adventure

README

Adventure Demo

What does it do?

• It applies various different things from multiple engo demos
• It demonstrates how one can load and render a TMX file created from the TileMap Editor
• It shows how to add a character entity
  • It demonstrates how to animate the character and move it around
• It shows how to access different layers in the TileMap
  • It demonstrates how to set different Z indices to create depth

What are important aspects of the code?

These lines are key in this demo:

• levelData := tmxResource.Level to retrieve the level from the tmx resource
• hero := scene.CreateHero( ... to create a character instance
• hero.ControlComponent = ControlComponent{ ... to add a control component to the character
• for _, tileLayer := range levelData.TileLayers { ... to access different tile layer of the TMX map
• for _, imageLayer := range levelData.ImageLayers { ... to access different image layers of the TMX map
• for _, objectLayer := range levelData.ObjectLayers { ... to access different object layers of the TMX map
• tile.RenderComponent.SetZIndex(3) to add a Z index and 'depth' to one layer

Add render and space components to each tile in each tile layer

for _, tileLayer := range levelData.TileLayers {
    for _, tileElement := range tileLayer.Tiles {

        if tileElement.Image != nil {
            tile := &Tile{BasicEntity: ecs.NewBasic()}
            tile.RenderComponent = common.RenderComponent{
                Drawable: tileElement,
                Scale:    engo.Point{1, 1},
            }
            tile.SpaceComponent = common.SpaceComponent{
                Position: tileElement.Point,
                Width:    0,
                Height:   0,
            }

            if tileLayer.Name == "grass" {
                tile.RenderComponent.SetZIndex(0)
            }

            if tileLayer.Name == "trees" {
                tile.RenderComponent.SetZIndex(2)
            }

            tileComponents = append(tileComponents, tile)
        }
    }
}

Add render and space components to each image in each image layer

for _, imageLayer := range levelData.ImageLayers {
    for _, imageElement := range imageLayer.Images {

        if imageElement.Image != nil {
            tile := &Tile{BasicEntity: ecs.NewBasic()}
            tile.RenderComponent = common.RenderComponent{
                Drawable: imageElement,
                Scale:    engo.Point{1, 1},
            }
            tile.SpaceComponent = common.SpaceComponent{
                Position: imageElement.Point,
                Width:    0,
                Height:   0,
            }

            if imageLayer.Name == "clouds" {
                tile.RenderComponent.SetZIndex(3)
            }

            tileComponents = append(tileComponents, tile)
        }
    }
}

Access object layers and do something with its regular and polyline objects

// Access Object Layers
for _, objectLayer := range levelData.ObjectLayers {
    log.Println("This object layer is called " + objectLayer.Name)
    // Do something with every regular Object
    for _, object := range objectLayer.Objects {
        log.Println("This object is called " + object.Name)
    }

    // Do something with every polyline Object
    for _, polylineObject := range objectLayer.PolyObjects {
        log.Println("This object is called " + polylineObject.Name)
    }
}