scale_direct
return scale_direct(sampleX[x], sampleY[y], area);
return scale_direct(sampleX[x1], sampleX[x2], sampleY[y1], sampleY[y2],
return scale_direct(kPositionalX[x], kPositionalY[y], area);
return scale_direct(kPositionalX[x1], kPositionalX[x2],