60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#include "graphrenderer.h"
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#include <iterator>
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#include <QPixmap>
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#include <QPainter>
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#include <QPalette>
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QPixmap GraphRenderer::render(const QSize &size, const frame_t *frameBegin, const frame_t *frameEnd, const QPalette &palette)
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{
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QPixmap pixmap{size};
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QPainter painter;
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painter.begin(&pixmap);
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painter.fillRect(pixmap.rect(), palette.base());
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painter.setPen(Qt::white);
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painter.setBrush(Qt::black);
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painter.drawRect(QRect({}, size));
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render(size, frameBegin, frameEnd, painter, palette);
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painter.end();
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return pixmap;
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}
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void GraphRenderer::render(const QSize &size, const frame_t *frameBegin, const frame_t *frameEnd, QPainter &painter, const QPalette &palette)
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{
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if (frameEnd == frameBegin)
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return;
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painter.setPen(QPen{palette.color(QPalette::Text)});
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painter.setBrush(palette.text());
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const auto framesPerPixel = std::distance(frameBegin, frameEnd) / size.width();
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for (int x = 0; x < size.width(); x++)
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{
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const frame_t *begin = frameBegin + (x * framesPerPixel);
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const frame_t *end = begin + framesPerPixel;
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frame_t min{1.f, 1.f}, max{-1.f, -1.f};
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for (auto iter = begin; iter != end; iter++)
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{
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if ((*iter)[0] < min[0])
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min[0] = (*iter)[0];
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if ((*iter)[1] < min[1])
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min[1] = (*iter)[1];
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if ((*iter)[0] > max[0])
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max[0] = (*iter)[0];
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if ((*iter)[1] > max[1])
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max[1] = (*iter)[1];
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}
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painter.drawLine(x, (size.height() / 2) - (min[0] * (size.height() / 2)),
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x, (size.height() / 2) + (max[0] * (size.height() / 2)));
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}
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}
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