<div id="surface" style="width: 250px; height: 250px;"></div>
<script>
    var draw = kendo.drawing;

    var path = new draw.Path({
        fill: {
            color: "#2ecc71"
        },
        stroke: {
            color: "#27ae60",
            width: 2
        }
    })
    .moveTo(50, 50)
    .lineTo(200, 50)
    .lineTo(125, 200)
    .close();

    // Set opacity using the opacity method
    path.opacity(0.5);

    console.log("Current opacity:", path.opacity());

    var surface = draw.Surface.create($("#surface"));
    surface.draw(path);
</script>