void VCurve2DBase::CreateLookup(int iSampleCount, float *pArray, int iValueStride, float fScaling, float fBias)
{
// lookup bezier points
float x = 0.0f; // X-Coordinate of Lookup
float fdx = GetDuration()/(float)(iSampleCount-1); // Step size of x
// Iterate bezier curve and create PointList
VMemoryTempBuffer<512*sizeof(VCurvePoint2D)> buffer(iSampleCount*sizeof(VCurvePoint2D));
VCurvePoint2D *pPoints = (VCurvePoint2D *)buffer.GetBuffer();
for (int i = 0; i < iSampleCount; i++, x += fdx)
pPoints[i] = GetBezierPoint(x);
// Fill lookup table
x = 0.0f;
for (int i = 0; i < iSampleCount; i++, x += fdx)
pArray[i*iValueStride] = GetValue(pPoints, iSampleCount, x)*fScaling + fBias;
}
// ============================================================================
// Draw points and curves
// ============================================================================
void CBezierWnd::Draw()
{
// Draw control point handles and labels
for ( PointSetIt i = m_Points.begin(); i != m_Points.end(); ++i )
{
DrawHandle( *i );
DrawLabel( *i );
}
if ( m_Points.size() < 3)
return;
// Draw curve
PointList lPoints;
for ( PointSetIt i = m_Points.begin(); i != m_Points.end(); ++i )
lPoints.push_back( *i );
CPoint2D p2DStart = *m_Points.begin();
float fStep = 1.f / ( 10.f * ( float ) lPoints.size() );
for ( float i = 0.f; i <= 1.f; i+= fStep )
{
CPoint2D p2D = GetBezierPoint( lPoints, i );
DrawLine( p2DStart, p2D );
p2DStart = p2D;
}
DrawLine( p2DStart, lPoints.back() );
// Draw control polygon
if ( m_bDrawPoly )
{
PointSetIt i = m_Points.begin(), iPrev = i++;
do {
DrawLine( *iPrev, *i );
iPrev = i++;
} while ( i != m_Points.end() );
}
}
