ringo-j2d-example.js

// start w/ ringo-web j2d

// j2d/config.js

exports.urls = [['/', 'actions']];
exports.app = require("ringo/webapp").handleRequest;

// j2d/actions.js

import("binary");

var awt = java.awt;

function Canvas(w, h) {
    this.image = new awt.image.BufferedImage(
        w, h,
        BufferedImage.TYPE_INT_ARGB
    );
    this.graphics = this.image.createGraphics();
    this.graphics.setRenderingHint(
        awt.RenderingHints.KEY_ANTIALIASING,
        awt.RenderingHints.VALUE_ANTIALIAS_ON
    );
    this.graphics.setRenderingHint(
        awt.RenderingHints.KEY_RENDERING,
        awt.RenderingHints.VALUE_RENDER_QUALITY
    );
}

function ImageResponse(image, format, contentType) {
    var format = format || "png";
    var contentType = contentType || "image/" + format;
    var out = new java.io.ByteArrayOutputStream();
    Packages.javax.imageio.ImageIO.write(image, format, out);
    return {
        status: 200, 
        headers: {"Content-Type": contentType}, 
        body: [new binary.ByteArray(out.toByteArray())]
    };
}

exports.index = function(req) {
    var {image, graphics} = new Canvas(100, 100);
    with (graphics) {
        setStroke(new awt.BasicStroke(5));
        setColor(awt.Color.red);
        drawLine(10, 10, 90, 90);
        drawLine(10, 90, 90, 10);
    }
    return new ImageResponse(image, "png");
};