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Added ability to pass different count of colors to gradients.

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This commit is contained in:
23rd 2020-12-16 10:31:55 +03:00
parent 967b18290c
commit dd4ddd69fd
1 changed files with 56 additions and 6 deletions
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62
ui/effects/gradient.h
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@ -71,14 +71,64 @@ public:
Assert(gradient1 != end(_gradients));
Assert(gradient2 != end(_gradients));
const auto stops1 = gradient1->second.stops();
const auto stops2 = gradient2->second.stops();
const auto stopsFrom = gradient1->second.stops();
const auto stopsTo = gradient2->second.stops();
const auto size = stops1.size();
if ((stopsFrom.size() == stopsTo.size())
&& ranges::equal(
stopsFrom,
stopsTo,
ranges::equal_to(),
&QGradientStop::first,
&QGradientStop::first)) {
for (auto i = 0; i < size; i++) {
auto c = color(stops1[i].second, stops2[i].second, b_ratio);
gradient.setColorAt(i / (size - 1), std::move(c));
const auto size = stopsFrom.size();
const auto &p = b_ratio;
for (auto i = 0; i < size; i++) {
auto c = color(stopsFrom[i].second, stopsTo[i].second, p);
gradient.setColorAt(stopsTo[i].first, std::move(c));
}
return gradient;
}
const auto invert = (stopsFrom.size() > stopsTo.size());
if (invert) {
b_ratio = 1. - b_ratio;
}
const auto &stops1 = invert ? stopsTo : stopsFrom;
const auto &stops2 = invert ? stopsFrom : stopsTo;
const auto size1 = stops1.size();
const auto size2 = stops2.size();
for (auto i = 0; i < size1; i++) {
const auto point1 = stops1[i].first;
const auto previousPoint1 = i ? stops1[i - 1].first : -1.;
for (auto n = 0; n < size2; n++) {
const auto point2 = stops2[n].first;
if ((point2 <= previousPoint1) || (point2 > point1)) {
continue;
}
const auto color2 = stops2[n].second;
QColor result;
if (point2 < point1) {
const auto pointRatio2 = (point2 - previousPoint1)
/ (point1 - previousPoint1);
const auto color1 = color(
stops1[i - 1].second,
stops1[i].second,
pointRatio2);
result = color(color1, color2, b_ratio);
} else {
// point2 == point1
result = color(stops1[i].second, color2, b_ratio);
}
gradient.setColorAt(point2, std::move(result));
}
}
return gradient;
}