인프런 커뮤니티 질문&답변
작성한 질문수
스크롤하이트가 정의되지않았다고 에러뜨는데 왜일까요,,??
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(() => {
let yOffset = 0; // window.pageYOffset 대신 쓸 변수
let prevScrollHeight = 0; // 현재 스크롤 위치 (yOffset) 보다 이전에 위치한 스크롤 섹션들의 스크롤 높이 합
let currentScene = 0; // 현재 활성화 된(눈 앞에 보고 있는) 씬 (scroll-section)
let enterNewScene = false; // 새로운 씬이 시작 된 순간 true
const sceneInfo = [
{
//0
type: 'sticky',
heightNum: 5, //브라우저 높이의 5배로 scrollHeight 세팅
scrollHeight: 0,
objs: {
container: document.querySelector('#scroll-section-0'),
messageA: document.querySelector('#scroll-section-0 .main-message.a'),
messageB: document.querySelector('#scroll-section-0 .main-message.b'),
messageC: document.querySelector('#scroll-section-0 .main-message.c'),
messageD: document.querySelector('#scroll-section-0 .main-message.d'),
canvas: document.querySelector('#video-canvas-0'),
context: document.querySelector('#video-canvas-0').getContext('2d'),
videoImages: []
},
values: {
videoImageCount: 300,
imageSequenc: [0, 299],
canvas_opacity: [1, 0, {start: 0.9, end: 1 }],
messageA_opacity_in: [0, 1, { start: 0.1, end: 0.2 }],
messageB_opacity_in: [0, 1, { start: 0.3, end: 0.4 }],
messageC_opacity_in: [0, 1, { start: 0.5, end: 0.6 }],
messageD_opacity_in: [0, 1, { start: 0.7, end: 0.8 }],
messageA_translateY_in: [20, 0, { start: 0.1, end: 0.2 }],
messageB_translateY_in: [20, 0, { start: 0.3, end: 0.4 }],
messageC_translateY_in: [20, 0, { start: 0.5, end: 0.6 }],
messageD_translateY_in: [20, 0, { start: 0.7, end: 0.8 }],
// 20=> translateY를 20%만큼 조정, %는 밑에 playAnimation()에서 붙여줄 거임
messageA_opacity_out: [1, 0, { start: 0.25, end: 0.3 }],
messageB_opacity_out: [1, 0, { start: 0.45, end: 0.5 }],
messageC_opacity_out: [1, 0, { start: 0.65, end: 0.7 }],
messageD_opacity_out: [1, 0, { start: 0.85, end: 0.9 }],
messageA_translateY_out: [0, -20, { start: 0.25, end: 0.3 }],
messageB_translateY_out: [0, -20, { start: 0.45, end: 0.5 }],
messageC_translateY_out: [0, -20, { start: 0.65, end: 0.7 }],
messageD_translateY_out: [0, -20, { start: 0.85, end: 0.9 }]
}
},
//1
{
type: 'normal',
// heightNum: 5, // type normal에서는 필요없음
scrollHeight: 0,
objs: {
container: document.querySelector('#scroll-section-1')
}
},
//2
{
type: 'sticky',
heightNum: 5, // 브라우저 높이의 5배로 scrollHeight 세팅
scrollHeight: 0,
objs: {
container: document.querySelector('#scroll-section-2'),
messageA: document.querySelector('#scroll-section-2 .a'),
messageB: document.querySelector('#scroll-section-2 .b'),
messageC: document.querySelector('#scroll-section-2 .c'),
pinB: document.querySelector('#scroll-section-2 .b .pin'),
pinC: document.querySelector('#scroll-section-2 .c .pin'),
canvas: document.querySelector('#video-canvas-1'),
context: document.querySelector('#video-canvas-1').getContext('2d'),
videoImages: []
},
values: {
videoImageCount: 960,
imageSequenc: [0, 959],
canvas_opacity: [1, 0, { start: 0.9, end: 1}],
messageA_translateY_in: [20, 0, { start: 0.15, end: 0.2 }],
messageB_translateY_in: [30, 0, { start: 0.6, end: 0.65 }],
messageC_translateY_in: [30, 0, { start: 0.87, end: 0.92 }],
messageA_opacity_in: [0, 1, { start: 0.25, end: 0.3 }],
messageB_opacity_in: [0, 1, { start: 0.6, end: 0.65 }],
messageC_opacity_in: [0, 1, { start: 0.87, end: 0.92 }],
messageA_translateY_out: [0, -20, { start: 0.4, end: 0.45 }],
messageB_translateY_out: [0, -20, { start: 0.68, end: 0.73 }],
messageC_translateY_out: [0, -20, { start: 0.95, end: 1 }],
messageA_opacity_out: [1, 0, { start: 0.4, end: 0.45 }],
messageB_opacity_out: [1, 0, { start: 0.68, end: 0.73 }],
messageC_opacity_out: [1, 0, { start: 0.95, end: 1 }],
pinB_scaleY: [0.5, 1, { start: 0.6, end: 0.65 }],
pinC_scaleY: [0.5, 1, { start: 0.87, end: 0.92 }]
}
},
//3
{
type: 'sticky',
heightNum: 5, // 브라우저 높이의 5배로 scrollHeight 세팅
scrollHeight: 0,
objs: {
container: document.querySelector('#scroll-section-3'),
canvasCaption: document.querySelector('.canvas-caption')
},
values: {
}
}
];
function setCanvasImages() {
let imgElem;
for (let i = 0; i < sceneInfo[0].values.videoImageCount; i++) {
imgElem = new Image();
// imgElem = document.createElement('img');
imgElem.src = `./video/001/IMG_${6726 + i}.JPG`;
sceneInfo[0].objs.videoImages.push(imgElem);
}
let imgElem2;
for (let i = 0; i < sceneInfo[2].values.videoImageCount; i++) {
imgElem2 = new Image();
imgElem2.src = `./video/002/IMG_${7027 + i}.JPG`;
sceneInfo[2].objs.videoImages.push(imgElem2);
}
}
function setLayout() {
// 각 스크롤 섹션의 높이 세팅
for (let i = 0; i < sceneInfo.length; i++) {
if (sceneInfo[i].type === 'sticky') {
sceneInfo[i].scrollHeight = sceneInfo[i].heightNum * window.innerHeight;
} else if (sceneInfo[i].type === 'normal') {
sceneInfo[i].scrollHeight = sceneInfo[i].objs.container.offsetHeight;
}
sceneInfo[i].objs.container.style.height = `${sceneInfo[i].scrollHeight}px`;
}
// 새로고침 해도 씬이 고정되게 세팅
yOffset = window.pageYOffset;
let totalScrollHeight = 0;
for (let i = 0; i < sceneInfo.length; i++) {
totalScrollHeight += sceneInfo[i].scrollHeight;
if(totalScrollHeight >= yOffset) {
currentScene = i;
break;
}
}
document.body.setAttribute('id', `show-scene-${currentScene}`);
const heightRatio = window.innerHeight / 1080; // 디바이스 높이에 따라 이미지 조정
sceneInfo[0].objs.canvas.style.transform = `translate3d(-50%, -50%, 0) scale(${heightRatio})`;
sceneInfo[2].objs.canvas.style.transform = `translate3d(-50%, -50%, 0) scale(${heightRatio})`;
// translate3d로 가운데 정렬 후 scale로 이미지 크기 조정
}
function calcValues(values, currentYOffset) {
let rv;
// 현재 씬(스크롤섹션)에서 스크롤 된 범위를 0~1 사이의 비율로 구하기
const scrollHeight = sceneInfo[currentScene].scrollHeight;
const scrollRatio = currentYOffset / scrollHeight;
if (values.length === 3) {
// start ~ end 사이에 애니메이션 실행
const partScrollStart = values[2].start * scrollHeight;
const partScrollEnd = values[2].end * scrollHeight;
const partScrollHeight = partScrollEnd - partScrollStart;
if(currentYOffset >= partScrollStart && currentYOffset <= partScrollEnd) {
rv = (currentYOffset - partScrollStart) / partScrollHeight * (values[1] - values[0]) + values[0];
} else if (currentYOffset < partScrollStart) {
rv = values[0];
} else if (currentYOffset > partScrollEnd) {
rv = values[1];
}
} else {
rv = scrollRatio * (values[1] - values[0]) + values[0];
}
return rv;
}
function playAnimation() {
const objs = sceneInfo[currentScene].objs;
const values = sceneInfo[currentScene].values;
const currentYOffset = yOffset - prevScrollHeight; // 현재 씬에서 얼만큼 스크롤했는지를 확인
const scrollHeight = sceneInfo[currentScene].scrollHeight;
// const scrollRatio = yOffset / 현재 씬의 scrollHeight;
const scrollRatio = currentYOffset / scrollHeight;
switch (currentScene) {
case 0:
// console.log('0 play');
let sequence = Math.round(calcValues(values.imageSequenc, currentYOffset));
objs.context.drawImage(objs.videoImages[sequence], 0, 0);
objs.canvas.style.opacity = calcValues(values.canvas_opacity, currentYOffset);
if (scrollRatio <= 0.22) {
// in
objs.messageA.style.opacity = calcValues(values.messageA_opacity_in, currentYOffset);
objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_in, currentYOffset)}%, 0)`;
} else {
// out
objs.messageA.style.opacity = calcValues(values.messageA_opacity_out, currentYOffset);
objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_out, currentYOffset)}%, 0)`;
}
if (scrollRatio <= 0.42) {
// in
objs.messageB.style.opacity = calcValues(values.messageB_opacity_in, currentYOffset);
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_in, currentYOffset)}%, 0)`;
} else {
// out
objs.messageB.style.opacity = calcValues(values.messageB_opacity_out, currentYOffset);
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_out, currentYOffset)}%, 0)`;
}
if (scrollRatio <= 0.62) {
// in
objs.messageC.style.opacity = calcValues(values.messageC_opacity_in, currentYOffset);
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_in, currentYOffset)}%, 0)`;
} else {
// out
objs.messageC.style.opacity = calcValues(values.messageC_opacity_out, currentYOffset);
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_out, currentYOffset)}%, 0)`;
}
if (scrollRatio <= 0.82) {
// in
objs.messageD.style.opacity = calcValues(values.messageD_opacity_in, currentYOffset);
objs.messageD.style.transform = `translate3d(0, ${calcValues(values.messageD_translateY_in, currentYOffset)}%, 0)`;
} else {
// out
objs.messageD.style.opacity = calcValues(values.messageD_opacity_out, currentYOffset);
objs.messageD.style.transform = `translate3d(0, ${calcValues(values.messageD_translateY_out, currentYOffset)}%, 0)`;
}
break;
case 2:
// console.log('2 play');
let sequence2 = Math.round(calcValues(values.imageSequenc, currentYOffset));
objs.context.drawImage(objs.videoImages[sequence2], 0, 0);
if (scrollRatio <= 0.32) {
// in
objs.messageA.style.opacity = calcValues(values.messageA_opacity_in, currentYOffset);
objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_in, currentYOffset)}%, 0)`;
} else {
// out
objs.messageA.style.opacity = calcValues(values.messageA_opacity_out, currentYOffset);
objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_out, currentYOffset)}%, 0)`;
}
if (scrollRatio <= 0.67) {
// in
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_in, currentYOffset)}%, 0)`;
objs.messageB.style.opacity = calcValues(values.messageB_opacity_in, currentYOffset);
objs.pinB.style.transform = `scaleY(${calcValues(values.pinB_scaleY, currentYOffset)})`;
} else {
// out
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_out, currentYOffset)}%, 0)`;
objs.messageB.style.opacity = calcValues(values.messageB_opacity_out, currentYOffset);
objs.pinB.style.transform = `scaleY(${calcValues(values.pinB_scaleY, currentYOffset)})`;
}
if (scrollRatio <= 0.93) {
// in
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_in, currentYOffset)}%, 0)`;
objs.messageC.style.opacity = calcValues(values.messageC_opacity_in, currentYOffset);
objs.pinC.style.transform = `scaleY(${calcValues(values.pinC_scaleY, currentYOffset)})`;
} else {
// out
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_out, currentYOffset)}%, 0)`;
objs.messageC.style.opacity = calcValues(values.messageC_opacity_out, currentYOffset);
objs.pinC.style.transform = `scaleY(${calcValues(values.pinC_scaleY, currentYOffset)})`;
}
break;
case 3:
// console.log('3 play');
break;
}
}
function scrollLoop() {
enterNewScene = false;
prevScrollHeight = 0;
for (let i = 0; i < currentScene; i++) {
prevScrollHeight += sceneInfo[i].scrollHeight;
}
if (yOffset > prevScrollHeight + sceneInfo[currentScene].scrollHeight) {
enterNewScene = true;
currentScene ++;
document.body.setAttribute('id', `show-scene-${currentScene}`);
} if (yOffset < prevScrollHeight) {
enterNewScene = true;
if(currentScene === 0) return; // 브라우저 바운스 효과로 인해 마이너스가 되는 것을 방지 (모바일)
currentScene --;
document.body.setAttribute('id', `show-scene-${currentScene}`);
}
if (enterNewScene) return;
playAnimation();
}
window.addEventListener('scroll', () => {
yOffset = window.pageYOffset;
scrollLoop();
});
// window.addEventListener('DOMcontentLoaded', setLayout) 이미지가 업로드 되기 전에 실행
window.addEventListener('load', () => {
setLayout();
sceneInfo[0].objs.context.drawImage(sceneInfo[0].objs.videoImages[0], 0, 0);
});
window.addEventListener('resize', setLayout);
setCanvasImages();
})();
