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add image cache function

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Spedon
2023-03-14 23:31:02 +08:00
parent d5a280a98a
commit 37d62f85fb
2 changed files with 20 additions and 0 deletions
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18
assets/ts/imageCache.ts Normal file
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@@ -0,0 +1,18 @@
import { imagesArray, imagesArrayLen } from './dataFetch'
import { preloadImage, calcImageIndex } from './utils'
let lastIndex: number = 0
export function preloader(index: number): void {
if (lastIndex === index) {
for (let i: number = -2; i <= 1; i++)
preloadImage(imagesArray[calcImageIndex(index + i, imagesArrayLen)].url)
} else if (lastIndex > index) {
for (let i: number = 1; i <= 3; i++)
preloadImage(imagesArray[calcImageIndex(index - i, imagesArrayLen)].url)
} else {
for (let i: number = 1; i <= 3; i++)
preloadImage(imagesArray[calcImageIndex(index + i, imagesArrayLen)].url)
}
lastIndex = index
}

2
assets/ts/main.ts
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@@ -3,8 +3,10 @@ import { trackMouseInit } from './trackMouse'
import { thresholdCtlInit } from './thresholdCtl'
import { imagesArrayLen } from './dataFetch'
import { vwRefreshInit } from './overlay'
import { preloader } from './imageCache'
function init(): void {
preloader(0)
vwRefreshInit()
imgIndexSpanUpdate(0, imagesArrayLen)
thresholdCtlInit()