Sticky items for set range
This commit is contained in:
Ruben van de Ven
parent
a15195237d
commit
c4b7c28ca6
70
canvas.html
70
canvas.html
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@ -46,6 +46,7 @@
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.anchor {
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cursor: pointer;
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/* TODO investigate scroll-snap-align: center; having scroll-snap-type: y proximity; on html*/
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}
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/*Filenames with code blocks: https://stackoverflow.com/a/58199362*/
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@ -87,38 +88,40 @@
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background-color: rgba(255, 255, 255, 0.8);
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}
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.anchor{
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.anchor {
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position: relative;
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}
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.anchor.active:not(.playing)::before{
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content:'⏵';
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.anchor.active:not(.playing)::before {
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content: '⏵';
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position: absolute;
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width: 40px;
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height: 40px;
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background:gray;
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background: gray;
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left: calc(50% - 20px);
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top: calc(50% - 20px);
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vertical-align: middle;
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line-height: 35px;
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border-radius: 5px;
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color:white;
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color: white;
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}
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.anchor.active:not(.playing):hover::before{
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background:black
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.anchor.active:not(.playing):hover::before {
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background: black
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}
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.anchor.playing:hover::before{
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content:'⏸︎';
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.anchor.playing:hover::before {
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content: '⏸︎';
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position: absolute;
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width: 40px;
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height: 40px;
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background:black;
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background: black;
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left: calc(50% - 20px);
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top: calc(50% - 20px);
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vertical-align: middle;
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line-height: 35px;
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border-radius: 5px;
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color:white;
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color: white;
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}
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</style>
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<link rel="stylesheet" href="paper.css" />
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@ -152,6 +155,10 @@
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div.controls{display:none !important;}`
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);
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function easeInOutSine(x) {
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return -(Math.cos(Math.PI * x) - 1) / 2;
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}
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function easeInOutQuart(x) {
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return x < 0.5 ? 8 * x * x * x * x : 1 - Math.pow(-2 * x + 2, 4) / 2;
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@ -224,6 +231,10 @@
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prev = offset
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}
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const sticky_dy = 200;
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const intro_outro_dy = window.innerHeight + sticky_dy;
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let source_pos, target_pos, source_scale, target_scale, source_color, target_color, source_x_offset, target_x_offset;
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const x_column_width = window.innerWidth - document.body.getBoundingClientRect().width + 200; // for some reason the 200 is neccesary
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@ -232,8 +243,11 @@
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const fit_scale = x_column_width / (canvasCenter[0] * 1.7)
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let sticky_start = true;
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let sticky_end = true;
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if (prev === null) {
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prev = [next[0] - window.innerHeight / 2, null]
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prev = [next[0] - intro_outro_dy, null]
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source_scale = fit_scale
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target_scale = .45
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@ -246,8 +260,10 @@
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source_x_offset = x_center_map;
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target_x_offset = x_center_column;
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sticky_start = false; // no sticky before first item
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} else if (next === null) {
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next = [prev[0] + window.innerHeight / 2, null]
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next = [prev[0] + intro_outro_dy, null]
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source_scale = .45
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target_scale = fit_scale
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@ -260,6 +276,8 @@
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source_x_offset = x_center_column;
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target_x_offset = x_center_map;
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sticky_end = false; // no sticky after last item
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} else {
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source_pos = centerPoints[prev[1]]
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target_pos = centerPoints[next[1]]
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@ -273,9 +291,25 @@
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}
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const t = Math.min(1, Math.max(0, (center_y - prev[0]) / (next[0] - prev[0])))
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t_ease = easeInOutQuart(t)
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// t_ease = easeInOutBack(t)
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const t_old = Math.min(1, Math.max(0, (center_y - prev[0]) / (next[0] - prev[0])))
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const s = (center_y - prev[0] - (sticky_dy * sticky_start)) / (next[0] - prev[0] - (sticky_start + sticky_end) * sticky_dy);
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const t = Math.min(1, Math.max(0, s))
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// console.log(t_old, t)
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t_ease = easeInOutSine(t)
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// t_ease = easeInOutQuart(t) // use this if not snapping
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let sticky_offset = 0;
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if (s > 0 && s < 1) {
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// scrolling from one item to the next
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sticky_offset = t_ease * (sticky_start + sticky_end) * sticky_dy - (sticky_dy * sticky_start);
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} else {
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// sticky item
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if (sticky_end && center_y > next[0] - sticky_dy) {
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sticky_offset = sticky_dy - (center_y - next[0] + sticky_dy)
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} else if (sticky_start && s <= 0) {
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sticky_offset = ((center_y - prev[0]) / sticky_dy) * (- sticky_dy);
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}
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}
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const dx = target_pos[0] - source_pos[0];
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const dy = target_pos[1] - source_pos[1];
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@ -288,7 +322,7 @@
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scale = source_scale + t_ease * ds;
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x_offset = (target_x_offset - source_x_offset) * t_ease + source_x_offset
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x = -1 * (source_pos[0] + dx * t_ease) * scale + x_offset;
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y = -1 * (source_pos[1] + dy * t_ease) * scale + window.innerHeight / 2;
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y = -1 * (source_pos[1] + dy * t_ease) * scale + window.innerHeight / 2 + sticky_offset;
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const color = (target_color - source_color) * t_ease + source_color
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// sheet.rules[0].style.setProperty('--override-color', `rgba(${color},${color},${color},0.7)`);
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@ -350,7 +384,7 @@
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let options = {
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// root: document.querySelector("#scrollArea"), // viewport by default
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rootMargin: `${-Math.floor((window.innerHeight-10) / 2)}px 0px`, //"0px",
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rootMargin: `${-Math.floor((window.innerHeight - 10) / 2)}px 0px`, //"0px",
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threshold: 0,
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};
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