Корректировка координатной сетки

main.cpp

@@ -11,6 +11,7 @@ int main(int argc, char *argv[])
      */
     QTSGraph w(600, 600);
 
+    //w.SwapYAxis = true;
     w.show();
     return a.exec();
 }
@@ -19,7 +20,6 @@ void QTSGraph::PaintBox()
 {
     // Начало рисования
 
-    ShowAxes();
     SetColor(clGreen);
     Line(0, 0, 600, 600);
     SetColor(0xFF0000);

qtsgraph.cpp

@@ -267,13 +267,10 @@ void QTSGraph::paintEvent(QPaintEvent *event)
 {
     QPainter p(this);
     p.drawPixmap(0, 0, Canvas);
+    int correctY = 0;
+    int mult = 1;
     if(AxesVisible)
     {
-        p.setPen(QPen(QBrush(QColor(Qt::lightGray)), 1));
-        p.drawLine(Canvas.width() / 2, 0, Canvas.width() / 2, Canvas.height() - 1);
-        p.drawLine(0, Canvas.height() / 2, Canvas.width() - 1, Canvas.height() / 2);
-        p.drawText(Canvas.width() / 2 + 2, 12, QString::number(Canvas.width() / 2));
-        p.drawText(2, Canvas.height() / 2 - 2, QString::number(Canvas.height() / 2));
         p.setPen(QPen(QBrush(QColor(Qt::red)), 3));
         if(SwapYAxis)
         {
@@ -283,17 +280,7 @@ void QTSGraph::paintEvent(QPaintEvent *event)
             p.drawLine(0, Canvas.height() - 1, 0, 0);
             p.drawLine(10, 10, 0, 0);
             p.drawText(12, 12, "Y");
-
-            p.setPen(QPen(QBrush(QColor(0xDDDDDD)), 1));
-            p.drawLine(Canvas.width() / 4, 0, Canvas.width() / 4, Canvas.height() - 1);
-            p.drawLine(0, Canvas.height() / 4, Canvas.width() - 1, Canvas.height() / 4);
-            p.drawText(Canvas.width() / 4 + 2, 12, QString::number(Canvas.width() / 4));
-            p.drawText(2, Canvas.height() / 4 - 2, QString::number(3 * Canvas.height() / 4));
-
-            p.drawLine(3 * Canvas.width() / 4, 0, 3 * Canvas.width() / 4, Canvas.height() - 1);
-            p.drawLine(0, 3 * Canvas.height() / 4, Canvas.width() - 1, 3 * Canvas.height() / 4);
-            p.drawText(3 * Canvas.width() / 4 + 2, 12, QString::number(3 * Canvas.width() / 4));
-            p.drawText(2, 3 * Canvas.height() / 4 - 2, QString::number(Canvas.height() / 4));
+            correctY = 1;
         }
         else
         {
@@ -303,18 +290,25 @@ void QTSGraph::paintEvent(QPaintEvent *event)
             p.drawLine(0, Canvas.height() - 1, 0, 0);
             p.drawLine(10, Canvas.height() - 10, 0, Canvas.height() - 1);
             p.drawText(13, Canvas.height() - 2, "Y");
+        }
+        p.setPen(QPen(QBrush(QColor(Qt::lightGray)), 1));
+        p.drawLine(Canvas.width() / 2, 0, Canvas.width() / 2, Canvas.height() - 1);
+        p.drawLine(0, Canvas.height() / 2 - correctY, Canvas.width() - 1, Canvas.height() / 2 - correctY);
+        p.drawText(Canvas.width() / 2 + 2, 12, QString::number(Canvas.width() / 2));
+        p.drawText(2, Canvas.height() / 2 - 2, QString::number(Canvas.height() / 2));
 
         p.setPen(QPen(QBrush(QColor(0xDDDDDD)), 1));
         p.drawLine(Canvas.width() / 4, 0, Canvas.width() / 4, Canvas.height() - 1);
-            p.drawLine(0, Canvas.height() / 4, Canvas.width() - 1, Canvas.height() / 4);
+        p.drawLine(0, Canvas.height() / 4 - correctY, Canvas.width() - 1, Canvas.height() / 4 - correctY);
         p.drawText(Canvas.width() / 4 + 2, 12, QString::number(Canvas.width() / 4));
-            p.drawText(2, Canvas.height() / 4 - 2, QString::number(Canvas.height() / 4));
+        if(correctY) mult = 3;
+        p.drawText(2, Canvas.height() / 4 - 2, QString::number(mult * Canvas.height() / 4));
 
         p.drawLine(3 * Canvas.width() / 4, 0, 3 * Canvas.width() / 4, Canvas.height() - 1);
-            p.drawLine(0, 3 * Canvas.height() / 4, Canvas.width() - 1, 3 * Canvas.height() / 4);
+        p.drawLine(0, 3 * Canvas.height() / 4 - 1, Canvas.width() - 1, 3 * Canvas.height() / 4 - correctY);
         p.drawText(3 * Canvas.width() / 4 + 2, 12, QString::number(3 * Canvas.width() / 4));
-            p.drawText(2, 3 * Canvas.height() / 4 - 2, QString::number(3 * Canvas.height() / 4));
-        }
+        mult = correctY ? 1 : 3;
+        p.drawText(2, 3 * Canvas.height() / 4 - 2, QString::number(mult * Canvas.height() / 4));
     }
 }