SupraLibrix/index.html at master · dlabz/SupraLibrix · GitHub

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<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-height,user-scalable=no">

<head>
    <style>
        .supra-gradient {
            -webkit-overflow-scrolling: touch;
            background-image:
                linear-gradient(to top, black 20%, transparent, white 80%),
                linear-gradient(to right, Red, Orange, Yellow, Green, Blue, Purple, Indigo);
        }
    </style>
</head>

<body>
    <svg width="400" height="300" class="supra-gradient" viewBox="-200 -150 400 300" xmlns="http://www.w3.org/2000/svg"
        xmlns:xlink="http://www.w3.org/1999/xlink" onload="makeDraggable(evt)">
        <style>
            .static {
                cursor: not-allowed;
            }

            .draggable {
                cursor: move;
            }
        </style>
        <script type="text/javascript">
            //<![CDATA[
            function makeDraggable(evt) {
                var svg = evt.target;

                svg.addEventListener('mousedown', startDrag);
                svg.addEventListener('mousemove', drag);
                svg.addEventListener('mouseup', endDrag);
                svg.addEventListener('mouseleave', endDrag);
                svg.addEventListener('touchstart', startDrag);
                svg.addEventListener('touchmove', drag);
                svg.addEventListener('touchend', endDrag);
                svg.addEventListener('touchleave', endDrag);
                svg.addEventListener('touchcancel', endDrag);

                var selectedElement, offset, transform,
                    bbox, minX, maxX, minY, maxY, confined;

                var boundaryX1 = 20;
                var boundaryX2 = 180;
                var boundaryY1 = -130;
                var boundaryY2 = 130;

                function getMousePosition(evt) {
                    var CTM = svg.getScreenCTM();
                    if (evt.touches) { evt = evt.touches[0]; }
                    return {
                        x: (evt.clientX - CTM.e) / CTM.a,
                        y: (evt.clientY - CTM.f) / CTM.d
                    };
                }

                function startDrag(evt) {
                    if (evt.target.classList.contains('draggable')) {
                        selectedElement = evt.target;
                        offset = getMousePosition(evt);

                        // Make sure the first transform on the element is a translate transform
                        var transforms = selectedElement.transform.baseVal;

                        if (transforms.length === 0 || transforms.getItem(0).type !== SVGTransform.SVG_TRANSFORM_TRANSLATE) {
                            // Create an transform that translates by (0, 0)
                            var translate = svg.createSVGTransform();
                            translate.setTranslate(0, 0);
                            selectedElement.transform.baseVal.insertItemBefore(translate, 0);
                        }

                        // Get initial translation
                        transform = transforms.getItem(0);
                        offset.x -= transform.matrix.e;
                        offset.y -= transform.matrix.f;

                        confined = evt.target.classList.contains('confine');
                        if (confined) {
                            bbox = selectedElement.getBBox();
                            minX = boundaryX1 - bbox.x;
                            maxX = boundaryX2 - bbox.x - bbox.width;
                            minY = boundaryY1 - bbox.y;
                            maxY = boundaryY2 - bbox.y - bbox.height;
                        }
                    }
                }

                function drag(evt) {

                    if (selectedElement) {

                        evt.preventDefault();

                        var coord = getMousePosition(evt);
                        var dx = coord.x - offset.x;
                        var dy = coord.y - offset.y;

                        if (confined) {
                            if (dx < minX) { dx = minX; }
                            else if (dx > maxX) { dx = maxX; }
                            if (dy < minY) { dy = minY; }
                            else if (dy > maxY) { dy = maxY; }
                        }

                        transform.setTranslate(dx, dy);
                        moveLine(evt, dx, dy)


                    }
                }

                function endDrag(evt) {
                    selectedElement = false;
                }

                function moveLine(evt, dx, dy) {

                    switch (evt.target.id) {
                        case "Ip":
                            document.querySelector("#IxIp").setAttribute('x1', dx)
                            document.querySelector("#IxIp").setAttribute('y1', dy + 30)
                            break;

                        case "Ix":
                            document.querySelector("#IxIp").setAttribute('x2', dx)
                            document.querySelector("#IxIp").setAttribute('y2', dy)
                            break;
                    }

                }
            }
            //]]>
        </script>
        <defs>
            <symbol id="Me" viewBox="0 0 30 90" preserveAspectRatio="xMidYMid meet">
                <rect x="1" y="61" width="28" height="28" />
                <circle r="14" cx="15" cy="15" />
                <line x1="15" y1="15" x2="15" y2="75" />
            </symbol>

            <symbol id="We" viewBox="0 0 90 120" preserveAspectRatio="xMidYMid meet">
                <rect x="1" y="61" width="28" height="28" />
                <circle r="14" cx="15" cy="15" />
                <line x1="15" y1="15" x2="15" y2="75" />

                <rect x="31" y="91" width="28" height="28" />
                <circle r="14" cx="45" cy="45" />
                <line x1="45" y1="45" x2="45" y2="105" />

                <rect x="61" y="61" width="28" height="28" />
                <circle r="14" cx="75" cy="15" />
                <line x1="75" y1="15" x2="75" y2="75" />
            </symbol>
        </defs>

        <use x="-190" y="110" width="10" height="30" xlink:href="#Me" fill="white" stroke="white" />
        <use x="160" y="-150" width="30" height="40" xlink:href="#We" fill="black" stroke="black" />

        <line id="IxIp" x1="0" y1="0" x2="0" y2="30" stroke="black" />
        <rect class="draggable" id="Ix" transform="translate(0 30)" x="-14" y="1" width="28" height="28"
            stroke="white" />
        <circle class="draggable" id="Ip" transform="translate(0 -30)" r="14" cx="1" cy="15" stroke="white" />
    </svg>
</body>

</html>