void GraphData::render( ImageObject& img, const Rect& r )
{
int pixel = 0;
int old_pixel = 0;
for(int i = 0; i < values-1; i++)
{
if(pInterpolation == GRAPH_INTERPOLATION_NONE)
{
img.putPixel(data_pixels[i][0], (int)getValue(i, 1), lineColor);
}
else
{
int spacing = (data_pixels[i+1][0]-data_pixels[i][0]);
for(int i2 = 0; i2 < spacing; i2++)
{
float pos = ((float)i2/(float)(data_pixels[i+1][0]-data_pixels[i][0]));
//TODO: Select interpolation type
if(pInterpolation == GRAPH_INTERPOLATION_SPLINE)
{
pixel = (int)splineInterpolation(pos, getValue(i-2,1), getValue(i-1, 1), getValue(i, 1), getValue(i+1, 1), getValue(i+2, 1), getValue(i+3, 1));
}
else if(pInterpolation == GRAPH_INTERPOLATION_CUBIC)
{
pixel = (int)linearInterpolation(pos, getValue(i, 1), getValue(i+1, 1)) + 10;
}
else
{
pixel = (int)linearInterpolation(pos, getValue(i, 1), getValue(i+1, 1));
}
// Going up
if(pixel > old_pixel)
{
for(int apa = abs(pixel-old_pixel); apa >= 0; apa--)
{
img.putPixel(data_pixels[i][0]+i2, pixel-apa, lineColor);
}
}
// Going down
else if(old_pixel > pixel)
{
for(int apa = abs(pixel-old_pixel); apa >= 0; apa--)
{
img.putPixel(data_pixels[i][0]+i2, pixel+apa-1, lineColor);
}
}
// Same value as previous sample
else
{
img.putPixel(data_pixels[i][0]+i2, pixel, lineColor);
img.putPixel(data_pixels[i][0]+i2, pixel-1, lineColor);
}
old_pixel = pixel;
}
}
}
}
