[Kst] kdeextragear-2/kst/kst

[George Staikos]

CVS commit by staikos: 

Interpolate y axis manually in data mode

CCMAIL: 68040-done at bugs.kde.org


  M +9 -1      kstview.cpp   1.57


--- kdeextragear-2/kst/kst/kstview.cpp  #1.56:1.57
@@ -405,5 +405,13 @@ void KstView::updateMouse() {
       for (KstBaseCurveList::Iterator i = pPlot->Curves.begin(); i != pPlot->Curves.end(); ++i) {
         double xpt = 0.0, ypt = 0.0;
-        (*i)->getPoint((*i)->sampleCount() * xpos / ((*i)->maxX() - (*i)->minX()), xpt, ypt);
+        double pt = (*i)->sampleCount() * xpos / ((*i)->maxX() - (*i)->minX());
+        (*i)->getPoint(pt, xpt, ypt);
+
+        // We have to get the previous point and interpolate y here, otherwise
+        // datamode y coordinates don't look right.
+        double xpt2 = 0.0, ypt2 = 0.0;
+        (*i)->getPoint(pt + 1, xpt2, ypt2);
+        ypt += (pt - xpt) * (ypt2 - ypt) / (xpt2 - xpt);
+
         if (fabs(ypos - ypt) < delta) {
           delta = fabs(ypos - ypt);