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rendering astroid

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This commit is contained in:
thepra 2017-08-28 11:44:07 +02:00
parent 93af42b93d
commit 4f847aa671
3 changed files with 20 additions and 1 deletions
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1
.gitignore vendored
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@ -2,3 +2,4 @@
QtCurvesCpp.pro.user
QtCurvesCpp.pro.user.9311c87
QtCurvesCpp.pro.user
QtCurvesCpp.pro.user

19
renderarea.cpp
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@ -10,6 +10,11 @@ RenderArea::RenderArea(QWidget *parent) :
}
QPointF RenderArea::ComputeAstroid(float t){
double cos_t{cos(t)},sin_t{sin(t)},x{2*cos_t*cos_t*cos_t},y{2*sin_t*sin_t*sin_t};
return QPointF{x,y};
}
QSize RenderArea::minimumSizeHint() const
{
return QSize(100,100);
@ -48,5 +53,17 @@ void RenderArea::paintEvent(QPaintEvent* event)
painter.setPen(mShapeColour);
painter.drawRect(this->rect());
painter.drawLine(this->rect().topLeft(),this->rect().bottomRight());
QPoint center{this->rect().center()};
int stepCount{1024};
double scale{40},intervalLenght{2 * M_PI},step{intervalLenght / stepCount};
for(float t = 0; t < intervalLenght; t += step){
QPointF point = ComputeAstroid(t);
QPoint pixel;
pixel.setX(point.x() * scale + center.x());
pixel.setY(point.y() * scale + center.y());
painter.drawPoint(pixel);
}
}

1
renderarea.h
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@ -33,6 +33,7 @@ class RenderArea : public QWidget
public slots:
private:
QPointF ComputeAstroid(float t);
QColor mBackgroundColour;
QColor mShapeColour;
ShapesType mShape;