/**
* Updates the preview points (if necessary)
*
*/
void EFX::updatePreview()
{
if (m_previewPointArray == NULL)
return;
int stepCount = 128;
int step = 0;
float stepSize = (float)(1) / ((float)(stepCount) / (M_PI * 2.0));
float i = 0;
float *x = new float;
float *y = new float;
/* Resize the array to contain stepCount points */
m_previewPointArray->resize(stepCount);
if (m_algorithm == KCircleAlgorithmName)
{
/* Draw a preview of a circle */
for (i = 0; i < (M_PI * 2.0); i += stepSize)
{
circlePoint(this, i, x, y);
m_previewPointArray->setPoint(step++,
static_cast<int> (*x),
static_cast<int> (*y));
}
}
else if (m_algorithm == KEightAlgorithmName)
{
/* Draw a preview of a eight */
for (i = 0; i < (M_PI * 2.0); i += stepSize)
{
eightPoint(this, i, x, y);
m_previewPointArray->setPoint(step++,
static_cast<int> (*x),
static_cast<int> (*y));
}
}
else if (m_algorithm == KLineAlgorithmName)
{
/* Draw a preview of a line */
for (i = 0; i < (M_PI * 2.0); i += stepSize)
{
linePoint(this, i, x, y);
m_previewPointArray->setPoint(step++,
static_cast<int> (*x),
static_cast<int> (*y));
}
}
else if (m_algorithm == KDiamondAlgorithmName)
{
/* Draw a preview of a diamond */
for (i = 0; i < (M_PI * 2.0); i += stepSize)
{
diamondPoint(this, i, x, y);
m_previewPointArray->setPoint(step++,
static_cast<int> (*x),
static_cast<int> (*y));
}
}
else if (m_algorithm == KTriangleAlgorithmName)
{
/* Draw a preview of a triangle */
for (i = 0; i < (M_PI * 2.0); i += stepSize)
{
trianglePoint(this, i, x, y);
m_previewPointArray->setPoint(step++,
static_cast<int> (*x),
static_cast<int> (*y));
}
}
else if (m_algorithm == KLissajousAlgorithmName)
{
/* Draw a preview of a lissajous */
for (i = 0; i < (M_PI * 2.0); i += stepSize)
{
lissajousPoint(this, i, x, y);
m_previewPointArray->setPoint(step++,
static_cast<int> (*x),
static_cast<int> (*y));
}
}
else
{
m_previewPointArray->resize(0);
}
delete x;
delete y;
}
bool EFX::preview(QVector <QPoint>& polygon)
{
bool retval = true;
int stepCount = 128;
int step = 0;
qreal stepSize = (qreal)(1) / ((qreal)(stepCount) / (M_PI * 2.0));
qreal i = 0;
qreal x = 0;
qreal y = 0;
/* Resize the array to contain stepCount points */
polygon.resize(stepCount);
/* Since algorithm is identified by a string, we don't want to do N
string comparisons on each for loop increment. So, it's a bit faster
to check the algorithm only once and then do the looping. */
if (m_algorithm == KCircleAlgorithmName)
{
/* Draw a preview of a circle */
for (step = 0; step < stepCount; step++)
{
circlePoint(this, i, &x, &y);
polygon[step] = QPoint(int(x), int(y));
i += stepSize;
}
}
else if (m_algorithm == KEightAlgorithmName)
{
/* Draw a preview of a eight */
for (step = 0; step < stepCount; step++)
{
eightPoint(this, i, &x, &y);
polygon[step] = QPoint(int(x), int(y));
i += stepSize;
}
}
else if (m_algorithm == KLineAlgorithmName)
{
/* Draw a preview of a line */
for (step = 0; step < stepCount; step++)
{
linePoint(this, i, &x, &y);
polygon[step] = QPoint(int(x), int(y));
i += stepSize;
}
}
else if (m_algorithm == KDiamondAlgorithmName)
{
/* Draw a preview of a diamond */
for (step = 0; step < stepCount; step++)
{
diamondPoint(this, i, &x, &y);
polygon[step] = QPoint(int(x), int(y));
i += stepSize;
}
}
else if (m_algorithm == KTriangleAlgorithmName)
{
/* Draw a preview of a triangle */
for (step = 0; step < stepCount; step++)
{
trianglePoint(this, i, &x, &y);
polygon[step] = QPoint(int(x), int(y));
i += stepSize;
}
}
else if (m_algorithm == KLissajousAlgorithmName)
{
/* Draw a preview of a lissajous */
for (step = 0; step < stepCount; step++)
{
lissajousPoint(this, i, &x, &y);
polygon[step] = QPoint(int(x), int(y));
i += stepSize;
}
}
else
{
polygon.resize(0);
retval = false;
}
return retval;
}