H2D Introduction

Introduction

The smallest code for a Heaps application is the following:

class Main extends hxd.App {
    static function main() {
        new Main();
    }
    public function new() {super();}
}

Creating content

Of course all you get to see here is a black screen or window with no content. Thus to create content an object instance must be added that inherits from h2d.Object. There are many classes to choose from that all inherit from h2d.Object (see the API). Therefore in the next sample we revisit the code of the ["Hello World" sample](Hello World) and add a bitmap. Two objects now make up the content here: h2d.Text and h2d.Bitmap (and as said, both are h2d.Objects).

    class Main extends hxd.App {
        var bmp : h2d.Bitmap;
        override function init() {
            var tf = new h2d.Text(hxd.res.DefaultFont.get(), s2d);
            tf.text = "Hello World !";

            // allocate a Texture with red color and creates a 100x100 Tile from it
            var tile = h2d.Tile.fromColor(0xFF0000, 100, 100);
            // create a Bitmap object, which will display the tile
            // and will be added to our 2D scene (s2d)
            bmp = new h2d.Bitmap(tile, s2d);
            // modify the display position of the Bitmap sprite
            bmp.x = s2d.width * 0.5;
            bmp.y = s2d.height * 0.5;
        }
        // on each frame
        override function update(dt:Float) {
            // increment the display bitmap rotation by 0.1 radians
            bmp.rotation += 0.1;
        }
        static function main() {
            new Main();
        }
    }

With overriding hxd.App's update method Heaps allows us to define what should happen each frame. The underlying h2d.Object provides us with the basics to change the bitmaps position and rotation.

(h2d.Tile will be discussed later in another section.)