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Allow cubic bezier to accept value outside [0,1] #481

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merged 2 commits into from
Aug 2, 2016
Merged

Allow cubic bezier to accept value outside [0,1] #481

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0a17c54
Allow cubic bezier to accept value outside [0,1]
suzyh Jul 29, 2016
36b96e2
Use gradient to extrapolate instead of linear fn
suzyh Jul 29, 2016
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18 changes: 16 additions & 2 deletions src/timing-utilities.js
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Original file line number Diff line number Diff line change
Expand Up @@ -174,9 +174,23 @@
return linear;
}
return function(x) {
if (x == 0 || x == 1) {
return x;
if (x <= 0) {
var start_gradient = 0;
if (a > 0)
start_gradient = b / a;
else if (!b && c > 0)
start_gradient = d / c;
return start_gradient * x;
}
if (x >= 1) {
var end_gradient = 0;
if (c < 1)
end_gradient = (d - 1) / (c - 1);
else if (c == 1 && a < 1)
end_gradient = (b - 1) / (a - 1);
return 1 + end_gradient * (x - 1);
}

var start = 0, end = 1;
while (start < end) {
var mid = (start + end) / 2;
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13 changes: 2 additions & 11 deletions test/web-platform-tests-expectations.js
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Expand Up @@ -839,23 +839,14 @@ module.exports = {
},

'test/web-platform-tests/web-animations/interfaces/KeyframeEffect/effect-easing.html': {
'effect easing produces values greater than 1 with keyframe easing cubic-bezier(0, 0, 0, 0)':
'assert_approx_equals: The left of the animation should be approximately 102.40666638411385 at 250ms expected 102.40666638411385 +/- 0.01 but got 100',

'effect easing produces values greater than 1 with keyframe easing cubic-bezier(1, 1, 1, 1)':
'assert_approx_equals: The left of the animation should be approximately 102.40666638411385 at 250ms expected 102.40666638411385 +/- 0.01 but got 100',

'effect easing produces negative values 1 with keyframe easing cubic-bezier(0, 0, 0, 0)':
'assert_approx_equals: The left of the animation should be approximately -29.501119758965654 at 250ms expected -29.501119758965654 +/- 0.01 but got 0',

'effect easing produces negative values 1 with keyframe easing cubic-bezier(1, 1, 1, 1)':
'assert_approx_equals: The left of the animation should be approximately -29.501119758965654 at 250ms expected -29.501119758965654 +/- 0.01 but got 0',

'effect easing produces values greater than 1 with keyframe easing producing values greater than 1':
'assert_approx_equals: The left of the animation should be approximately 101.9006796334848 at 240ms expected 101.9006796334848 +/- 0.01 but got 100',

'effect easing produces negative values with keyframe easing producing negative values':
'assert_approx_equals: The left of the animation should be approximately -16.589193103032184 at 10ms expected -16.589193103032184 +/- 0.01 but got 0',
'effect easing which produces values greater than 1 and the tangent on the upper boundary is infinity with keyframe easing producing values greater than 1':
'assert_approx_equals: The left of the animation should be approximately 100 at 240ms expected 100 +/- 0.01 but got 99.5333',
},

'test/web-platform-tests/web-animations/interfaces/KeyframeEffect/effect-easing-steps.html': {
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