Don't reset output size on radius change (fix #8090)

Prevent input of invalid output size by changing to spin boxes for rows and columns

src/plugins/heatmap/heatmapgui.cpp

@@ -37,7 +37,8 @@
 //standard includes
 
 HeatmapGui::HeatmapGui( QWidget* parent, Qt::WFlags fl )
-    : QDialog( parent, fl )
+    : QDialog( parent, fl ),
+    mRows( 500 )
 {
   setupUi( this );
 
@@ -79,6 +80,8 @@ HeatmapGui::HeatmapGui( QWidget* parent, Qt::WFlags fl )
   mFormatCombo->setCurrentIndex( myTiffIndex );
 
   updateBBox();
+  updateSize();
+
   //finally set right the ok button
   enableOrDisableOkButton();
 }
@@ -149,22 +152,22 @@ void HeatmapGui::on_advancedGroupBox_toggled( bool enabled )
   }
 }
 
-void HeatmapGui::on_rowLineEdit_editingFinished()
+void HeatmapGui::on_mRowsSpinBox_editingFinished()
 {
-  mRows = rowLineEdit->text().toInt();
+  mRows = mRowsSpinBox->value();
   mYcellsize = mBBox.height() / mRows;
   mXcellsize = mYcellsize;
-  mColumns = mBBox.width() / mXcellsize + 1;
+  mColumns = max( mBBox.width() / mXcellsize, 1 );
 
   updateSize();
 }
 
-void HeatmapGui::on_columnLineEdit_editingFinished()
+void HeatmapGui::on_mColumnsSpinBox_editingFinished()
 {
-  mColumns = columnLineEdit->text().toInt();
+  mColumns = mColumnsSpinBox->value();
   mXcellsize = mBBox.width() / mColumns;
   mYcellsize = mXcellsize;
-  mRows = mBBox.height() / mYcellsize + 1;
+  mRows = max( mBBox.height() / mYcellsize, 1 );
 
   updateSize();
 }
@@ -173,8 +176,8 @@ void HeatmapGui::on_cellXLineEdit_editingFinished()
 {
   mXcellsize = cellXLineEdit->text().toDouble();
   mYcellsize = mXcellsize;
-  mRows = mBBox.height() / mYcellsize + 1;
-  mColumns = mBBox.width() / mXcellsize + 1;
+  mRows = max( mBBox.height() / mYcellsize, 1 );
+  mColumns = max( mBBox.width() / mXcellsize, 1 );
 
   updateSize();
 }
@@ -183,8 +186,8 @@ void HeatmapGui::on_cellYLineEdit_editingFinished()
 {
   mYcellsize = cellYLineEdit->text().toDouble();
   mXcellsize = mYcellsize;
-  mRows = mBBox.height() / mYcellsize + 1;
-  mColumns = mBBox.width() / mXcellsize + 1;
+  mRows = max( mBBox.height() / mYcellsize, 1 );
+  mColumns = max( mBBox.width() / mXcellsize, 1 );
 
   updateSize();
 }
@@ -316,8 +319,8 @@ void HeatmapGui::populateFields()
 
 void HeatmapGui::updateSize()
 {
-  rowLineEdit->setText( QString::number( mRows ) );
-  columnLineEdit->setText( QString::number( mColumns ) );
+  mRowsSpinBox->setValue( mRows );
+  mColumnsSpinBox->setValue( mColumns );
   cellXLineEdit->setText( QString::number( mXcellsize ) );
   cellYLineEdit->setText( QString::number( mYcellsize ) );
 }
@@ -363,17 +366,13 @@ void HeatmapGui::updateBBox()
   mBBox.setYMinimum( mBBox.yMinimum() - radiusInMapUnits );
   mBBox.setXMaximum( mBBox.xMaximum() + radiusInMapUnits );
   mBBox.setYMaximum( mBBox.yMaximum() + radiusInMapUnits );
-  mRows = 500;
+
+  // Leave number of rows the same, and calculate new corresponding cell size and number of columns
   mYcellsize = mBBox.height() / mRows;
   mXcellsize = mYcellsize;
-  // +1 should be  added wherever a fractional part of cell might occur
-  mColumns = mBBox.width() / mXcellsize + 1;
-  mRows += 1;
+  mColumns = max( mBBox.width() / mXcellsize, 1 );
 
-  if ( advancedGroupBox->isChecked() )
-  {
-    updateSize();
-  }
+  updateSize();
 }
 
 double HeatmapGui::mapUnitsOf( double meters, QgsCoordinateReferenceSystem layerCrs )

src/plugins/heatmap/heatmapgui.h

@@ -114,8 +114,8 @@ class HeatmapGui : public QDialog, private Ui::HeatmapGuiBase
     void on_mBrowseButton_clicked();
     void on_mOutputRasterLineEdit_editingFinished();
     void on_advancedGroupBox_toggled( bool enabled );
-    void on_rowLineEdit_editingFinished();
-    void on_columnLineEdit_editingFinished();
+    void on_mRowsSpinBox_editingFinished();
+    void on_mColumnsSpinBox_editingFinished();
     void on_cellXLineEdit_editingFinished();
     void on_cellYLineEdit_editingFinished();
     void on_radiusFieldCombo_currentIndexChanged( int index );

src/plugins/heatmap/heatmapguibase.ui

@@ -130,7 +130,7 @@
            <string>Rows</string>
           </property>
           <property name="buddy">
-           <cstring>rowLineEdit</cstring>
+           <cstring>mRowsSpinBox</cstring>
           </property>
          </widget>
         </item>
@@ -150,7 +150,7 @@
            <string>Columns</string>
           </property>
           <property name="buddy">
-           <cstring>columnLineEdit</cstring>
+           <cstring>mColumnsSpinBox</cstring>
           </property>
          </widget>
         </item>
@@ -165,10 +165,24 @@
          </widget>
         </item>
         <item row="0" column="1">
-         <widget class="QLineEdit" name="rowLineEdit"/>
+         <widget class="QSpinBox" name="mRowsSpinBox">
+          <property name="minimum">
+           <number>1</number>
+          </property>
+          <property name="maximum">
+           <number>999999</number>
+          </property>
+         </widget>
         </item>
         <item row="0" column="3">
-         <widget class="QLineEdit" name="columnLineEdit"/>
+         <widget class="QSpinBox" name="mColumnsSpinBox">
+          <property name="minimum">
+           <number>1</number>
+          </property>
+          <property name="maximum">
+           <number>999999</number>
+          </property>
+         </widget>
         </item>
         <item row="1" column="1">
          <widget class="QLineEdit" name="cellXLineEdit"/>
@@ -292,8 +306,8 @@
   <tabstop>mBufferLineEdit</tabstop>
   <tabstop>mRadiusUnitCombo</tabstop>
   <tabstop>advancedGroupBox</tabstop>
-  <tabstop>rowLineEdit</tabstop>
-  <tabstop>columnLineEdit</tabstop>
+  <tabstop>mRowsSpinBox</tabstop>
+  <tabstop>mColumnsSpinBox</tabstop>
   <tabstop>cellXLineEdit</tabstop>
   <tabstop>cellYLineEdit</tabstop>
   <tabstop>kernelShapeCombo</tabstop>