Starting Pixel Adjustments
Start all coordinates relative to Pixel centers. Adjust Y downward, X to left.
Yc = Ymin - 0.5 = 15.9602 - 0.5 = 15.4602
Xc = Xmin + 0.5 = 114.339 + 0.5 = 114.839
Pick nearest scan line inside Vmin_y
Ystart = ceiling (Yc) = 16
adjY = Ystart - Yc = 16 - 15.46 = 0.54
Adjust X value for Y start:
Xstart left = Xc + adjY * dxdy_Emaj = 114.839 + 0.54 * 0.685 = 115.2
Xstart right = 114.839 + adY * dxdy_Ebot = 114.839 + 0.54*4.26 = 117.1