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Fix normalization functions

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We need to *subtract*, not *add* the minimum to determine the
range-effective value. For example: if (min, current, max) is
(100, 100, 1000) then the normalized value would be 0.0, not 0.2.

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Jason Gerecke 2014-10-08 14:53:21 -07:00 • committed by Peter Hutterer
parent cd5c9dce3b
commit 297cbe4808
1 changed files with 2 additions and 2 deletions
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4
src/evdev-tablet.c
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@ -106,7 +106,7 @@ tablet_update_tool(struct tablet_dispatch *tablet,
static inline double static inline double
normalize_pressure_or_dist(const struct input_absinfo * absinfo) { normalize_pressure_or_dist(const struct input_absinfo * absinfo) {
double range = absinfo->maximum - absinfo->minimum + 1; double range = absinfo->maximum - absinfo->minimum + 1;
double value = (absinfo->value + absinfo->minimum) / range; double value = (absinfo->value - absinfo->minimum) / range;
return value; return value;
} }
@ -114,7 +114,7 @@ normalize_pressure_or_dist(const struct input_absinfo * absinfo) {
static inline double static inline double
normalize_tilt(const struct input_absinfo * absinfo) { normalize_tilt(const struct input_absinfo * absinfo) {
double range = absinfo->maximum - absinfo->minimum + 1; double range = absinfo->maximum - absinfo->minimum + 1;
double value = (absinfo->value + absinfo->minimum) / range; double value = (absinfo->value - absinfo->minimum) / range;
/* Map to the (-1, 1) range */ /* Map to the (-1, 1) range */
return (value * 2) - 1; return (value * 2) - 1;