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[css-color-5] Adjustments to edge cases and set notation for hue interpolation types #5278

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Merged
merged 2 commits into from
Jul 15, 2020
Merged

[css-color-5] Adjustments to edge cases and set notation for hue interpolation types #5278

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[css-color-5] Adjustments to edge cases and set notation for hue inte…
dbaron Jul 1, 2020
09236c1
[to merge into previous commit] Address review comments from @LeaVero…
dbaron Jul 8, 2020
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16 changes: 8 additions & 8 deletions css-color-5/Overview.bs
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Expand Up @@ -752,37 +752,37 @@ Unless the type of hue interpolation is ''specified'', both angles need to be co
One way to do this is <code><i>θ</i> = ((<i>θ</i> % 360) + 360) % 360</code>.

: ''shorter''
:: Angles are adjusted so that θ₂ - θ₁ ∈ [0, 180). In pseudo-Javascript:
:: Angles are adjusted so that θ₂ - θ₁ ∈ [-180, 180]. In pseudo-Javascript:
<pre>
if (θ₂ - θ₁ >= 180) {
if (θ₂ - θ₁ > 180) {
θ₁ += 360;
}
else if (θ₂ - θ₁ <= -180) {
else if (θ₂ - θ₁ < -180) {
θ₂ += 360;
}
</pre>

: ''longer''
:: Angles are adjusted so that θ₂ - θ₁ ∈ [180, 360). In pseudo-Javascript:
:: Angles are adjusted so that |θ₂ - θ₁| ∈ {0, [180, 360)}. In pseudo-Javascript:
<pre>
if (0 < θ₂ - θ₁ < 180) {
θ₁ += 360;
θ₁ += 360;
}
else if (-180 < θ₂ - θ₁ < 0) {
θ₂ += 360;
θ₂ += 360;
}
</pre>

: ''increasing''
:: Angles are adjusted so that θ₂ - θ₁ ∈ [0, 360) and θ₁ ≤ θ₂. In pseudo-Javascript:
:: Angles are adjusted so that θ₂ - θ₁ ∈ [0, 360). In pseudo-Javascript:
<pre>
if (θ₂ < θ₁) {
θ₂ += 360;
}
</pre>

: ''decreasing''
:: Angles are adjusted so that θ₂ - θ₁ ∈ [0, 360) and θ₁ ≥ θ₂. In pseudo-Javascript:
:: Angles are adjusted so that θ₂ - θ₁ ∈ (-360, 0]. In pseudo-Javascript:
<pre>
if (θ₁ < θ₂) {
θ₁ += 360;
Expand Down