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Creating a resizable/draggable/rotate view in javascript

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

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:

Instead I get this:

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>

over 4 years ago · Santiago Trujillo

1 answers

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Answer 1 · 2022-04-08T13:15:46.354Z

While it is a good exercise to understand basics of shape transformation, you don't have to do it fortunately as this is already a solved problem. I believe Steve already added fix for issue in your existing code but I would recommend to use existing solution such as konvajs as opposed to reinventing the wheel.

var width = window.innerWidth;
var height = window.innerHeight;
var stage = new Konva.Stage({
  container: 'container',
  width: width,
  height: height,
});

var layer = new Konva.Layer();
stage.add(layer);

var rect1 = new Konva.Rect({
  x: 60,
  y: 60,
  width: 100,
  height: 90,
  fill: 'red',
  name: 'rect',
  draggable: true,
});
layer.add(rect1);

var tr = new Konva.Transformer();
layer.add(tr);
tr.nodes([rect1]);
layer.draw();

#container {
  border:1px solid black;
  width: 100%;
  height: 100%;
}

<script src="https://unpkg.com/konva@7.1.4/konva.min.js"></script>
<h1>Resizable shape</h1>
<div id="container"></div>

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Creating a resizable/draggable/rotate view in javascript

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Andres GPT