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optimize waterfall color generation

This commit is contained in:
Jakob Ketterl 2020-09-19 21:53:29 +02:00
parent 71a2352d2b
commit c1347de1f0
1 changed files with 11 additions and 9 deletions
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20
htdocs/openwebrx.js
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@ -1214,17 +1214,19 @@ function waterfall_mkcolor(db_value, waterfall_colors_arg) {
waterfall_colors_arg = waterfall_colors_arg || waterfall_colors; waterfall_colors_arg = waterfall_colors_arg || waterfall_colors;
var value_percent = (db_value - waterfall_min_level) / (waterfall_max_level - waterfall_min_level); var value_percent = (db_value - waterfall_min_level) / (waterfall_max_level - waterfall_min_level);
value_percent = Math.max(0, Math.min(1, value_percent)); value_percent = Math.max(0, Math.min(1, value_percent));
var percent_for_one_color = 1 / (waterfall_colors_arg.length - 1);
var index = Math.floor(value_percent / percent_for_one_color); var scaled = value_percent * (waterfall_colors.length - 1);
var remain = (value_percent - percent_for_one_color * index) / percent_for_one_color; var index = Math.floor(scaled);
return color_between(waterfall_colors_arg[index + 1], waterfall_colors_arg[index], remain);} var remain = scaled - index;
if (remain == 0) return waterfall_colors_arg[index];
return color_between(waterfall_colors_arg[index], waterfall_colors_arg[index + 1], remain);}
function color_between(first, second, percent) { function color_between(first, second, percent) {
var output = []; return [
for (var i = 0; i < 3; i++) { first[0] + percent * (second[0] - first[0]),
output[i] = first[i] + percent * (first[i] - second[i]); first[1] + percent * (second[1] - first[1]),
} first[2] + percent * (second[2] - first[2])
return output; ];
} }