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42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
#include <QPainter>
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#include <QImage>
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#include <QtMath>
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#include "bitmapline.h"
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static QImage img2line(const QImage &img, int width)
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{
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Q_ASSERT(img.format() == QImage::Format_ARGB32_Premultiplied);
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QImage res(width, img.height(), QImage::Format_ARGB32_Premultiplied);
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const int srcBpl = img.bytesPerLine();
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const int dstBpl = res.bytesPerLine();
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const uchar *srcBits = img.bits();
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uchar *dstBits = res.bits();
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for (int i = 0; i < img.height(); i++) {
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const uchar *srcLine = srcBits + srcBpl * i;
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uchar *dstLine = dstBits + dstBpl * i;
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for (int j = dstBpl; j > 0; j -= srcBpl, dstLine += srcBpl)
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memcpy(dstLine, srcLine, qMin(j, srcBpl));
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}
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return res;
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}
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void BitmapLine::draw(QPainter *painter, const QPolygonF &line,
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const QImage &img)
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{
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for (int i = 1; i < line.size(); i++) {
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QLineF segment(line.at(i-1).x(), line.at(i-1).y(), line.at(i).x(),
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line.at(i).y());
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painter->save();
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painter->translate(segment.p1());
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painter->rotate(-segment.angle());
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painter->drawImage(0.0, -img.height()/2.0, img2line(img,
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qCeil(segment.length())));
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painter->restore();
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}
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}
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