void LegendItem::paint(QPainter *painter) {
if (!isVisible()) {
return;
}
RelationList legendItems;
if (_auto) {
legendItems = plot()->renderItem(PlotRenderItem::Cartesian)->relationList();
} else {
legendItems = _relations;
}
int count = legendItems.count();
if (count <= 0) { // no legend or box if there are no legend items
return;
}
QFont font(_font);
font.setPointSizeF(view()->scaledFontSize(_fontScale, *painter->device()));
painter->setFont(font);
// generate string list of relation names
QStringList names;
//bool allAuto = true;
bool sameX = true;
bool sameYUnits = true;
LabelInfo label_info = legendItems.at(0)->xLabelInfo();
QString yUnits = legendItems.at(0)->yLabelInfo().units;
for (int i = 0; i<count; i++) {
RelationPtr relation = legendItems.at(i);
if (relation->descriptiveNameIsManual()) {
//allAuto = false;
}
if (relation->xLabelInfo() != label_info) {
sameX = false;
}
// sameYUnits is false if any non empty units are defined differently.
if (yUnits.isEmpty()) {
yUnits = relation->yLabelInfo().units;
} else if (relation->yLabelInfo().units != yUnits) {
if (!relation->yLabelInfo().units.isEmpty()) {
sameYUnits = false;
}
}
}
// if (!allAuto) {
// for (int i = 0; i<count; i++) {
// names.append(legendItems.at(i)->descriptiveName());
// }
// } else {
// FIXME: move most of this into a new function, relation->legend_name
// then create separate [legend_name] and Auto in the relation dialog.
// show relation->legend_name in dialog when [x] Auto
for (int i = 0; i<count; i++) {
RelationPtr relation = legendItems.at(i);
QString label = relation->legendName(sameX, sameYUnits);
int i_dup = names.indexOf(label);
if (i_dup<0) {
names.append(label);
} else {
RelationPtr dup_relation = legendItems.at(i_dup);
if (!dup_relation->yLabelInfo().file.isEmpty()) {
names.replace(i_dup, label + " (" + dup_relation->yLabelInfo().escapedFile() + ')');
}
if (!relation->yLabelInfo().file.isEmpty()) {
names.append(label + " (" + relation->yLabelInfo().escapedFile() + ')');
}
}
}
QSize legendSize(0, 0);
QSize titleSize(0,0);
Label::Parsed *parsed = Label::parse(_title, _color);
int pad = painter->fontMetrics().ascent()/4;
Label::RenderContext rc(painter->font(), painter);
Label::renderLabel(rc, parsed->chunk, false, false);
if (!_title.isEmpty()) {
titleSize.setWidth(rc.x+3*pad);
titleSize.setHeight(painter->fontMetrics().height()+pad);
}
QList<QSize> sizes;
int max_w = 0;
int max_h = 0;
for (int i = 0; i<count; i++) {
RelationPtr relation = legendItems.at(i);
QSize size;
painter->save();
size = paintRelation(names.at(i), relation, painter, false);
painter->restore();
sizes.append(size);
max_w = qMax(max_w, size.width());
max_h = qMax(max_h, size.height());
}
// determine number of rows and number of columns
int n_rows = 0;
int n_cols = 0;
if (_verticalDisplay) {
int h=titleSize.height();
for (int i = 0; i<count; i++) {
h+=sizes.at(i).height();
}
int max_legend_height = _plotItem->plotRect().height()*0.6+1;
n_cols = qMin(count, h / max_legend_height + 1);
n_rows = count / n_cols;
while (n_rows*n_cols<count) {
n_rows++;
}
} else {
int w = 0;
for (int i = 0; i<count; i++) {
w+=sizes.at(i).width();
}
int max_legend_width = _plotItem->plotRect().width()*0.8+1;
n_rows = qMin(count, w / max_legend_width+1);
n_cols = count/n_rows;
while (n_rows*n_cols<count) {
n_cols++;
}
}
// determine the dimensions of each column
QList<QSize> col_sizes;
for (int i=0; i<n_cols; i++) {
col_sizes.append(QSize(0,0));
}
for (int i = 0; i<count; i++) {
int col = i/n_rows;
col_sizes[col].rheight()+= sizes.at(i).height();
col_sizes[col].setWidth(qMax(sizes.at(i).width(), col_sizes.at(col).width()));
}
// determine the dimensions of the legend
int w = 0;
int h = 0;
for (int col = 0; col < n_cols; col++) {
w += col_sizes.at(col).width();
h = qMax(h, col_sizes.at(col).height());
}
legendSize.setHeight(h + titleSize.height());
legendSize.setWidth(qMax(titleSize.width(), w));
setViewRect(rect().x(), rect().y(), legendSize.width()+pad, legendSize.height()+pad);
// Now paint everything
painter->drawRect(rect());
int x=rect().x();
int y=rect().y();
if (!_title.isEmpty()) {
rc.y = rect().y() + titleSize.height()-pad;
rc.x = qMax(rect().x()+pad, rect().x() + legendSize.width()/2 - titleSize.width()/2);
Label::renderLabel(rc, parsed->chunk, false, true);
y+= titleSize.height();
}
legendSize.setWidth(0);
legendSize.setHeight(0);
for (int i = 0; i<count; i++) {
RelationPtr relation = legendItems.at(i);
painter->save();
painter->translate(x,y);
paintRelation(names.at(i), relation, painter, true);
painter->restore();
int col = i/n_rows;
int row = i%n_rows;
if (row == n_rows-1) { // end of a column
x += col_sizes.at(col).width();
y = rect().y() + titleSize.height();
} else {
y += sizes.at(i).height();
}
}
delete parsed;
}
