Slow kinetic.js drawing in Firefox

Question

i have some problems with Kinetic.js (5.0.1) in Debian with firefox (in Windows works well, in chromium works well). I'm trying to do a drawing board but is very slow. Any solution to improve performance?

Thank you.

PD: here is my code.

var initializeDrawings = function() {
    var myExistingLine;
    var currentLine = [];
    var mouseDrag = false;
    var stage;
    var background;
    var backgroundlayer = new Kinetic.Layer();
    var mylayer = new Kinetic.Layer();
    var lineColor = 'black';
    var lineWeight = 5;
    var allmoves = [];
    // Create an invisible shape that will act as an event listener
    stage = new Kinetic.Stage({
        container: 'container',
        width: 600,
        height: 600
    });
    var imageObj = new Image();
    imageObj.onload = function() {
        background = new Kinetic.Image({
            width: stage.getWidth(),
            height: stage.getHeight(),
            image: imageObj
        });
        // Attach handlers
        background.on('mousedown touchstart', function(e) {
            var position = getPosition("container", e);
            mouseDrag = true;
            myExistingLine = new Kinetic.Line({stroke: lineColor, strokeWidth: lineWeight});
            mylayer.add(myExistingLine);
            currentLine.push(position.x);
            currentLine.push(position.y);
        });
        background.on('mousemove touchmove', function(e) {
            if(mouseDrag === true) {
                var position = getPosition("container", e);
                currentLine.push(position.x);
                currentLine.push(position.y);
                myExistingLine.setPoints(currentLine);
                mylayer.batchDraw();
            }
        });
        background.on('mouseup touchstop', function(e) {
            allmoves.push ({ color: lineColor, grosor: lineWeight, points: currentLine });
            mouseDrag = false;
            currentLine = [];
        });
        stage.add(backgroundlayer.add(background));
        stage.add(mylayer);
    }
    imageObj.src = "summoners-map.png";
};

markE markE · Accepted Answer · 2014-03-25T16:06:48

Use mylayer.batchDraw instead of mylayer.drawScene.

batchDraw redraws your line only once per refresh cycle instead of attempting many redraws.

...And, don't do console.log in an active event handler like mousemove.

Slow kinetic.js drawing in Firefox

1 Answers