawn centered arond the data point \c (x,y) \image html JKQTPGLabelCenteredOnData.png */
+
 
     JKQTPGraphLabelDefault=JKQTPGLabelAwayFromXAxis,
 };
@@ -223,7 +225,8 @@ protected:
             BoxLeft,
             BoxRight,
             BoxTop,
-            BoxBottom
+            BoxBottom,
+            BoxCentered
         };
         BoxPos boxpos;
     };