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particle/ramp: don't use floating point arithmetic

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Daniel Eklöf 2018-12-26 12:44:26 +01:00
parent 1929099ca4
commit 052513c736
1 changed files with 10 additions and 2 deletions
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12
particles/ramp.c
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@ -33,13 +33,21 @@ instantiate(const struct particle *particle, const struct tag_set *tags)
const struct tag *tag = tag_for_name(tags, ramp->tag);
assert(tag != NULL);
assert(ramp->count > 0);
long value = tag->as_int(tag);
long min = tag->min(tag);
long max = tag->max(tag);
double progress = (double)value / (max - min);
assert(value >= min && value <= max);
assert(max >= min);
size_t idx = progress * ramp->count;
size_t idx = 0;
if (max - min > 0)
idx = ramp->count * value / (max - min);
if (idx == ramp->count)
idx--;
/*
* printf("ramp: value: %lu, min: %lu, max: %lu, progress: %f, idx: %zu\n",
* value, min, max, progress, idx);