Eu encontrei uma boa solução para criar um elemento DRR em javascript aqui
Atualmente, gostaria de ter esse suporte de recurso para manter a proporção da imagem.
Aqui está o trecho:
var box = document.getElementById("box");
var boxWrapper = document.getElementById("box-wrapper");
const minWidth = 40;
const minHeight = 40;
var initX, initY, mousePressX, mousePressY, initW, initH, initRotate;
function repositionElement(x, y) {
boxWrapper.style.left = x + 'px';
boxWrapper.style.top = y + 'px';
}
function resize(w, h) {
box.style.width = w + 'px';
box.style.height = h + 'px';
}
function getCurrentRotation(el) {
var st = window.getComputedStyle(el, null);
var tm = st.getPropertyValue("-webkit-transform") ||
st.getPropertyValue("-moz-transform") ||
st.getPropertyValue("-ms-transform") ||
st.getPropertyValue("-o-transform") ||
st.getPropertyValue("transform")
"none";
if (tm != "none") {
var values = tm.split('(')[1].split(')')[0].split(',');
var angle = Math.round(Math.atan2(values[1], values[0]) * (180 / Math.PI));
return (angle < 0 ? angle + 360 : angle);
}
return 0;
}
function rotateBox(deg) {
boxWrapper.style.transform = `rotate(${deg}deg)`;
}
// drag support
boxWrapper.addEventListener('mousedown', function (event) {
if (event.target.className.indexOf("dot") > -1) {
return;
}
initX = this.offsetLeft;
initY = this.offsetTop;
mousePressX = event.clientX;
mousePressY = event.clientY;
function eventMoveHandler(event) {
repositionElement(initX + (event.clientX - mousePressX),
initY + (event.clientY - mousePressY));
}
boxWrapper.addEventListener('mousemove', eventMoveHandler, false);
window.addEventListener('mouseup', function eventEndHandler() {
boxWrapper.removeEventListener('mousemove', eventMoveHandler, false);
window.removeEventListener('mouseup', eventEndHandler);
}, false);
}, false);
// done drag support
// handle resize
var rightMid = document.getElementById("right-mid");
var leftMid = document.getElementById("left-mid");
var topMid = document.getElementById("top-mid");
var bottomMid = document.getElementById("bottom-mid");
var leftTop = document.getElementById("left-top");
var rightTop = document.getElementById("right-top");
var rightBottom = document.getElementById("right-bottom");
var leftBottom = document.getElementById("left-bottom");
function resizeHandler(event, left = false, top = false, xResize = false, yResize = false) {
initX = boxWrapper.offsetLeft;
initY = boxWrapper.offsetTop;
mousePressX = event.clientX;
mousePressY = event.clientY;
initW = box.offsetWidth;
initH = box.offsetHeight;
initRotate = getCurrentRotation(boxWrapper);
var initRadians = initRotate * Math.PI / 180;
var cosFraction = Math.cos(initRadians);
var sinFraction = Math.sin(initRadians);
function eventMoveHandler(event) {
var wDiff = (event.clientX - mousePressX);
var hDiff = (event.clientY - mousePressY);
var rotatedWDiff = cosFraction * wDiff + sinFraction * hDiff;
var rotatedHDiff = cosFraction * hDiff - sinFraction * wDiff;
var newW = initW, newH = initH, newX = initX, newY = initY;
if (xResize) {
if (left) {
newW = initW - rotatedWDiff;
if (newW < minWidth) {
newW = minWidth;
rotatedWDiff = initW - minWidth;
}
} else {
newW = initW + rotatedWDiff;
if (newW < minWidth) {
newW = minWidth;
rotatedWDiff = minWidth - initW;
}
}
newX += 0.5 * rotatedWDiff * cosFraction;
newY += 0.5 * rotatedWDiff * sinFraction;
}
if (yResize) {
if (top) {
newH = initH - rotatedHDiff;
if (newH < minHeight) {
newH = minHeight;
rotatedHDiff = initH - minHeight;
}
} else {
newH = initH + rotatedHDiff;
if (newH < minHeight) {
newH = minHeight;
rotatedHDiff = minHeight - initH;
}
}
newX -= 0.5 * rotatedHDiff * sinFraction;
newY += 0.5 * rotatedHDiff * cosFraction;
}
resize(newW, newH);
repositionElement(newX, newY);
}
window.addEventListener('mousemove', eventMoveHandler, false);
window.addEventListener('mouseup', function eventEndHandler() {
window.removeEventListener('mousemove', eventMoveHandler, false);
window.removeEventListener('mouseup', eventEndHandler);
}, false);
}
rightMid.addEventListener('mousedown', e => resizeHandler(e, false, false, true, false));
leftMid.addEventListener('mousedown', e => resizeHandler(e, true, false, true, false));
topMid.addEventListener('mousedown', e => resizeHandler(e, false, true, false, true));
bottomMid.addEventListener('mousedown', e => resizeHandler(e, false, false, false, true));
leftTop.addEventListener('mousedown', e => resizeHandler(e, true, true, true, true));
rightTop.addEventListener('mousedown', e => resizeHandler(e, false, true, true, true));
rightBottom.addEventListener('mousedown', e => resizeHandler(e, false, false, true, true));
leftBottom.addEventListener('mousedown', e => resizeHandler(e, true, false, true, true));
// handle rotation
var rotate = document.getElementById("rotate");
rotate.addEventListener('mousedown', function (event) {
// if (event.target.className.indexOf("dot") > -1) {
// return;
// }
initX = this.offsetLeft;
initY = this.offsetTop;
mousePressX = event.clientX;
mousePressY = event.clientY;
var arrow = document.querySelector("#box");
var arrowRects = arrow.getBoundingClientRect();
var arrowX = arrowRects.left + arrowRects.width / 2;
var arrowY = arrowRects.top + arrowRects.height / 2;
function eventMoveHandler(event) {
var angle = Math.atan2(event.clientY - arrowY, event.clientX - arrowX) + Math.PI / 2;
rotateBox(angle * 180 / Math.PI);
}
window.addEventListener('mousemove', eventMoveHandler, false);
window.addEventListener('mouseup', function eventEndHandler() {
window.removeEventListener('mousemove', eventMoveHandler, false);
window.removeEventListener('mouseup', eventEndHandler);
}, false);
}, false);
resize(200, 200);
repositionElement(200, 200);
.box {
background-color: #00BCD4;
position: relative;
user-select: none;
transform: translate(-50%, -50%);
}
.box-wrapper {
position: absolute;
transform-origin: top left;
user-select: none;
}
.dot {
height: 10px;
width: 10px;
background-color: #1E88E5;
position: absolute;
border-radius: 100px;
border: 1px solid white;
user-select: none;
}
.dot:hover {
background-color: #0D47A1;
}
.dot.left-top {
top: -5px;
left: -5px;
/* cursor: nw-resize; */
}
.dot.left-bottom {
bottom: -5px;
left: -5px;
/* cursor: sw-resize; */
}
.dot.right-top {
top: -5px;
right: -5px;
/* cursor: ne-resize; */
}
.dot.right-bottom {
bottom: -5px;
right: -5px;
/* cursor: se-resize; */
}
.dot.top-mid {
top: -5px;
left: calc(50% - 5px);
/* cursor: n-resize; */
}
.dot.left-mid {
left: -5px;
top: calc(50% - 5px);
/* cursor: w-resize; */
}
.dot.right-mid {
right: -5px;
top: calc(50% - 5px);
/* cursor: e-resize; */
}
.dot.bottom-mid {
bottom: -5px;
left: calc(50% - 5px);
/* cursor: s-resize; */
}
.dot.rotate {
top: -30px;
left: calc(50% - 5px);
cursor: url('https://findicons.com/files/icons/1620/crystal_project/16/rotate_ccw.png'), auto;
}
.rotate-link {
position: absolute;
width: 1px;
height: 15px;
background-color: #1E88E5;
top: -20px;
left: calc(50% + 0.5px);
z-index: -1;
}
<div class="box-wrapper" id="box-wrapper">
<div class="box" id="box">
<div class="dot rotate" id="rotate"></div>
<div class="dot left-top" id="left-top"></div>
<div class="dot left-bottom" id="left-bottom"></div>
<div class="dot top-mid" id="top-mid"></div>
<div class="dot bottom-mid" id="bottom-mid"></div>
<div class="dot left-mid" id="left-mid"></div>
<div class="dot right-mid" id="right-mid"></div>
<div class="dot right-bottom" id="right-bottom"></div>
<div class="dot right-top" id="right-top"></div>
<div class="rotate-link"></div>
</div>
</div>
Tudo bem se as respostas estiverem relacionadas à manutenção apenas da proporção quadrada.
resize
função, defina a altura e a largura igualmente.O recurso de rotação pode ser ignorado, estou procurando um elemento de reposicionamento com precisão.
Obrigado! por suas respostas apreciáveis.
Existem dois desafios para essa questão: manter uma proporção de aspecto (que é bastante simples) e também calcular a posição com base nos pontos de ancoragem (o que pode ser complicado no exemplo).
No exemplo original, a posição e a magnitude de cada dimensão são calculadas separadamente (largura e posição x calculadas no mesmo bloco de código, depois altura e posição y):
if (xResize) {
// recalculate width
if (left) {
newW = initW - rotatedWDiff;
if (newW < minWidth) {
newW = minWidth;
rotatedWDiff = initW - minWidth;
}
} else {
newW = initW + rotatedWDiff;
if (newW < minWidth) {
newW = minWidth;
rotatedWDiff = minWidth - initW;
}
}
// recalculate position
newX += 0.5 * rotatedWDiff * cosFraction;
newY += 0.5 * rotatedWDiff * sinFraction;
}
if (yResize) {
// recalculate height
if (top) {
newH = initH - rotatedHDiff;
if (newH < minHeight) {
newH = minHeight;
rotatedHDiff = initH - minHeight;
}
} else {
newH = initH + rotatedHDiff;
if (newH < minHeight) {
newH = minHeight;
rotatedHDiff = minHeight - initH;
}
}
// recalculate position
newX -= 0.5 * rotatedHDiff * sinFraction;
newY += 0.5 * rotatedHDiff * cosFraction;
}
Para manter a proporção da imagem, você precisa restringir a largura e a altura em relação uma à outra e, a seguir, reposicionar com base nesses valores. Como o reposicionamento com base na altura e largura agora dependem um do outro, isso torna o código um pouco mais complicado:
// calculate new width and height
if (xResize) {
if (left) {
newW = initW - rotatedWDiff;
if (newW < minWidth) {
newW = minWidth;
}
} else {
newW = initW + rotatedWDiff;
if (newW < minWidth) {
newW = minWidth;
}
}
}
if (yResize) {
if (top) {
newH = initH - rotatedHDiff;
if (newH < minHeight) {
newH = minHeight;
}
} else {
newH = initH + rotatedHDiff;
if (newH < minHeight) {
newH = minHeight;
}
}
}
// constrain aspect ratio, if a corner is being dragged
var scale;
if (xResize && yResize) {
scale = Math.max(newW / initW, newH / initH);
newW = scale * initW;
newH = scale * initH;
}
// recalculate position
if (xResize) {
if (left) {
rotatedWDiff = initW - newW;
} else {
rotatedWDiff = newW - initW;
}
newX += 0.5 * rotatedWDiff * cosFraction;
newY += 0.5 * rotatedWDiff * sinFraction;
}
if (yResize) {
if (top) {
rotatedHDiff = initH - newH;
} else {
rotatedHDiff = newH - initH;
}
newX -= 0.5 * rotatedHDiff * sinFraction;
newY += 0.5 * rotatedHDiff * cosFraction;
}
Ao todo, é assim:
var box = document.getElementById("box");
var boxWrapper = document.getElementById("box-wrapper");
const minWidth = 40;
const minHeight = 40;
var initX, initY, mousePressX, mousePressY, initW, initH, initRotate;
function repositionElement(x, y) {
boxWrapper.style.left = x + 'px';
boxWrapper.style.top = y + 'px';
}
function resize(w, h) {
box.style.width = w + 'px';
box.style.height = h + 'px';
}
function getCurrentRotation(el) {
var st = window.getComputedStyle(el, null);
var tm = st.getPropertyValue("-webkit-transform") ||
st.getPropertyValue("-moz-transform") ||
st.getPropertyValue("-ms-transform") ||
st.getPropertyValue("-o-transform") ||
st.getPropertyValue("transform")
"none";
if (tm != "none") {
var values = tm.split('(')[1].split(')')[0].split(',');
var angle = Math.round(Math.atan2(values[1], values[0]) * (180 / Math.PI));
return (angle < 0 ? angle + 360 : angle);
}
return 0;
}
function rotateBox(deg) {
boxWrapper.style.transform = `rotate(${deg}deg)`;
}
// drag support
boxWrapper.addEventListener('mousedown', function (event) {
if (event.target.className.indexOf("dot") > -1) {
return;
}
initX = this.offsetLeft;
initY = this.offsetTop;
mousePressX = event.clientX;
mousePressY = event.clientY;
function eventMoveHandler(event) {
repositionElement(initX + (event.clientX - mousePressX),
initY + (event.clientY - mousePressY));
}
boxWrapper.addEventListener('mousemove', eventMoveHandler, false);
window.addEventListener('mouseup', function eventEndHandler() {
boxWrapper.removeEventListener('mousemove', eventMoveHandler, false);
window.removeEventListener('mouseup', eventEndHandler);
}, false);
}, false);
// done drag support
// handle resize
var rightMid = document.getElementById("right-mid");
var leftMid = document.getElementById("left-mid");
var topMid = document.getElementById("top-mid");
var bottomMid = document.getElementById("bottom-mid");
var leftTop = document.getElementById("left-top");
var rightTop = document.getElementById("right-top");
var rightBottom = document.getElementById("right-bottom");
var leftBottom = document.getElementById("left-bottom");
function resizeHandler(event, left = false, top = false, xResize = false, yResize = false) {
initX = boxWrapper.offsetLeft;
initY = boxWrapper.offsetTop;
mousePressX = event.clientX;
mousePressY = event.clientY;
initW = box.offsetWidth;
initH = box.offsetHeight;
initRotate = getCurrentRotation(boxWrapper);
var initRadians = initRotate * Math.PI / 180;
var cosFraction = Math.cos(initRadians);
var sinFraction = Math.sin(initRadians);
function eventMoveHandler(event) {
var wDiff = (event.clientX - mousePressX);
var hDiff = (event.clientY - mousePressY);
var rotatedWDiff = cosFraction * wDiff + sinFraction * hDiff;
var rotatedHDiff = cosFraction * hDiff - sinFraction * wDiff;
var newW = initW, newH = initH, newX = initX, newY = initY;
// calculate new width and height
if (xResize) {
if (left) {
newW = initW - rotatedWDiff;
if (newW < minWidth) {
newW = minWidth;
}
} else {
newW = initW + rotatedWDiff;
if (newW < minWidth) {
newW = minWidth;
}
}
}
if (yResize) {
if (top) {
newH = initH - rotatedHDiff;
if (newH < minHeight) {
newH = minHeight;
}
} else {
newH = initH + rotatedHDiff;
if (newH < minHeight) {
newH = minHeight;
}
}
}
var scale;
// constrain aspect ratio, if a corner is being dragged
// can remove the conditional if aspect ratio should always be preserved
if (xResize && yResize) {
scale = Math.max(newW / initW, newH / initH);
newW = scale * initW;
newH = scale * initH;
}
// recalculate position
if (xResize) {
if (left) {
rotatedWDiff = initW - newW;
} else {
rotatedWDiff = newW - initW;
}
newX += 0.5 * rotatedWDiff * cosFraction;
newY += 0.5 * rotatedWDiff * sinFraction;
}
if (yResize) {
if (top) {
rotatedHDiff = initH - newH;
} else {
rotatedHDiff = newH - initH;
}
newX -= 0.5 * rotatedHDiff * sinFraction;
newY += 0.5 * rotatedHDiff * cosFraction;
}
resize(newW, newH);
repositionElement(newX, newY);
}
window.addEventListener('mousemove', eventMoveHandler, false);
window.addEventListener('mouseup', function eventEndHandler() {
window.removeEventListener('mousemove', eventMoveHandler, false);
window.removeEventListener('mouseup', eventEndHandler);
}, false);
}
rightMid.addEventListener('mousedown', e => resizeHandler(e, false, false, true, false));
leftMid.addEventListener('mousedown', e => resizeHandler(e, true, false, true, false));
topMid.addEventListener('mousedown', e => resizeHandler(e, false, true, false, true));
bottomMid.addEventListener('mousedown', e => resizeHandler(e, false, false, false, true));
leftTop.addEventListener('mousedown', e => resizeHandler(e, true, true, true, true));
rightTop.addEventListener('mousedown', e => resizeHandler(e, false, true, true, true));
rightBottom.addEventListener('mousedown', e => resizeHandler(e, false, false, true, true));
leftBottom.addEventListener('mousedown', e => resizeHandler(e, true, false, true, true));
// handle rotation
var rotate = document.getElementById("rotate");
rotate.addEventListener('mousedown', function (event) {
// if (event.target.className.indexOf("dot") > -1) {
// return;
// }
initX = this.offsetLeft;
initY = this.offsetTop;
mousePressX = event.clientX;
mousePressY = event.clientY;
var arrow = document.querySelector("#box");
var arrowRects = arrow.getBoundingClientRect();
var arrowX = arrowRects.left + arrowRects.width / 2;
var arrowY = arrowRects.top + arrowRects.height / 2;
function eventMoveHandler(event) {
var angle = Math.atan2(event.clientY - arrowY, event.clientX - arrowX) + Math.PI / 2;
rotateBox(angle * 180 / Math.PI);
}
window.addEventListener('mousemove', eventMoveHandler, false);
window.addEventListener('mouseup', function eventEndHandler() {
window.removeEventListener('mousemove', eventMoveHandler, false);
window.removeEventListener('mouseup', eventEndHandler);
}, false);
}, false);
resize(300, 200);
repositionElement(200, 200);
.box {
background-color: #00BCD4;
position: relative;
user-select: none;
transform: translate(-50%, -50%);
}
.box-wrapper {
position: absolute;
transform-origin: top left;
user-select: none;
}
.dot {
height: 10px;
width: 10px;
background-color: #1E88E5;
position: absolute;
border-radius: 100px;
border: 1px solid white;
user-select: none;
}
.dot:hover {
background-color: #0D47A1;
}
.dot.left-top {
top: -5px;
left: -5px;
/* cursor: nw-resize; */
}
.dot.left-bottom {
bottom: -5px;
left: -5px;
/* cursor: sw-resize; */
}
.dot.right-top {
top: -5px;
right: -5px;
/* cursor: ne-resize; */
}
.dot.right-bottom {
bottom: -5px;
right: -5px;
/* cursor: se-resize; */
}
.dot.top-mid {
top: -5px;
left: calc(50% - 5px);
/* cursor: n-resize; */
}
.dot.left-mid {
left: -5px;
top: calc(50% - 5px);
/* cursor: w-resize; */
}
.dot.right-mid {
right: -5px;
top: calc(50% - 5px);
/* cursor: e-resize; */
}
.dot.bottom-mid {
bottom: -5px;
left: calc(50% - 5px);
/* cursor: s-resize; */
}
.dot.rotate {
top: -30px;
left: calc(50% - 5px);
cursor: url('https://findicons.com/files/icons/1620/crystal_project/16/rotate_ccw.png'), auto;
}
.rotate-link {
position: absolute;
width: 1px;
height: 15px;
background-color: #1E88E5;
top: -20px;
left: calc(50% + 0.5px);
z-index: -1;
}
<div class="box-wrapper" id="box-wrapper">
<div class="box" id="box">
<div class="dot rotate" id="rotate"></div>
<div class="dot left-top" id="left-top"></div>
<div class="dot left-bottom" id="left-bottom"></div>
<div class="dot top-mid" id="top-mid"></div>
<div class="dot bottom-mid" id="bottom-mid"></div>
<div class="dot left-mid" id="left-mid"></div>
<div class="dot right-mid" id="right-mid"></div>
<div class="dot right-bottom" id="right-bottom"></div>
<div class="dot right-top" id="right-top"></div>
<div class="rotate-link"></div>
</div>
</div>
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