/*!
\param axis Axis
\return Map for the axis on the canvas. With this map pixel coordinates can
translated to plot coordinates and vice versa.
\sa QwtDiMap, QwtPlot::transform, QwtPlot::invTransform
*/
QwtDiMap QwtPlot::canvasMap(int axis) const
{
QwtDiMap map;
if ( !d_canvas )
return map;
const QwtScaleDiv &sd = d_as[axis].scaleDiv();
map.setDblRange(sd.lBound(), sd.hBound(), sd.logScale());
if ( axisEnabled(axis) )
{
const QwtScale *s = d_scale[axis];
if ( axis == yLeft || axis == yRight )
{
int y = s->y() + s->startBorderDist() - d_canvas->y();
int h = s->height() - s->startBorderDist() - s->endBorderDist();
map.setIntRange(y + h - 1, y);
}
else
{
int x = s->x() + s->startBorderDist() - d_canvas->x();
int w = s->width() - s->startBorderDist() - s->endBorderDist();
map.setIntRange(x, x + w - 1);
}
}
else
{
const int margin = plotLayout()->canvasMargin(axis);
const QRect &canvasRect = d_canvas->contentsRect();
if ( axis == yLeft || axis == yRight )
{
map.setIntRange(canvasRect.bottom() - margin,
canvasRect.top() + margin);
}
else
{
map.setIntRange(canvasRect.left() + margin,
canvasRect.right() - margin);
}
}
return map;
}
/*!
\param axis Axis
\return Map for the axis on the canvas. With this map pixel coordinates can
translated to plot coordinates and vice versa.
\sa QwtDiMap, QwtPlot::transform, QwtPlot::invTransform
*/
QwtDiMap QwtPlot::canvasMap(int axis) const
{
QwtDiMap map;
if ( d_canvas && d_scale[axis] )
{
const QwtScale *s = d_scale[axis];
map = *s->scaleDraw();
if ( axis == yLeft || axis == yRight )
{
int y = s->y() + s->startBorderDist() - d_canvas->y();
int h = s->height() - s->startBorderDist() - s->endBorderDist();
map.setIntRange(y + h, y);
}
else
{
int x = s->x() + s->startBorderDist() - d_canvas->x();
int w = s->width() - s->startBorderDist() - s->endBorderDist();
map.setIntRange(x, x + w);
}
}
return map;
}
