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https://github.com/tumic0/GPXSee.git
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145 lines
3.2 KiB
C++
145 lines
3.2 KiB
C++
#include <cmath>
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#include <QPainter>
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#include "config.h"
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#include "misc.h"
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#include "scaleitem.h"
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#define BORDER_WIDTH 1
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#define SCALE_WIDTH 132
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#define SCALE_HEIGHT 5
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#define SEGMENTS 3
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#define PADDING 4
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ScaleItem::ScaleItem(QGraphicsItem *parent) : QGraphicsItem(parent)
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{
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_units = Metric;
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_res = 1.0;
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_digitalZoom = 0;
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#ifndef Q_OS_MAC
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setCacheMode(QGraphicsItem::DeviceCoordinateCache);
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#endif // Q_OS_MAC
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}
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void ScaleItem::updateBoundingRect()
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{
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QFont font;
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font.setPixelSize(FONT_SIZE);
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font.setFamily(FONT_FAMILY);
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QFontMetrics fm(font);
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QRect ss, es, us;
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ss = fm.tightBoundingRect(QString::number(0));
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es = fm.tightBoundingRect(QString::number(_length * SEGMENTS));
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us = fm.tightBoundingRect(units());
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_boundingRect = QRectF(-ss.width()/2, 0, _width * SEGMENTS + ss.width()/2
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+ qMax(us.width() + PADDING, es.width()/2) + 1, SCALE_HEIGHT + PADDING
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+ ss.height() + 2*fm.descent());
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}
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void ScaleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
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QWidget *widget)
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{
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Q_UNUSED(option);
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Q_UNUSED(widget);
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QFont font;
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font.setPixelSize(FONT_SIZE);
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font.setFamily(FONT_FAMILY);
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QFontMetrics fm(font);
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QRect br;
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QPen pen = QPen(Qt::black, BORDER_WIDTH);
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painter->setRenderHint(QPainter::Antialiasing, false);
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painter->setFont(font);
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painter->setPen(pen);
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for (int i = 0; i <= SEGMENTS; i++) {
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QString label = QString::number(_length * i);
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br = fm.tightBoundingRect(label);
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painter->drawText(_width * i - br.width()/2, br.height() + 1, label);
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}
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painter->drawText(_width * SEGMENTS + PADDING, SCALE_HEIGHT + PADDING
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+ br.height() + fm.descent(), units());
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painter->drawRect(QRectF(0, br.height() + PADDING, SEGMENTS * _width,
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SCALE_HEIGHT));
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for (int i = 0; i < SEGMENTS; i += 2)
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painter->fillRect(QRectF(i * _width, br.height() + PADDING, _width,
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SCALE_HEIGHT), Qt::black);
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/*
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painter->setPen(Qt::red);
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painter->drawRect(boundingRect());
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*/
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}
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QString ScaleItem::units() const
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{
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if (_units == Imperial)
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return _scale ? qApp->translate("ScaleItem", "mi")
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: qApp->translate("ScaleItem", "ft");
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else
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return _scale ? qApp->translate("ScaleItem", "km")
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: qApp->translate("ScaleItem", "m");
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}
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void ScaleItem::computeScale()
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{
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qreal res = _res * pow(2, -_digitalZoom);
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if (_units == Imperial) {
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_length = niceNum((res * M2FT * SCALE_WIDTH) / SEGMENTS, 1);
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if (_length >= MIINFT) {
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_length = niceNum((res * M2FT * FT2MI * SCALE_WIDTH) / SEGMENTS, 1);
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_width = (_length / (res * M2FT * FT2MI));
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_scale = true;
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} else {
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_width = (_length / (res * M2FT));
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_scale = false;
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}
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} else {
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_length = niceNum((res * SCALE_WIDTH) / SEGMENTS, 1);
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if (_length >= KMINM) {
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_length *= M2KM;
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_width = (_length / (res * M2KM));
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_scale = true;
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} else {
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_width = (_length / res);
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_scale = false;
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}
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}
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}
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void ScaleItem::setResolution(qreal res)
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{
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prepareGeometryChange();
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_res = res;
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computeScale();
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updateBoundingRect();
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update();
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}
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void ScaleItem::setUnits(enum Units units)
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{
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prepareGeometryChange();
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_units = units;
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computeScale();
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updateBoundingRect();
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update();
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}
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void ScaleItem::setDigitalZoom(int zoom)
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{
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prepareGeometryChange();
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_digitalZoom = zoom;
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computeScale();
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updateBoundingRect();
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update();
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setScale(pow(2, -_digitalZoom));
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}
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