Sunday 8 November 2020

Creating a resizable/draggable/rotate view in javascript

I've been trying to create something like this in Javascript:

enter image description here

As you can see, the container can be dragged, rotated and resized. Most of the things work fine but the resizing of container when it is rotated produce weird output.

I expect this to happen:

enter image description here

Instead I get this:

enter image description here

Here's the full code:

https://jsfiddle.net/c0krownz/

or,

var box = document.getElementById("box");
var boxWrapper = document.getElementById("box-wrapper");

var initX, initY, mousePressX, mousePressY, initW, initH, initRotate;

function repositionElement(x, y) {
    boxWrapper.style.left = x;
    boxWrapper.style.top = y;
}

function resize(w, h) {
    box.style.width = w + 'px';
    box.style.height = h + 'px';
    boxWrapper.style.width = w;
    boxWrapper.style.height = h;
}


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) + 'px',
            initY + (event.clientY - mousePressY) + 'px');
    }

    boxWrapper.addEventListener('mousemove', eventMoveHandler, false);

    window.addEventListener('mouseup', function () {
        boxWrapper.removeEventListener('mousemove', eventMoveHandler, false);
    }, 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);

    function eventMoveHandler(event) {
        var wDiff = event.clientX - mousePressX;
        var hDiff = event.clientY - mousePressY;

        var newW = initW, newH = initH, newX = initX, newY = initY;

        if (xResize) {
            if (left) {
                newW = initW - wDiff;
                newX = initX + wDiff;
            } else {
                newW = initW + wDiff;
            }
        }

        if (yResize) {
            if (top) {
                newH = initH - hDiff;
                newY = initY + hDiff;
            } else {
                newH = initH + hDiff;
            }
        }

        resize(newW, newH);
        repositionElement(newX, newY);
    }

    window.addEventListener('mousemove', eventMoveHandler, false);

    window.addEventListener('mouseup', function () {
        window.removeEventListener('mousemove', eventMoveHandler, false);
    }, 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 () {
        window.removeEventListener('mousemove', eventMoveHandler, false);
    }, false);

}, false);



resize(300, 200);
repositionElement(100, 100);
.box {
    background-color: #00BCD4;
    position: relative;
    user-select: none;
}

.box-wrapper {
    position: absolute;
    transform-origin: center center;
    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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