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Added track scale info

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Martin Tůma
2016-01-14 00:37:51 +01:00
parent 5bd4999205
commit c2391929d3
12 changed files with 256 additions and 35 deletions
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src/scaleitem.cpp Normal file
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#include <QPainter>
#include "config.h"
#include "ll.h"
#include "nicenum.h"
#include "scaleitem.h"
#define SCALE_WIDTH 132
#define SCALE_HEIGHT 5
#define SEGMENTS 3
#define PADDING 4
ScaleItem::ScaleItem(QGraphicsItem *parent) : QGraphicsItem(parent)
{
_units = Metric;
}
QRectF ScaleItem::boundingRect() const
{
QFont font;
font.setPixelSize(FONT_SIZE);
font.setFamily(FONT_FAMILY);
QFontMetrics fm(font);
QRect ss, es, us;
ss = fm.tightBoundingRect(QString::number(0));
es = fm.tightBoundingRect(QString::number(_length * SEGMENTS));
us = fm.tightBoundingRect(units());
return QRectF(-ss.width()/2, -(PADDING + ss.height() + fm.descent()),
_width * SEGMENTS + ss.width()/2 + qMax(us.width() + PADDING, es.width()/2),
SCALE_HEIGHT + PADDING + ss.height() + 2*fm.descent());
}
void ScaleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
Q_UNUSED(option);
Q_UNUSED(widget);
QFont font;
font.setPixelSize(FONT_SIZE);
font.setFamily(FONT_FAMILY);
QFontMetrics fm(font);
painter->setFont(font);
for (int i = 0; i <= SEGMENTS; i++) {
QString label = QString::number(_length * i);
QRect br = fm.tightBoundingRect(label);
painter->drawText(_width * i - br.width()/2, -PADDING, label);
}
painter->drawText(_width * SEGMENTS + PADDING, SCALE_HEIGHT + fm.descent(),
units());
painter->drawRect(QRectF(0, 0, SEGMENTS * _width, SCALE_HEIGHT));
for (int i = 0; i < SEGMENTS; i += 2)
painter->fillRect(QRectF(i * _width, 0, _width, SCALE_HEIGHT),
Qt::black);
/*
painter->setPen(Qt::red);
painter->drawRect(boundingRect());
*/
}
QString ScaleItem::units() const
{
if (_units == Imperial)
return _scale ? QObject::tr("mi") : QObject::tr("ft");
else
return _scale ? QObject::tr("km") : QObject::tr("m");
}
void ScaleItem::computeScale()
{
qreal res = zoom2resolution(_zoom, _lat);
if (_units == Imperial) {
_length = niceNum((res * M2FT * SCALE_WIDTH) / SEGMENTS, 1);
if (_length >= MIINFT) {
_length = niceNum((res * M2FT * FT2MI * SCALE_WIDTH) / SEGMENTS, 1);
_width = (_length / (res * M2FT * FT2MI));
_scale = true;
} else {
_width = (_length / (res * M2FT));
_scale = false;
}
} else {
_length = niceNum((res * SCALE_WIDTH) / SEGMENTS, 1);
if (_length >= KMINM) {
_length *= M2KM;
_width = (_length / (res * M2KM));
_scale = true;
} else {
_width = (_length / res);
_scale = false;
}
}
}
void ScaleItem::setLatitude(qreal lat)
{
_lat = lat;
computeScale();
prepareGeometryChange();
}
void ScaleItem::setZoom(int z)
{
_zoom = z;
computeScale();
prepareGeometryChange();
}
void ScaleItem::setUnits(enum Units units)
{
_units = units;
computeScale();
prepareGeometryChange();
}