diff options
Diffstat (limited to 'grapher/GraphWidget.cxx')
| -rw-r--r-- | grapher/GraphWidget.cxx | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/grapher/GraphWidget.cxx b/grapher/GraphWidget.cxx index be1ebdcd..ce2f934f 100644 --- a/grapher/GraphWidget.cxx +++ b/grapher/GraphWidget.cxx @@ -241,8 +241,10 @@ bool GraphWidget::on_motion_notify_event(GdkEventMotion* event) const int width = allocation.get_width(); double motion = (_mouseX - _dragOriginX) / (double) width; double increment = motion * (_dragOrigLeft - _dragOrigRight); - _activeGraph->_left = _dragOrigLeft + increment; - _activeGraph->_right = _dragOrigRight + increment; + _activeGraph->_left + = _dragOrigLeft + increment / _activeGraph->_zoomFactor; + _activeGraph->_right + = _dragOrigRight + increment / _activeGraph->_zoomFactor; queue_draw(); } if (_hoverText && _hoverText->isVisible()) @@ -263,10 +265,16 @@ bool GraphWidget::on_scroll_event(GdkEventScroll* event) { if ((*gitr)->containsPoint(event->x, event->y)) { + double oldZoom = (*gitr)->_zoomFactor; if (event->direction == GDK_SCROLL_UP) - (*gitr)->_zoomFactor += .1; + (*gitr)->_zoomFactor *= 1.1; else if (event->direction == GDK_SCROLL_DOWN) - (*gitr)->_zoomFactor -= .1; + (*gitr)->_zoomFactor /= 1.1; + int64_t left, right; + double top, bottom; + (*gitr)->getExtents(left, right, top, bottom); + right = left - (left - right) * (oldZoom / (*gitr)->_zoomFactor); + (*gitr)->setExtents(left, right, top, bottom); queue_draw(); break; } |