double QwtBarCurve::dataOffset() {
if (bar_style == Vertical) {
const QwtScaleMap &xMap = plot()->canvasMap(xAxis());
int dx = abs(xMap.transform(x(1)) - xMap.transform(x(0)));
double bar_width = dx * (1 - bar_gap * 0.01);
if (plot()->isVisible()) {
for (int i = 2; i < dataSize(); i++) {
int min = abs(xMap.transform(x(i)) - xMap.transform(x(i - 1)));
if (min <= dx) dx = min;
}
int x1 = xMap.transform(minXValue()) + int(bar_offset * 0.01 * bar_width);
return xMap.invTransform(x1) - minXValue();
} else
return 0.5 * bar_offset * 0.01 * bar_width;
} else {
const QwtScaleMap &yMap = plot()->canvasMap(yAxis());
int dy = abs(yMap.transform(y(1)) - yMap.transform(y(0)));
double bar_width = dy * (1 - bar_gap * 0.01);
if (plot()->isVisible()) {
for (int i = 2; i < dataSize(); i++) {
int min = abs(yMap.transform(y(i)) - yMap.transform(y(i - 1)));
if (min <= dy) dy = min;
}
int y1 = yMap.transform(minYValue()) + int(bar_offset * 0.01 * bar_width);
return yMap.invTransform(y1) - minYValue();
} else
return 0.5 * bar_offset * 0.01 * bar_width;
}
return 0;
}
void PlotCurve::computeWaterfallOffsets()
{
Plot *plot = static_cast<Plot *>(this->plot());
Graph *g = static_cast<Graph *>(plot->parent());
// reset the offsets
d_x_offset = 0.0;
d_y_offset = 0.0;
if (g->isWaterfallPlot()){
int index = g->curveIndex(this);
int curves = g->curves();
auto firstCurve = g->curve(0);
// Get the minimum value of the first curve in this plot
double ymin = firstCurve ? firstCurve->minYValue() : 0.0;
PlotCurve *c = dynamic_cast<PlotCurve*>(g->curve(0));
if (index > 0 && c){
d_x_offset = index*g->waterfallXOffset()*0.01*plot->canvas()->width()/(double)(curves - 1);
d_y_offset = index*g->waterfallYOffset()*0.01*plot->canvas()->height()/(double)(curves - 1);
setZ(-index);
setBaseline(ymin-d_y_offset); // Fill down to minimum value of first curve
} else {
setZ(0);
setBaseline(ymin); // This is for when 'fill under curve' is turn on
}
if (g->grid())
g->grid()->setZ(-g->curves()/*Count()*/ - 1);
}
}
