scrollbar-fractions.md

Clean Fractions from VScrollBar and HScrollBar Positions

Default Values

• vScrollBar1.Minimum = 0
• vScrollBar1.Maximum = 100
• vScrollBar1.LargeChange is 10
• vScrollBar1.SmallChange is 1

With these values

• Minimum vScrollBar1.Value is 0
• Maximum vScrollBar1.Value is 91 (!!!)

The maximum is:

vScrollBar1.Maximum - vScrollBar1.LargeChange + 1

The fractional position (from 0.0 to 1.0) is therefore:

double frac = 1-((double)vScrollBar1.Value) / (vScrollBar1.Maximum - vScrollBar1.LargeChange + 1);

If considering the "slider" as a window with thickness, the top and the bottom are:

double frac_upper = 1-((double)(vScrollBar1.Value)) / vScrollBar1.Maximum;
double frac_lower = 1-((double)(vScrollBar1.Value + vScrollBar1.LargeChange - 1)) / vScrollBar1.Maximum;