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Store only one value for afterglow

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Gitea
2019-09-17 23:20:56 +02:00
parent 50fb47f513
commit 09e1d1ff16
2 changed files with 3 additions and 3 deletions
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4
osciwidget.cpp
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@@ -34,7 +34,6 @@ void OsciWidget::setAfterglow(float afterglow){
m_afterglow = afterglow; m_afterglow = afterglow;
// percentage of the image that should be visible after one second // percentage of the image that should be visible after one second
// i.e. factor^fps=afterglow -> factor = afterglow^(1/fps) // i.e. factor^fps=afterglow -> factor = afterglow^(1/fps)
m_afterglowColor = 255 * pow(afterglow, 1.0/m_fps);
} }
void OsciWidget::setLightspeed(int lightspeed) { void OsciWidget::setLightspeed(int lightspeed) {
@@ -86,7 +85,8 @@ void OsciWidget::updateFrameBuffer()
// darkening last frame // darkening last frame
painter.setCompositionMode(QPainter::CompositionMode_Multiply); painter.setCompositionMode(QPainter::CompositionMode_Multiply);
painter.setPen({}); painter.setPen({});
painter.setBrush(QColor(m_afterglowColor, m_afterglowColor, m_afterglowColor)); auto afterglowColor = 255 * pow(m_afterglow, 1.0/m_fps);
painter.setBrush(QColor(afterglowColor, afterglowColor, afterglowColor));
painter.drawRect(m_pixmap.rect()); painter.drawRect(m_pixmap.rect());
// drawing new lines ontop // drawing new lines ontop

2
osciwidget.h
View File

@@ -44,7 +44,7 @@ private:
private: private:
float m_factor{2.f}; float m_factor{2.f};
int m_fps{30}, m_afterglowColor{175}; int m_fps{30};
float m_afterglow{0.2}; float m_afterglow{0.2};
float m_lightspeed{35.f}; float m_lightspeed{35.f};