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Reduce calls to getStringSize when calculating visible ticks (#2589) #3953

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merged 4 commits into from Nov 12, 2023
Merged

Reduce calls to getStringSize when calculating visible ticks (#2589) #3953

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4b4c776
Reduce calls to `getStringSize` when calculating visible ticks (#2589)
bernardobelchior Nov 12, 2023
561a570
Add unit tests
bernardobelchior Nov 12, 2023
d433d08
Fix bug. Add comment.
bernardobelchior Nov 12, 2023
5f16cf4
Also cache getSize for getEquidistantTicks
bernardobelchior Nov 12, 2023
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2 changes: 1 addition & 1 deletion src/cartesian/getEquidistantTicks.ts
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Expand Up @@ -35,7 +35,7 @@ export function getEquidistantTicks(

const tickCoord = entry.coordinate;
// We will always show the first tick.
const isShow = index === 0 || isVisible(sign, tickCoord, size, start, end);
const isShow = index === 0 || isVisible(sign, tickCoord, () => size, start, end);
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Is the tick size not already computed in line 34?
If I understand correctly, this should be

    // Check if the element collides with the next element
    const getSize = () => getTickSize(entry, index);

    const tickCoord = entry.coordinate;
    // We will always show the first tick.
    const isShow = index === 0 || isVisible(sign, tickCoord, getSize, start, end);

Now we would not call getTickSize directly.

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Doing so triggers the following lint error:

image

But I think I managed to find a workaround. Pushing a new commit 馃槃


if (!isShow) {
// Start all over with a larger stepsize
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33 changes: 24 additions & 9 deletions src/cartesian/getTicks.ts
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Expand Up @@ -24,9 +24,17 @@ function getTicksEnd(

for (let i = len - 1; i >= 0; i--) {
let entry = result[i];
const size = getTickSize(entry, i);
let size: number | undefined;
const getSize = () => {
if (size === undefined) {
size = getTickSize(entry, i);
}

return size;
};
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if (i === len - 1) {
const gap = sign * (entry.coordinate + (sign * size) / 2 - end);
const gap = sign * (entry.coordinate + (sign * getSize()) / 2 - end);
result[i] = entry = {
...entry,
tickCoord: gap > 0 ? entry.coordinate - gap * sign : entry.coordinate,
Expand All @@ -35,10 +43,10 @@ function getTicksEnd(
result[i] = entry = { ...entry, tickCoord: entry.coordinate };
}

const isShow = isVisible(sign, entry.tickCoord, size, start, end);
const isShow = isVisible(sign, entry.tickCoord, getSize, start, end);

if (isShow) {
end = entry.tickCoord - sign * (size / 2 + minTickGap);
end = entry.tickCoord - sign * (getSize() / 2 + minTickGap);
result[i] = { ...entry, isShow: true };
}
}
Expand Down Expand Up @@ -69,7 +77,7 @@ function getTicksStart(
tickCoord: tailGap > 0 ? tail.coordinate - tailGap * sign : tail.coordinate,
};

const isTailShow = isVisible(sign, tail.tickCoord, tailSize, start, end);
const isTailShow = isVisible(sign, tail.tickCoord, () => tailSize, start, end);
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if (isTailShow) {
end = tail.tickCoord - sign * (tailSize / 2 + minTickGap);
Expand All @@ -80,10 +88,17 @@ function getTicksStart(
const count = preserveEnd ? len - 1 : len;
for (let i = 0; i < count; i++) {
let entry = result[i];
const size = getTickSize(entry, i);
let size: number | undefined;
const getSize = () => {
if (size === undefined) {
size = getTickSize(entry, i);
}

return size;
};

if (i === 0) {
const gap = sign * (entry.coordinate - (sign * size) / 2 - start);
const gap = sign * (entry.coordinate - (sign * getSize()) / 2 - start);
result[i] = entry = {
...entry,
tickCoord: gap < 0 ? entry.coordinate - gap * sign : entry.coordinate,
Expand All @@ -92,10 +107,10 @@ function getTicksStart(
result[i] = entry = { ...entry, tickCoord: entry.coordinate };
}

const isShow = isVisible(sign, entry.tickCoord, size, start, end);
const isShow = isVisible(sign, entry.tickCoord, getSize, start, end);

if (isShow) {
start = entry.tickCoord + sign * (size / 2 + minTickGap);
start = entry.tickCoord + sign * (getSize() / 2 + minTickGap);
result[i] = { ...entry, isShow: true };
}
}
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16 changes: 15 additions & 1 deletion src/util/TickUtils.ts
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Expand Up @@ -23,7 +23,21 @@ export function getTickBoundaries(viewBox: CartesianViewBox, sign: number, sizeK
};
}

export function isVisible(sign: number, tickPosition: number, size: number, start: number, end: number): boolean {
export function isVisible(
sign: number,
tickPosition: number,
getSize: () => number,
start: number,
end: number,
): boolean {
/* Since getSize() is expensive (it reads the ticks' size from the DOM), we do this check first to avoid calculating
* the tick's size. */
if (sign * tickPosition < sign * start || sign * tickPosition > sign * end) {
return false;
}
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const size = getSize();

return sign * (tickPosition - (sign * size) / 2 - start) >= 0 && sign * (tickPosition + (sign * size) / 2 - end) <= 0;
}

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28 changes: 28 additions & 0 deletions test/util/TickUtils.spec.ts
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@@ -0,0 +1,28 @@
import { isVisible } from '../../src/util/TickUtils';

describe('isVisible', () => {
test.each([
{ sign: 1, position: 50, size: 10, start: 0, end: 100 },
{ sign: 1, position: 50, size: 50, start: 0, end: 100 },
{ sign: 1, position: 50, size: 100, start: 0, end: 100 },
{ sign: 0, position: 50, size: 10, start: 0, end: 100 },
{ sign: 0, position: 50, size: 50, start: 0, end: 100 },
{ sign: 0, position: 50, size: 100, start: 0, end: 100 },
])('is returns true if tick is inside limits: (%o)', ({ sign, position, size, start, end }) => {
expect(isVisible(sign, position, () => size, start, end)).toBeTruthy();
});

test.each([
{ sign: -1, position: 50, size: 10, start: 0, end: 100 },
{ sign: -1, position: 50, size: 50, start: 0, end: 100 },
{ sign: -1, position: 50, size: 100, start: 0, end: 100 },
{ sign: 1, position: 50, size: 101, start: 0, end: 100 },
{ sign: 1, position: 10, size: 10_000, start: 50, end: 100 },
{ sign: 1, position: 110, size: 10_000, start: 50, end: 100 },
{ sign: -1, position: 50, size: 101, start: 0, end: 100 },
{ sign: -1, position: 10, size: 10_000, start: 50, end: 100 },
{ sign: -1, position: 110, size: 10_000, start: 50, end: 100 },
])('is returns false if tick is outside limits: (%o)', ({ sign, position, size, start, end }) => {
expect(isVisible(sign, position, () => size, start, end)).toBeFalsy();
});
});