1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
'use strict';
// Each test is an array of [endpoint, midpoint, endpoint] and tests
// whether the endpoints interpolate to the same visual state as the midpoint
const transformTests = {
translate: [
['translateX(0px)', 'translateX(25px)', 'translateX(50px)'],
['translateY(0px)', 'translateY(25px)', 'translateY(50px)'],
['translateX(0%)', 'translateX(25%)', 'translateX(50%)'],
['translateY(0%)', 'translateY(25%)', 'translateY(50%)'],
['translateX(50%)', 'translate(25%, 25%)', 'translateY(50%)'],
['translateX(50%)', 'translate(25%, 25px)', 'translateY(50px)'],
['translateX(50px)', 'translateX(calc(25px + 25%))', 'translateX(50%)']
],
translateEm: [
['translateX(0em)', 'translateX(2em)', 'translateX(4em)'],
['translateX(-50px)', 'translateX(calc(2em - 25px))', 'translateX(4em)'],
['translateX(50%)', 'translateX(calc(25% - 2em))', 'translateX(-4em)']
],
rotate: [
// Rotation about named-axis.
['rotate(30deg)', 'rotate(60deg)', 'rotate(90deg)'],
['rotateX(30deg)', 'rotateX(60deg)', 'rotateX(90deg)'],
['rotateY(30deg)', 'rotateY(60deg)', 'rotateY(90deg)'],
['rotate(30deg)', 'rotate(60deg)', 'rotateZ(90deg)'],
['rotate(0deg)', 'rotate(180deg)', 'rotate(360deg)'],
// Common axis rotations.
['rotate3d(7, 8, 9, 0deg)', 'rotate3d(7, 8, 9, 45deg)', 'rotate3d(7, 8, 9, 90deg)'],
['rotate3d(1, 2, 3, 0deg)', 'rotate3d(3, 6, 9, 45deg)', 'rotate3d(2, 4, 6, 90deg)'],
// Axis is arbitrary if angle is zero. Use non-zero rotation to determine
// the rotation axis.
['rotateX(0deg)', 'rotate(45deg)', 'rotate(90deg)'],
['rotateX(90deg)', 'rotateX(45deg)', 'rotate(0deg)']
],
rotateSlerp: [
// First endpoint is the same rotation as rotateZ(0deg) but triggers SLERP
['rotateX(360deg)', 'rotateZ(45deg)', 'rotateZ(90deg)'],
// Interpolation with inverse. Second case is a common-axis case, but
// included here to group it with its equivalent SLERP test.
['rotate(45deg)', 'rotate(0deg)', 'rotate3d(0, 0, -1, 45deg)'],
['rotate(45deg)', 'rotate(0deg)', 'rotate(-45deg)'],
// Interpolate axis and angle of rotation.
// 70.5288deg = acos(1/3).
['rotateX(90deg)', 'rotate3d(1, 1, 0, 70.5288deg)', 'rotateY(90deg)'],
// Not nice analytical solution for this last one.
// (1, 1, 0, 90deg) --> (x, y, z, w) = (1/2, 1/2, 0, 1/root2)
// (0, 1, 1, 180deg) --> (x, y, z, w) = (0, 1/root2, 1/root2, 0)
// Trace of the "to" transformation matrix is -1. Requires special handling
// to ensure correctness of the quaternion.
// SLERP @0.5: (x, y, z, w) = (0.30389062997686395,
// 0.7336568918027127,
// 0.4297662618258487,
// 0.4297662618258487)
// --> rotate3d(0.3365568, 0.8125199, 0.4759632, 129.094547486deg)
['rotate3d(1, 1, 0, 90deg)',
'rotate3d(0.3365568, 0.8125199, 0.4759632, 129.094547486deg)',
'rotate3d(0, 1, 1, 180deg)'],
],
scale: [
['scaleX(0.5)', 'scaleX(0.75)', 'scaleX(1)'],
['scaleY(0.5)', 'scaleY(0.75)', 'scaleY(1)'],
['scale(0.5)', 'scale(0.75)', 'scale(1)'],
['scaleX(0.5)', 'scale(0.75)', 'scaleY(0.5)'],
['scale3d(0.5, 1, 2)', 'scale3d(0.75, 0.75, 3)', 'scale3d(1, 0.5, 4)']
],
skew: [
['skewX(0deg)', 'skewX(30deg)', 'skewX(60deg)'],
['skewY(0deg)', 'skewY(30deg)', 'skewY(60deg)'],
['skew(60deg, 0deg)', 'skew(30deg, 30deg)', 'skew(0deg, 60deg)'],
['skewX(0deg) rotate(0deg)', 'skewX(0deg) rotate(180deg)', 'skewX(0deg) rotate(360deg)'],
['skewX(0deg) rotate(0deg)', 'matrix(1, 0, 0, 1, 0, 0)', 'skewY(0deg) rotate(360deg)']
],
matrix: [
// matched matrix parameters do not collapse the values after them
['matrix(1,0,0,1,0,0) rotate(0deg)', 'matrix(1.5,0,0,1.5,0,0) rotate(180deg)', 'matrix(2,0,0,2,0,0) rotate(360deg)']
],
perspective: [
// Since perspective doesn't do anything on its own, we need to
// combine it with a transform that does.
['perspective(none) translateZ(15px)', 'perspective(none) translateZ(15px)', 'perspective(none) translateZ(15px)'],
['perspective(100px) translateZ(50px)', 'perspective(200px) translateZ(50px)', 'perspective(none) translateZ(50px)'],
['perspective(none) translateZ(15px)', 'perspective(50px) translateZ(15px)', 'perspective(25px) translateZ(15px)'],
['perspective(100px) translateZ(15px)', 'perspective(40px) translateZ(15px)', 'perspective(25px) translateZ(15px)'],
// Test that perspective is clamped to 1px.
['perspective(0.1px) translateZ(0.25px)', 'perspective(1px) translateZ(0.25px)', 'perspective(0.1px) translateZ(0.25px)'],
['perspective(0px) translateZ(0.25px)', 'perspective(1px) translateZ(0.25px)', 'perspective(0px) translateZ(0.25px)'],
['perspective(0px) translateZ(0.5px)', 'perspective(1.5px) translateZ(0.5px)', 'perspective(3px) translateZ(0.5px)'],
{ test: ['perspective(10px) translateZ(0.5px)', 'translateZ(0.5px)', 'perspective(1px) translateZ(0.5px)'], midpoint: -1 },
{ test: ['perspective(1px) translateZ(0.5px)', 'perspective(1px) translateZ(0.5px)', 'perspective(10px) translateZ(0.5px)'], midpoint: -1 }
]
};
// Initial setup, which includes properties that will be overridden to
// test invalidation.
function initialStyle(div) {
div.style.width = '180px';
div.style.height = '150px';
div.style.margin = '50px';
div.style.borderLeft = 'solid 40px blue';
div.style.backgroundColor = 'green';
div.style.willChange = 'transform';
div.style.fontSize = '30px';
}
function finalStyle(div) {
div.style.width = '80px';
div.style.height = '80px';
div.style.fontSize = '15px';
}
function styleBody(){
let body = document.body;
body.style.display = 'flex';
body.style.flexDirection = 'row';
body.style.flexWrap = 'wrap';
}
// Simulate a static image at 50% progress with a running animation.
// The easing curve has zero slope and curvature at its midpoint of 50% -> 50%.
// The timing values are chosen so as so that a delay of up to 10s will not
// cause a visual change.
const duration = 1e9;
const midpointOptions = {
easing: 'cubic-bezier(0,1,1,0)',
duration: duration,
delay: -duration/2
};
// Similar to midpointOptions, but to produce the interpolation result
// at -1 instead of the interpolation result at 0.5. This easing curve
// has zero slope at its midpoint of -100% (though does have curvature).
const negoneOptions = {
easing: 'cubic-bezier(0,-1,1,-2)',
duration: duration,
delay: -duration/2
};
// Indices to unpack a test case, which is in the format
// [start, midpoint, end]
const startIndex = 0;
const midIndex = 1;
const endIndex = 2;
async function createTests(tests) {
styleBody();
for (const obj of tests) {
let test = ("test" in obj) ? obj.test : obj;
let midpoint = ("midpoint" in obj) ? obj.midpoint : 0.5;
let options;
if (midpoint == 0.5) {
options = midpointOptions;
} else if (midpoint == -1) {
options = negoneOptions;
} else {
document.appendChild(document.createTextNode("unexpected midpoint " + midpoint));
}
let div = document.createElement('div');
document.body.appendChild(div);
initialStyle(div);
var anim =
div.animate({transform: [test[startIndex], test[endIndex]]}, options);
await anim.ready;
finalStyle(div); // Change size to test invalidation.
}
await new Promise(requestAnimationFrame);
await new Promise(requestAnimationFrame);
takeScreenshot();
}
// Create references using an animation with identical keyframes for start
// and end so as to avoid rounding and anti-aliasing differences between
// animated and non-animated pathways.
async function createRefs(tests) {
styleBody();
for (const obj of tests) {
let test = ("test" in obj) ? obj.test : obj;
let div = document.createElement('div');
document.body.appendChild(div);
initialStyle(div);
finalStyle(div);
var anim = div.animate(
{transform: [test[midIndex], test[midIndex]]},
midpointOptions);
await anim.ready;
}
await new Promise(requestAnimationFrame);
await new Promise(requestAnimationFrame);
takeScreenshot();
}
|
