Add envelope transform feature

Source/PS_Source/ProcessedStretch.h

@@ -426,7 +426,7 @@ inline void spectrum_do_free_filter(shared_envelope& env, int nfreq, double samp
 		if (binhz >= 30.0)
 		{
 			double norm = 0.150542*log(0.0333333*binhz);
-			double db = jmap<double>(env->GetInterpolatedNodeValue(norm), 0.0, 1.0, -36.0, 12.0);
+			double db = jmap<double>(env->getTransformedValue(norm), 0.0, 1.0, -36.0, 12.0);
 			freq2[i] = freq1[i] * Decibels::decibelsToGain(db);
 		}
 		else

Source/envelope_component.cpp

@@ -53,7 +53,6 @@ void EnvelopeComponent::show_bubble(int x, int y, const envelope_node& node)
 	m_bubble.showAt({ x,y,100,20 }, temp , 5000);
 }
 
-
 void EnvelopeComponent::paint(Graphics& g)
 {
 	if (!EnvelopeUnderlayDraw)
@@ -105,6 +104,20 @@ void EnvelopeComponent::paint(Graphics& g)
 		g.drawLine((float)i, foo_y0, (float)i + 1, foo_y1, linethickness);
 		y0 = y1;
 	}
+	if (m_envelope->isTransformed())
+	{
+		g.setColour(Colours::aliceblue.darker());
+		y0 = m_envelope->getTransformedValue(0.0);
+		for (int i = 1; i < getWidth(); ++i)
+		{
+			double env_x = 1.0 / getWidth()*i;
+			double y1 = m_envelope->getTransformedValue(env_x);
+			double foo_y0 = (double)getHeight() - jmap<double>(y0, m_view_start_value, m_view_end_value, 0.0, getHeight());
+			double foo_y1 = (double)getHeight() - jmap<double>(y1, m_view_start_value, m_view_end_value, 0.0, getHeight());
+			g.drawLine((float)i, foo_y0, (float)i + 1, foo_y1, linethickness);
+			y0 = y1;
+		}
+	}
 	for (int i = 0; i < m_envelope->GetNumNodes(); ++i)
 	{
 		const envelope_node& pt = m_envelope->GetNodeAtIndex(i);
@@ -298,7 +311,19 @@ void EnvelopeComponent::mouseUp(const MouseEvent &ev)
 
 bool EnvelopeComponent::keyPressed(const KeyPress & ev)
 {
-	if (ev == KeyPress::deleteKey && m_envelope!=nullptr)
+	if (m_envelope == nullptr)
+		return false;
+	if (ev == 'Q')
+		m_envelope->m_transform_x_shift -= 0.01;
+	if (ev == 'W')
+		m_envelope->m_transform_x_shift += 0.01;
+	if (ev == 'E')
+		m_envelope->m_transform_y_shift += 0.01;
+	if (ev == 'D')
+		m_envelope->m_transform_y_shift -= 0.01;
+	repaint();
+
+	if (ev == KeyPress::deleteKey)
 	{
 		m_node_to_drag = -1;
 		//m_envelope->ClearAllNodes();

Source/jcdp_envelope.h

@@ -559,6 +559,21 @@ public:
 		
 	}
 	String m_script;
+	double m_transform_x_shift = 0.0;
+	double m_transform_y_shift = 0.0;
+	inline double getTransformedValue(double x)
+	{
+		if (isTransformed() == false)
+			return x;
+		double temp = fmod(x - m_transform_x_shift, 1.0);
+		if (temp < 0.0)
+			temp += 1.0;
+		return jlimit(0.0,1.0,GetInterpolatedNodeValue(temp) + m_transform_y_shift);
+	}
+	bool isTransformed() const
+	{
+		return m_transform_x_shift != 0.0 || m_transform_y_shift != 0.0;
+	}
 private:
     nodes_t m_nodes;
     double m_playoffset=0.0;