plot-reverse/index.html at master · mast4461/plot-reverse · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<body>

<script src="http://d3js.org/d3.v3.min.js"></script>
<link type="text/css" rel="stylesheet" href="styles.css"/>

<title>plot-reverse</title>

<section>
    Upload image:<input type='file' onchange="readURL(this);" />
</section>
<section>
    <ul>
        <li>x1:<input id="x1" type="text"/></li>
        <li>x2:<input id="x2" type="text"/></li>
        <li>y1:<input id="y1" type="text"></li>
        <li>y2:<input id="y2" type="text"/></li>
    </ul>
</section>
<section>
    <div id="map"></div>
    <textarea readonly id="output"></textarea>
</section>

<ol>
    <li>Upload image.</li>
    <li>Enter reference values at top.</li>
    <li>Drag reference handles (x1, x2, y1, y2) in place using mouse.</li>
    <li>Add points by alt+click.</li>
</ol>
<ul>
    <li>Pan and zoom using mouse.</li>
    <li>Move points using mouse.</li>
    <li>Remove points by shift+click.</li>
</ul>

<br>
<br>

<p>
    Created by Martin Stålberg, using mainly <a href="https://d3js.org/">D3.js</a>.
    <br>
    Source code available on <a href="https://github.com/mast4461/plot-reverse">GitHub</a>.
</p>

<script>

////////////////////////////////////////////////////////////////////////////
// Functions for loading an image

function readURL(input) {
	// http://jsbin.com/uboqu3/1/edit?html,js,output
	if (input.files && input.files[0]) {
        var reader = new FileReader();

        reader.onload = onload;

        reader.readAsDataURL(input.files[0]);
    }
};

function onload(file) {
    var image = new Image();

    image.onload = function() {
        // imageGroup.append("image")
        imageElement
            .attr("width",  this.width + "px")
            .attr("height", this.height + "px")
            .attr("x", 0 + "px")
            .attr("y", 0 + "px")
            .attr("xlink:href", file.target.result)
        ;

        setScale(Math.min(
            div.node().clientWidth/this.width,
            div.node().clientHeight/this.height
        ));
        resetHandles();
    };

    image.src = file.target.result
};

////////////////////////////////////////////////////////////////////////////
// Creating some elements and objects and storing references in variables

var zoomHandler = d3.behavior.zoom()
    .scaleExtent([0.1, 8])
    .on("zoom", zoom)
;

var outputElement = d3.select("textarea#output");

var inpuxX1 = d3.select("input#x1");
var inputX2 = d3.select("input#x2");
var inputY1 = d3.select("input#y1");
var inputY2 = d3.select("input#y2");

// Let the output update when the input changes
d3.selectAll('input[type=text]').on('input', updateOutput);

var div = d3.select("div#map");
var svg = div.append('svg');
var zoomGroup = svg
    .style("width",  "100%")
    .style("height", "100%")
    .call(zoomHandler)
    .append("g");
;

var imageGroup = zoomGroup.append('g');
var imageElement = imageGroup.append('image');
var overlayGroup = svg.append('g');


var xScale = d3.scale.linear();
var yScale = d3.scale.linear();

zoomHandler.x(xScale)
zoomHandler.y(yScale)


function zoom() {
    // Credit to http://bl.ocks.org/pbogden/7363519
    zoomHandler.scale(d3.event.scale);
    zoomHandler.translate(d3.event.translate);
    scheduleUpdate();
};

function setScale(scale) {
    zoomHandler.scale(scale)
    scheduleUpdate();
};

function updateZoom() {
    zoomGroup.attr(
        'transform',
        'translate(' + zoomHandler.translate() + ')scale(' + zoomHandler.scale() + ')'
    );
};

////////////////////////////////////////////////////////////////////////////
// Functions for updating the graphics, only on frame draw.
// This approach is taken to avoid unneccessary computations,
// the screen only refreshes every so often so we don't need to update
// the graphics more than once per animation frame.

// Keeping track of the current animation frame id
var animationFrameId;
// Update the graphics
function update() {
    updateHandles();
    updatePoints();
    updateOutput();
    updateZoom();
    animationFrameId = undefined;
};

// Schecule update of the graphics
function scheduleUpdate() {
    if (animationFrameId) return;
    animationFrameId = requestAnimationFrame(update);
};

////////////////////////////////////////////////////////////////////////////
// Graphics update functions for separate element categories

// Helper functions
function xFunc(d) { return xScale(d.x); };
function yFunc(d) { return yScale(d.y); };

function updateHandles() {
    handles
        .attr('x', xFunc)
        .attr('y', yFunc)
    ;
};

function updatePoints() {
    var pointMarkers = overlayGroup.selectAll('.point').data(points);

    pointMarkers
        .enter()
        .append('circle')
        .classed('point', true)
        .call(dragPoint)
        .on('click', removePoint)
    ;

    pointMarkers
        .attr('cx', xFunc)
        .attr('cy', yFunc)
        .attr('r', 5)
    ;

    pointMarkers.exit().remove();
};

function updateOutput() {

    var getValue = function(input) {
        return parseFloat(input.node().value);
    };

    var xScale = d3.scale.linear()
        .domain([handlesData[0].x, handlesData[1].x])
        .range([getValue(inpuxX1), getValue(inputX2)])
    ;

    var yScale = d3.scale.linear()
        .domain([handlesData[2].y, handlesData[3].y])
        .range([getValue(inputY1), getValue(inputY2)])
    ;

    var pointsSorted = points.sort(function(a,b) {
        return a.x - b.x;
    });

    var rows = pointsSorted.map(function(point) {
        return [xScale(point.x), yScale(point.y)].join(', ');
    });
    outputElement.node().value = rows.join('\n');
};

////////////////////////////////////////////////////////////////////////////
// User interactions

// Adding and removing points
var points = [];
svg.on('click', function() {
    console.log(d3.event);
    if (d3.event.altKey) {
        points.push({
            x: xScale.invert(d3.event.offsetX),
            y: yScale.invert(d3.event.offsetY)
        });

        scheduleUpdate();
    }
});

function removePoint(d, i) {
    if (d3.event.shiftKey) {
        // Remove point
        points.splice(i, 1);
        scheduleUpdate();
    }
};

// Removing and dragging points
var dragPoint = d3.behavior.drag()
    .on('dragstart', function(d, i) {
        d3.event.sourceEvent.stopPropagation();
    })
    .on('drag', function(d) {
        d.x = xScale.invert(d3.event.x);
        d.y = yScale.invert(d3.event.y);
        scheduleUpdate();
    })
;

// Dragging reference handles
var dragHandle = d3.behavior.drag()
    .on('dragstart', function() {
        d3.event.sourceEvent.stopPropagation();

        // Create ruler lines, visible during dragging
        this.lineX = svg.append('line')
            .attr('x1', "0%")
            .attr('x2', "100%")
            .classed('ruler-line', true)
        ;
        this.lineY = svg.append('line')
            .attr('y1', "0%")
            .attr('y2', "100%")
            .classed('ruler-line', true)
        ;
    })
    .on('drag', function(d) {
        // Update data for handles and ruler lines
        d.x = xScale.invert(d3.event.x);
        d.y = yScale.invert(d3.event.y);

        this.lineX
            .attr('y1', d3.event.y)
            .attr('y2', d3.event.y)
        ;
        this.lineY
            .attr('x1', d3.event.x)
            .attr('x2', d3.event.x)
        ;
        scheduleUpdate();
    })
    .on('dragend', function() {
        // Remove ruler lines
        this.lineX.remove();
        this.lineY.remove();
    })
;
////////////////////////////////////////////////////////////////////////////
// Initialization and other things related to reference handles,
var handlesData = [
    {x0: '0.20', y0: '0.98', label: "x1"},
    {x0: '0.98', y0: '0.98', label: "x2"},
    {x0: '0.10', y0: '0.88', label: "y1"},
    {x0: '0.10', y0: '0.10', label: "y2"}
];

var handles = overlayGroup.selectAll('.ref-handle').data(handlesData);

handles
    .enter()
    .append('text')
    .classed('ref-handle', true)
    .text(function(d) {return d.label;})
    .call(dragHandle)
;

function resetHandles() {
    handles
        .attr('x', function(d) {
            // Get the initial value in relative units
            var x0 = d.x0;
            // Get the screen position in pixel units
            var xScreen = x0*svg.node().clientWidth;
            // Set the position in data units
            d.x = xScale.invert(xScreen);
            // Return screen position
            return xScreen;

        })
        .attr('y', function(d) {
            var y0 = d.y0;

            var yScreen = y0*svg.node().clientHeight;
            d.y = xScale.invert(yScreen);

            return yScreen;
        })
    ;
}
resetHandles();

////////////////////////////////////////////////////////////////////////////
// Load example image and set reference values for it, used during development

onload({
    target: {
        result: "/plot-reverse/example-plot.svg"
    }
});

inpuxX1.node().value = 0;
inputX2.node().value = 10;
inputY1.node().value = 0;
inputY2.node().value = 1;


</script>
</body>