[Kst] kdeextragear-2/kst

[George Staikos]

CVS commit by staikos: 

drawing is much faster now - eliminated unnecessary internal redraws -
profiling shows a big improvement, and it's very noticeable with, for example,
dragging labels


  M +0 -1      devel-docs/newviewtodo.txt   1.31
  M +23 -9     kst/kst2dplot.cpp   1.92


--- kdeextragear-2/kst/devel-docs/newviewtodo.txt  #1.30:1.31
@@ -39,5 +39,4 @@
 - Layout mode flicker                               (George)
 - undo/redo
-- new view painting is very slow                    (George)
 
 

--- kdeextragear-2/kst/kst/kst2dplot.cpp  #1.91:1.92
@@ -226,5 +226,5 @@ void Kst2DPlot::commonConstructor(const 
                                 bool y_log) {
 
-  _xLeft = 0;
+  _xLeft = -99999999;
   _hasFocus = false;
   _copy_x = _copy_y = KST::NOPOINT;
@@ -972,12 +972,24 @@ void Kst2DPlot::triggerBorderAdjustments
 void Kst2DPlot::paint(QPainter& p) {
   setpixrect(_geom.x(), _geom.y());
-  _xLeft = getXBorder(p);
+  double tmp = getXBorder(p);
   PlotDisplayManager *dm = PlotDisplayManager::self();
-  if (_xLeft > dm->xOffset) {
-    dm->xOffset = _xLeft;
-    triggerBorderAdjustments(_xLeft);
+  if (tmp > dm->xOffset) {
+    if (_xLeft != tmp) {
+      dm->xOffset = _xLeft = tmp;
+      draw();
   } else {
+      dm->xOffset = tmp;
+    }
+    triggerBorderAdjustments(_xLeft);
+  } else if (tmp < dm->xOffset) {
     _xLeft = dm->xOffset;
     draw();
+  } else {
+    if (_xLeft != tmp) {
+      _xLeft = tmp;
+      draw();
+    } else {
+      _xLeft = tmp;
+    }
   }
   _buffer.paintInto(p, geometry());
@@ -991,11 +1003,13 @@ void Kst2DPlot::draw() {
   _buffer.buffer().fill(backgroundColor());
   QPainter p(&_buffer.buffer());
-  _xLeft = getXBorder(p);
+  double tmp = getXBorder(p);
   PlotDisplayManager *dm = PlotDisplayManager::self();
-  if (_xLeft > dm->xOffset) {
-    dm->xOffset = _xLeft;
+  if (tmp > dm->xOffset) {
+    dm->xOffset = _xLeft = tmp;
     // Danger: recusion --  triggerBorderAdjustments(x);
-  } else {
+  } else if (tmp < dm->xOffset) {
     _xLeft = dm->xOffset;
+  } else {
+    _xLeft = tmp;
   }
   paint(p, dm->xOffset);