code handles curves dinamically

renderarea.cpp

@@ -6,13 +6,28 @@ RenderArea::RenderArea(QWidget *parent) :
 	mBackgroundColour{36,35,35},
 	mShapeColour{251,250,250},
 	mShape{Astroid}
+{
+	OnShapeChanged();
+}
+
+QPointF RenderArea::ComputeAstroid(double 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};
+}
+
+QPointF RenderArea::ComputeCycloid(double t)
 {
 
 }
 
-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};
+QPointF RenderArea::ComputeHuygens(double t)
+{
+
+}
+
+QPointF RenderArea::ComputeHypo(double t)
+{
+
 }
 
 QSize RenderArea::minimumSizeHint() const
@@ -30,40 +45,64 @@ void RenderArea::paintEvent(QPaintEvent* event)
 	QPainter painter{this};
 	painter.setRenderHint(QPainter::Antialiasing,true);
 
-	switch (mShape) {
-		case Astroid:
-			mBackgroundColour = Qt::red;
-		break;
-		case Cycloid:
-			mBackgroundColour = Qt::green;
-
-		break;
-		case HuygensCycloid:
-			mBackgroundColour = Qt::blue;
-
-		break;
-		case HypoCycloid:
-			mBackgroundColour = Qt::yellow;
-
-		break;
-		default:
-		break;
-	}
 	painter.setBrush(mBackgroundColour);
 	painter.setPen(mShapeColour);
 
 	painter.drawRect(this->rect());
 
 	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);
+	double step{ mIntervalLenght / mStepCount };
+
+	for(float t = 0; t < mIntervalLenght; t += step){
+		QPointF point = Compute(t);
 
 		QPoint pixel;
-		pixel.setX(point.x() * scale + center.x());
-		pixel.setY(point.y() * scale + center.y());
+		pixel.setX(point.x() * mScale + center.x());
+		pixel.setY(point.y() * mScale + center.y());
 
 		painter.drawPoint(pixel);
 	}
 }
+
+void RenderArea::OnShapeChanged()
+{
+	switch (mShape) {
+		case Astroid:
+			mScale=50;
+			mIntervalLenght=2*M_PI;
+			mStepCount=256;
+		break;
+		case Cycloid:
+
+		break;
+		case HuygensCycloid:
+
+		break;
+		case HypoCycloid:
+
+		break;
+		default:
+		break;
+	}
+}
+
+QPointF RenderArea::Compute(double t)
+{
+	switch (mShape) {
+		case Astroid:
+			return ComputeAstroid(t);
+		break;
+		case Cycloid:
+		return ComputeCycloid(t);
+		break;
+		case HuygensCycloid:
+		return ComputeHuygens(t);
+		break;
+		case HypoCycloid:
+		return ComputeHypo(t);
+		break;
+		default:
+		break;
+	}
+	return QPointF{0,0};
+}

renderarea.h

@@ -21,7 +21,7 @@ class RenderArea : public QWidget
 
 		void setBackgroundColor(QColor color) { mBackgroundColour = color; }
 		QColor backgroundColor() const { return mBackgroundColour; }
-		void setShape(ShapesType shape) { mShape = shape; }
+		void setShape(ShapesType shape) { mShape = shape; OnShapeChanged(); }
 		ShapesType shape() const { return mShape; }
 
 
@@ -33,9 +33,15 @@ class RenderArea : public QWidget
 	public slots:
 
 	private:
-		QPointF ComputeAstroid(float t);
-		QColor mBackgroundColour;
-		QColor mShapeColour;
+		void OnShapeChanged();
+		QPointF ComputeAstroid(double t);
+		QPointF ComputeCycloid(double t);
+		QPointF ComputeHuygens(double t);
+		QPointF ComputeHypo(double t);
+		QPointF Compute(double t);
+		QColor mBackgroundColour,mShapeColour;
 		ShapesType mShape;
+		double mScale,mIntervalLenght;
+		int mStepCount;
 };
 #endif // RENDERAREA_H