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Java example source code file (renderFlow.js)

This example Java source code file (renderFlow.js) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

canvas, date, deeplearning4j, layers, roboto, uiserver, yyyy

The renderFlow.js Java example source code

/*
    Here we receive simplified model description, and render it on page.
*/

var nodeWidth = 150;
var nodeHeight = 100;

var offsetVertical = 100;
var offsetHorizontal = 10;

// canvas width
var width = 900;

var arrow = [
    [ 2, 0 ],
    [ -10, -4 ],
    [ -10, 4]
];

var layers = new Layers();

function drawFilledPolygon(ctx, shape) {
    ctx.beginPath();
    ctx.moveTo(shape[0][0],shape[0][1]);

    for(p in shape)
        if (p > 0) ctx.lineTo(shape[p][0],shape[p][1]);

    ctx.lineTo(shape[0][0],shape[0][1]);
    ctx.fill();
};

function translateShape(shape,x,y) {
    var rv = [];
    for(p in shape)
        rv.push([ shape[p][0] + x, shape[p][1] + y ]);
    return rv;
};

function rotateShape(shape,ang) {
    var rv = [];
    for(p in shape)
        rv.push(rotatePoint(ang,shape[p][0],shape[p][1]));
    return rv;
};
function rotatePoint(ang,x,y) {
    return [
        (x * Math.cos(ang)) - (y * Math.sin(ang)),
        (x * Math.sin(ang)) + (y * Math.cos(ang))
    ];
};

function drawLineArrow(ctx, x1,y1,x2,y2) {
    ctx.beginPath();
    ctx.moveTo(x1,y1);
    ctx.lineTo(x2,y2);
    ctx.stroke();
    var ang = Math.atan2(y2-y1,x2-x1);
    drawFilledPolygon(ctx, translateShape(rotateShape(arrow,ang),x2,y2));
};

function drawIntraLayerArrow(ctx, x1, y1, x2, y2) {
    ctx.beginPath();
    ctx.moveTo(x1,y1);
    ctx.bezierCurveTo(x1 + 10, y1 - (offsetVertical / 4), x2 - 10, y2 - (offsetVertical / 4), x2,y2);
    ctx.stroke();
    var ang = 0.9;
    drawFilledPolygon(ctx, translateShape(rotateShape(arrow,ang),x2,y2));
}

/*
    This method draws connections from each node, to all nodes it's connected to
*/
function renderConnections(ctx, layer) {
    for (var c = 0; c < layer.connections.length; c++) {
        var connection = layer.connections[c];
        if (connection.y == layer.y + 1) {
            // this is direct connection to the next layer, draw straight line
            var cX1 = getNodeX(layer.x, layer.y, layers.getLayersForY(layer.y).length) + (nodeWidth / 2);
            var cY1 = getNodeY(layer.x, layer.y) + nodeHeight + 5;

            var cX2 = getNodeX(connection.x, connection.y, layers.getLayersForY(connection.y).length)  + (nodeWidth / 2);
            var cY2 = getNodeY(connection.x, connection.y) - 5;

            drawLineArrow(ctx, cX1, cY1, cX2, cY2);
        } else if (connection.y == layer.y -1 ) {
            // this is direct connection to the previous layer, draw straight line
            var cX1 = getNodeX(layer.x, layer.y, layers.getLayersForY(layer.y).length) + (nodeWidth / 2);
            var cY1 = getNodeY(layer.x, layer.y) - 5;

            var cX2 = getNodeX(connection.x, connection.y, layers.getLayersForY(connection.y).length)  + (nodeWidth / 2);
            var cY2 = getNodeY(connection.x, connection.y) + nodeHeight + 5;

            drawLineArrow(ctx, cX1, cY1, cX2, cY2);
        } else if (connection.y == layer.y) {
            // this is connection withing same layer, bezier curve required
            if (layer.x < connection.x) {
                var cX1 = getNodeX(layer.x, layer.y, layers.getLayersForY(layer.y).length) + (nodeWidth / 2) + 20;
                var cY1 = getNodeY(layer.x, layer.y) - 5;

                var cX2 = getNodeX(connection.x, connection.y, layers.getLayersForY(layer.y).length) + (nodeWidth / 2) - 20;
                var cY2 = getNodeY(connection.x, connection.y) - 5;


                drawIntraLayerArrow(ctx, cX1, cY1, cX2, cY2);
            } else {
                var cX1 = getNodeX(layer.x, layer.y, layers.getLayersForY(layer.y).length) + (nodeWidth / 2) - 20;
                var cY1 = getNodeY(layer.x, layer.y) - 5;

                var cX2 = getNodeX(connection.x, connection.y, layers.getLayersForY(layer.y).length) + (nodeWidth / 2) + 20;
                var cY2 = getNodeY(connection.x, connection.y) - 5;


                drawIntraLayerArrow(ctx, cX1, cY1, cX2, cY2);
            }
        } else {
            // this is indirect connection, curve required
        }
    }
}

/*
    This method renders single specified grid
*/
function renderGrid(ctx, array, y) {
    var totalOnLayer = array.length;
    for (var x = 0; x < totalOnLayer; x++) {
        layer = layers.getLayerForYX(x, y);

        renderNode(ctx, layer, x, y, totalOnLayer );
        renderConnections(ctx, layer);
    }
}

/*
    This method returns proper X coordinates for specific X and Y position
*/
function getNodeX(x, y, totalOnLayer) {
    /*
        We want whole layer to be aligned to center nicely
    */

    var layerWidth = totalOnLayer * (nodeWidth + offsetHorizontal);
    var zeroX = (width / 2) - (layerWidth / 2);

    var cX = zeroX + ((nodeWidth + offsetHorizontal) * x);

    return cX;
}

function getNodeY(x, y) {
    return  ((nodeHeight + offsetVertical) * y) + 1;
}

/*
    This method renders single node
*/
function renderNode(ctx, layer, x, y, totalOnLayer) {
    var cx = getNodeX(x, y, totalOnLayer);
    var cy = getNodeY(x, y);


    // draw node rect
    ctx.beginPath();
    ctx.lineWidth = "1";
    ctx.fillStyle = layer.color;
    ctx.rect(cx, cy, nodeWidth, nodeHeight);
    ctx.fillRect(cx+1, cy+1, nodeWidth-2, nodeHeight-2);
//    console.log("cX: " + cx + " cY: " + cy + " width: " + nodeWidth + " height: " + nodeHeight);
    ctx.stroke();

    // draw description
    ctx.fillStyle = "#000000";
    ctx.font = "15px Roboto";
    ctx.textAlign="center";
    ctx.fillText(layer.name, cx + (nodeWidth / 2), cy + 20, nodeWidth - 10);

    ctx.font = "12px Roboto";
    ctx.fillText(layer.mainLine, cx + (nodeWidth / 2), cy + 45, (nodeWidth - 10));
    ctx.font = "11px Roboto";
    ctx.fillText(layer.subLine, cx + (nodeWidth / 2), cy + 70, (nodeWidth - 10));
}

function renderLayers(container, layers) {
    $("#" + container).html("");

    // define grid parameters
    var canvasHeight = (nodeHeight * (layers.maximumY + 3)) + (offsetVertical * layers.maximumY) ;

    $("#" + container).html("<canvas id='flowCanvas' width=900 height="+ canvasHeight +" >Canvas isn't supported on your browser");

    var c=document.getElementById("flowCanvas");
    var ctx=c.getContext("2d");

    for (var y = 0; y <= layers.maximumY; y++) {

        var yLayers = layers.getLayersForY(y);
        renderGrid(ctx, yLayers, y);
    }


}

function timedFunction() {

     var sid = getParameterByName("sid");
     if (sid == undefined) sid = 0;

     $.ajax({
                            url:"/flow" + "/state?sid=" + sid,
                            async: true,
                            error: function (query, status, error) {
                                $.notify({
                                    title: '<strong>No connection!',
                                    message: 'DeepLearning4j UiServer seems to be down!'
                                },{
                                    type: 'danger',
                                    placement: {
                                        from: "top",
                                        align: "center"
                                        },
                                });
                                setTimeout(timedFunction, 5000);
                            },
                            success: function( data ) {
                                // parse & render ModelInfo
                                //console.log("data received: " + data);

                                var updateTime = data['time'];
                                var time = new Date(updateTime);
                                $('#updatetime').html(time.customFormat("#DD#/#MM#/#YYYY# #hhh#:#mm#:#ss#"));

                                if (typeof data.layers == 'undefined') return;

                                layers = new Layers();

                                /*
                                    At this point we're going to have array of objects, with some properties tied.
                                    Rendering will be using pseudo-grid, derived from original layers connections
                                */
                                for (var i = 0; i < data.layers.length; i++) {
                                    var layer = new Layer(data.layers[i]);
                                    layers.attach(layer);
                                }
                                renderLayers("display", layers);
                            }
              });

}

//$(window).load(setTimeout(timedFunction,2000));
setTimeout(timedFunction,2000)

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