-
질문 & 답변
카테고리
-
세부 분야
프론트엔드
-
해결 여부
미해결
캔버스 동작 오류
21.12.01 10:21 작성 조회수 226
0
안녕하세요 강의 보면서 따라하던 도중 오류가 생겼는데
어떻게 해결을 해야할지 감이 안와서 질문 남깁니다..
문제)
case3 에서 캔버스가 그려지고 난후 clear가 되지 않아서
계속 겹쳐져서 그려짐 (아래 이미지 첨부)
-> clearRect를 사용했더니 fillstyle이 적용안됨 ㅠㅠ
강의를 다시 돌려보면서 혹시 오타라도 났나 싶어 계속 오류를 찾아보고 있는데 발견을 못하겠습니다ㅠㅠ
이 경우에는 어떻게 접근해야 좋을까요?
아래 이미지는 검은색 영역이 그려지고 없어지지 않아서
이미지와 겹쳐있습니다. (이미지는png라서 배경을 따로 줬어요! 배경을 없애도 똑같네요 ㅠ)
근대 캔버스가 움직이는건 아무리 해도 모르겠네요 ㅠㅠ
참고!
가끔 아래서 새로고침후, 위로 올릴때만 정상적으로 동작합니다!
선생님 코드와 다른점 )
영상을 사진으로 변화한것은 예제와 다른걸 썻는데 ,
크기가 제각각이라 제가 임의로 heightRatio를 다르게 썻습니다. 그래서 스크롤을 빠르게 하거나 창크기가 바뀌면 하얀 부분이 나오는데 이거는 제가 다시 계산해서 할 수 있을꺼 같습니다.
그 외 나머지는 css가 조금 다른것 빼고 html, js부분은 똑같습니다.
아래쪽에 제 코드 첨부합니다
(() => {
let yOffset = 0; //window.pageYOffset 대신 사용할 변수
let prevScrollHeight = 0; //현재 스크롤위치(yoffset)보다 이전에 위치한 스크롤 섹션들의 스크롤 높이의 합
let currentScene = 0; //현재활성화된 씬((지금 보고있는 스크린)(=scroll-section)
let enterNewScene = false; //새로운 씬이 시작되는 순간 True (씬이 바뀔때 생기는 오류 방지변수)
const sceneInfo = [
// 배열 객체는 4개를 만든다(섹션이 4개이기 때문)
{//1
type:'sticky',
//브라우저 높이의 5배로 scrollHeight 세팅
heightNum:5,
// 스크롤높이
scrollHeight:0,
objs: {
container: document.querySelector('#scroll-section-1'),
messageA: document.querySelector('#scroll-section-1 .main-message.a'),
messageB: document.querySelector('#scroll-section-1 .main-message.b'),
messageC: document.querySelector('#scroll-section-1 .main-message.c'),
messageD: document.querySelector('#scroll-section-1 .main-message.d'),
canvas: document.querySelector('#video-canvas-0'),
context: document.querySelector('#video-canvas-0').getContext('2d'),
videoImages: []
},
values: {
videoImageCount: 313,
imageSequence:[0, 312],
canvasOpacity:[1,0,{start:0.9, end:1}],
messageA_opacity_in:[0, 1, {start: 0.1, end: 0.2}],
messageA_translateY_in:[20, 0, {start: 0.1, end: 0.2}],
messageA_opacity_out:[1, 0, {start: 0.25, end: 0.3}],
messageA_translateY_out:[0, -20, {start: 0.25, end: 0.3}],
messageB_opacity_in:[0, 1, {start: 0.3, end: 0.4}],
messageB_translateY_in:[20, 0, {start: 0.3, end: 0.4}],
messageB_opacity_out:[1, 0, {start: 0.45, end: 0.5}],
messageB_translateY_out:[0, -20, {start: 0.45, end: 0.5}],
messageC_opacity_in:[0, 1, {start: 0.5, end: 0.6}],
messageC_translateY_in:[20, 0, {start: 0.5, end: 0.6}],
messageC_opacity_out:[1, 0, {start: 0.65, end: 0.7}],
messageC_translateY_out:[0, -20, {start: 0.65, end: 0.7}],
messageD_opacity_in:[0, 1, {start: 0.7, end: 0.8}],
messageD_translateY_in:[20, 0, {start: 0.7, end: 0.8}],
messageD_opacity_out:[1, 0, {start: 0.85, end: 0.95}],
messageD_translateY_out:[0, -20, {start: 0.85, end: 0.95}],
}
},
{//2
type:'nomal',
// heightNum:5 노말에서는 필요없음
scrollHeight:0,
objs: {
container:document.querySelector('#scroll-section-2')
}
},
{//3
type:'sticky',
heightNum:5,
scrollHeight:0,
objs: {
container: document.querySelector('#scroll-section-3'),
messageA: document.querySelector('#scroll-section-3 .a'),
messageB: document.querySelector('#scroll-section-3 .b'),
messageC: document.querySelector('#scroll-section-3 .c'),
pinB: document.querySelector('#scroll-section-3 .b .pin'),
pinC: document.querySelector('#scroll-section-3 .c .pin'),
canvas: document.querySelector('#video-canvas-2'),
context: document.querySelector('#video-canvas-2').getContext('2d'),
videoImages: []
},
values: {
videoImageCount: 292,
imageSequence:[0, 291],
canvasOpacity_in:[0,1,{start:0, end:0.1}],
canvasOpacity_out:[1,0,{start:0.9, end:1}],
messageA_opacity_in: [0, 1, { start: 0.15, end: 0.2 }],
messageA_translateY_in: [20, 0, { start: 0.15, end: 0.2 }],
messageA_opacity_out: [1, 0, { start: 0.3, end: 0.35 }],
messageA_translateY_out: [0, -20, { start: 0.3, end: 0.35 }],
messageB_opacity_in: [0, 1, { start: 0.5, end: 0.55 }],
messageB_translateY_in: [50, 30, { start: 0.5, end: 0.55 }],
messageB_opacity_out: [1, 0, { start: 0.58, end: 0.63 }],
messageB_translateY_out: [30, 0, { start: 0.58, end: 0.63 }],
messageC_opacity_in: [0, 1, { start: 0.72, end: 0.77 }],
messageC_translateY_in: [50, 30, { start: 0.72, end: 0.77 }],
messageC_opacity_out: [1, 0, { start: 0.85, end: 0.9 }],
messageC_translateY_out: [30, 0, { start: 0.85, end: 0.9 }],
pinB_scaleY: [0.5, 1, { start: 0.5, end: 0.55 }],
pinC_scaleY: [0.5, 1, { start: 0.72, end: 0.77 }],
pinB_opacity_in: [0, 1, { start: 0.5, end: 0.55 }],
pinC_opacity_in: [0, 1, { start: 0.72, end: 0.77 }],
pinB_opacity_out: [1, 0, { start: 0.58, end: 0.63 }],
pinC_opacity_out: [1, 0, { start: 0.85, end: 0.9 }]
}
},
{//4
type:'sticky',
heightNum:5,
scrollHeight:0,
objs: {
container:document.querySelector('#scroll-section-4'),
canvasCaption: document.querySelector('.canvas-caption'),
canvas: document.querySelector('.image-blend-canvas'),
context: document.querySelector('.image-blend-canvas').getContext('2d'),
imagePath: [
'./images/mecolro.PNG',
'./images/IMG_1667.JPG'
],
images: [],
},
values: {
rect1X: [0, 0, {start:0, end: 0}],
rect2X: [0, 0, {start:0, end: 0}],
rectStartY: 0,
}
}
];
function setCanvasImage(){
let imgElem;
for (let i = 0; i < sceneInfo[0].values.videoImageCount; i++){
imgElem = new Image();
imgElem.src = `/video/myhome_30frame_4k/frame_${1 + i}.jpg`;
sceneInfo[0].objs.videoImages.push(imgElem);
};
let imgElem2;
for (let i = 0; i < sceneInfo[2].values.videoImageCount; i++){
imgElem2 = new Image();
imgElem2.src = `/video/logo_30frame/frame_${1 + i}.jpg`;
sceneInfo[2].objs.videoImages.push(imgElem2);
};
let imgElem3;
for (let i = 0; i < sceneInfo[3].objs.imagePath.length; i++){
imgElem3 = new Image();
imgElem3.src = sceneInfo[3].objs.imagePath[i];
sceneInfo[3].objs.images.push(imgElem3);
};
};
setCanvasImage();
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 == 'nomal'){
sceneInfo[i].scrollHeight = sceneInfo[i].objs.container.offsetHeight;
}
sceneInfo[i].objs.container.style.height = `${sceneInfo[i].scrollHeight}px`;
}
yOffset = window.pageYOffset //변수범위가달라서 통일감을 주기위해 똑같은 변수 새로 삽입
let totalscrollHeight = 0;
for (let i =0; i < sceneInfo.length; i++){
totalscrollHeight += sceneInfo[i].scrollHeight;
if(totalscrollHeight >= yOffset){
currentScene = i;
break;
}
}
document.body.setAttribute('id', `show-scene-${currentScene}`);
// console.log(sceneInfo);
let heightRatio = sceneInfo[currentScene].scrollHeight / 2160 / 3;
// if(heightRatio > 0.7){heightRatio = 0.7;};
sceneInfo[0].objs.canvas.style.transform = `translate3d(-50%, -50%, 0) scale(${heightRatio})`;
sceneInfo[2].objs.canvas.style.transform = `translate3d(-50%, -50%, 0) scale(${heightRatio})`;
// console.log(currentScene);
// console.log(heightRatio);
};
function calcValues(values, currentYOffset){
let rv;
const scrollHeight = sceneInfo[currentScene].scrollHeight;
const scrollRatio = currentYOffset / scrollHeight;
//star와 end의 애니메이션 실행
if(values.length == 3){
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;
const scrollHeight = sceneInfo[currentScene].scrollHeight;
const scrollRatio = currentYOffset / scrollHeight;
switch (currentScene){
case 0:
let sequence = Math.round(calcValues(values.imageSequence, currentYOffset));
objs.context.drawImage(objs.videoImages[sequence],0 ,0);
objs.canvas.style.opacity = calcValues(values.canvasOpacity, currentYOffset);
if(scrollRatio <= 0.22){
objs.messageA.style.opacity = calcValues(values.messageA_opacity_in, currentYOffset);
objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_in, currentYOffset)}%, 0)`;
} else{
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){
objs.messageB.style.opacity = calcValues(values.messageB_opacity_in, currentYOffset);
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_in, currentYOffset)}%, 0)`;
} else{
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){
objs.messageC.style.opacity = calcValues(values.messageC_opacity_in, currentYOffset);
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_in, currentYOffset)}%, 0)`;
} else{
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){
objs.messageD.style.opacity = calcValues(values.messageD_opacity_in, currentYOffset);
objs.messageD.style.transform = `translate3d(0, ${calcValues(values.messageD_translateY_in, currentYOffset)}%, 0)`;
} else{
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 1:
// 노말타입이라 동작을 안하므로 지워도 되지만 미관상 놔둔다
break;
case 2:
let sequence2 = Math.round(calcValues(values.imageSequence, currentYOffset));
objs.context.drawImage(objs.videoImages[sequence2],0 ,0);
if(scrollRatio <= 0.5){
objs.canvas.style.opacity = calcValues(values.canvasOpacity_in, currentYOffset);
} else{
objs.canvas.style.opacity = calcValues(values.canvasOpacity_out, currentYOffset);
}
if(scrollRatio <= 0.22){
objs.messageA.style.opacity = calcValues(values.messageA_opacity_in, currentYOffset);
objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_in, currentYOffset)}%, 0)`;
} else{
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 <= 0.57){
objs.messageB.style.opacity = calcValues(values.messageB_opacity_in, currentYOffset);
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_in, currentYOffset)}%, 0)`;
objs.pinB.style.transform = `scaleY(${calcValues(values.pinB_scaleY, currentYOffset)})`;
} else{
objs.messageB.style.opacity = calcValues(values.messageB_opacity_out, currentYOffset);
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_out, currentYOffset)}%, 0)`;
objs.pinB.style.transform = `scaleY(${calcValues(values.pinB_scaleY, currentYOffset)})`;
}
if(scrollRatio <= 0.83){
objs.messageC.style.opacity = calcValues(values.messageC_opacity_in, currentYOffset);
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_in, currentYOffset)}%, 0)`;
objs.pinC.style.transform = `scaleY(${calcValues(values.pinC_scaleY, currentYOffset)})`;
} else{
objs.messageC.style.opacity = calcValues(values.messageC_opacity_out, currentYOffset);
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_out, currentYOffset)}%, 0)`;
objs.pinC.style.transform = `scaleY(${calcValues(values.pinC_scaleY, currentYOffset)})`;
}
// case3에서 그려질 canvas를 case2에서 미리 동작하게 만들어주자 (코드는 반복, 수치만 살짝 바꿈)
if(scrollRatio > 0.9){
// case2에서 사용되는 objs와 values값이 다르지만 if문을 통해 영역을 설정했으므로 const로 다시 선언해준다!
const objs = sceneInfo[3].objs;
const values = sceneInfo[3].values;
const widthRatio = window.innerWidth / objs.canvas.width;
const heightRatio = window.innerHeight / objs.canvas.height;
let canvasScaleRatio;
if(widthRatio <= heightRatio){
canvasScaleRatio = heightRatio;
} else {canvasScaleRatio = widthRatio;}
objs.canvas.style.transform = `scale(${canvasScaleRatio})`;
objs.context.fillStyle = 'white';
objs.context.drawImage(objs.images[0],0 ,0);
const canvasCalcWidth = document.body.offsetWidth / canvasScaleRatio;
const whiteRectWidth = canvasCalcWidth * 0.2;
values.rect1X[0] = (objs.canvas.width - canvasCalcWidth) / 2;
values.rect1X[1] = values.rect1X[0] - whiteRectWidth;
values.rect2X[0] = values.rect1X[0] + canvasCalcWidth - whiteRectWidth;
values.rect2X[1] = values.rect2X[0] + whiteRectWidth;
// 시작위치는 초기값으로 설정 (values.rectnX[0])
objs.context.fillRect(
parseInt(values.rect1X[0]),
0,
parseInt(whiteRectWidth),
objs.canvas.height
);
objs.context.fillRect(
parseInt(values.rect2X[0]),
0,
parseInt(whiteRectWidth),
objs.canvas.height
);
}
break;
case 3:
let step = 0;
// 가로세로 모두 꽉차게 하기 위해 여기에 세팅 (계산 필요)
const widthRatio = window.innerWidth / objs.canvas.width;
const heightRatio = window.innerHeight / objs.canvas.height;
let canvasScaleRatio;
if(widthRatio <= heightRatio){
canvasScaleRatio = heightRatio;
// 캔버스보다 브라우저창이 홀쭉한 경우
} else {canvasScaleRatio = widthRatio;}
// 캔버스보더 브라우저창이 납작한 경우
objs.canvas.style.transform = `scale(${canvasScaleRatio})`;
objs.context.fillStyle = 'black';
objs.context.drawImage(objs.images[0],0 ,0);
// 캔버스 사이즈에 맞춰 가정한 innerwidth와 innerheight
const canvasCalcWidth = document.body.offsetWidth / canvasScaleRatio;
const canvasCalcHeight = window.innerHeight / canvasScaleRatio;
if(!values.rectStartY){
values.rectStartY =
objs.canvas.offsetTop + (objs.canvas.height - objs.canvas.height * canvasScaleRatio)/2;
values.rect1X[2].start = (window.innerHeight /2) / scrollHeight;
values.rect2X[2].start = (window.innerHeight /2) / scrollHeight;
values.rect1X[2].end = values.rectStartY / scrollHeight;
values.rect2X[2].end = values.rectStartY / scrollHeight;
}
// 캔버스 폭 넓이 조절
const whiteRectWidth = canvasCalcWidth * 0.2;
values.rect1X[0] = (objs.canvas.width - canvasCalcWidth) / 2;
values.rect1X[1] = values.rect1X[0] - whiteRectWidth;
values.rect2X[0] = values.rect1X[0] + canvasCalcWidth - whiteRectWidth;
values.rect2X[1] = values.rect2X[0] + whiteRectWidth;
objs.context.fillRect(
parseInt(calcValues(values.rect1X, currentYOffset)),
0,
parseInt(whiteRectWidth),
objs.canvas.height
);
objs.context.fillRect(
parseInt(calcValues(values.rect2X, currentYOffset)),
0,
parseInt(whiteRectWidth),
objs.canvas.height
);
console.log(parseInt(calcValues(values.rect1X, currentYOffset)));
//캔버스가 브라우저 상단에 닿은 경우부터 이미지 블랜드된 후 다시 스크롤되는 것을 3단계 step으로 나눈다
if(scrollRatio < values.rect1X[2].end / 9){
//캔버스가 브라우저 상단에 닿지 않은 단계
step = 1;
console.log('before')
objs.canvas.classList.remove('sticky');
} else {
//이미지가 블랜드되고 스케일이 조정되는 단계까지
step = 2;
console.log('after')
objs.canvas.classList.add('sticky');
objs.canvas.style.top = `${-(objs.canvas.height - objs.canvas.height * canvasScaleRatio)/2}px`;
// if(){
// //스케일 조정되고 다시 스크롤 되는 단계
// step = 3;
// };
};
break;
}
// console.log(currentScene);
}
function scrollLoop(){
enterNewScene = false;
prevScrollHeight = 0;
for (let i = 0; i < currentScene; i++){
prevScrollHeight += sceneInfo[i].scrollHeight;
}
if(yOffset > prevScrollHeight + sceneInfo[currentScene].scrollHeight){
enterNewScene = true;
currentScene++;
document.body.setAttribute('id', `show-scene-${currentScene}`);
}
if(yOffset < prevScrollHeight){
enterNewScene = true;
if(currentScene == 0) return;
currentScene--;
document.body.setAttribute('id', `show-scene-${currentScene}`);
}
if(enterNewScene) return;
playAnimation();
}
window.addEventListener('scroll',() => {
yOffset = window.pageYOffset;
scrollLoop();
});
window.addEventListener('load', () => {
setLayout();
sceneInfo[0].objs.context.drawImage(sceneInfo[0].objs.videoImages[0],0 ,0);
});
//DOMContentLoaded 도 많이사용 (이미지가 로딩안되도 로딩시키는 매서드) 하지만 여기서는 이미지가 중요하기 때문에 로드를 사용한다
window.addEventListener('resize',setLayout);
})();
답변을 작성해보세요.
0
답변 1