github.com/EngineerKamesh/gofullstack@v0.0.0-20180609171605-d41341d7d4ee/volume3/section2/3dgopher/3dgopherresize/3dgopherresize.go (about)

     1  package main
     2  
     3  import (
     4  	"math"
     5  
     6  	"github.com/gopherjs/gopherjs/js"
     7  	"honnef.co/go/js/dom"
     8  )
     9  
    10  var JS = js.Global
    11  var D = dom.GetWindow().Document()
    12  
    13  var container *dom.HTMLDivElement
    14  var camera *js.Object
    15  var cameraTarget *js.Object
    16  var scene *js.Object
    17  var renderer *js.Object
    18  var gopher *js.Object
    19  
    20  type MeshPhongMaterialData struct {
    21  	*js.Object
    22  	Color     int `js:"color"`
    23  	Specular  int `js:"specular"`
    24  	Shininess int `js:"shininess"`
    25  }
    26  
    27  func main() {
    28  	println("Hello 3D Gopher!")
    29  
    30  	dom.GetWindow().AddEventListener("resize", false, func(event dom.Event) {
    31  		handleWindowResize()
    32  	})
    33  
    34  	initialize()
    35  	animate()
    36  }
    37  
    38  func initialize() {
    39  
    40  	container = D.CreateElement("div").(*dom.HTMLDivElement)
    41  	D.QuerySelector("body").AppendChild(container)
    42  
    43  	camera = JS.Get("THREE").Get("PerspectiveCamera").New(39, JS.Get("window").Get("innerWidth").Int()/JS.Get("window").Get("innerHeight").Int(), 1, 15)
    44  	camera.Get("position").Call("set", 6, 0.54, 6)
    45  	cameraTarget = JS.Get("THREE").Get("Vector3").New(0, 0, 0)
    46  	scene = JS.Get("THREE").Get("Scene").New()
    47  
    48  	fog := JS.Get("THREE").Get("Fog").New(0x708090, 2, 15)
    49  	scene.Set("fog", fog)
    50  
    51  	planeMeshData := &MeshPhongMaterialData{Object: js.Global.Get("Object").New()}
    52  	planeMeshData.Color = 0xA9A9A9
    53  	planeMeshData.Specular = 0x000000
    54  
    55  	planeMeshPhongMaterial := JS.Get("THREE").Get("MeshPhongMaterial").New(planeMeshData)
    56  	planeBufferGeometry := JS.Get("THREE").Get("PlaneBufferGeometry").New(40, 40)
    57  	plane := JS.Get("THREE").Get("Mesh").New(planeBufferGeometry, planeMeshPhongMaterial)
    58  
    59  	plane.Get("rotation").Set("x", -1*(math.Pi/2))
    60  	plane.Get("position").Set("y", -0.5)
    61  
    62  	scene.Call("add", plane)
    63  
    64  	loader := JS.Get("THREE").Get("OBJLoader").New()
    65  	loader.Call("load", "/obj/gogopher.obj", func(mesh *js.Object) {
    66  
    67  		mesh.Get("position").Call("set", 0.06, -0.45, 0.7)
    68  		mesh.Get("scale").Call("set", 0.004, 0.0054, 0.004)
    69  		mesh.Set("castsShadow", true)
    70  		mesh.Set("receiveShadow", true)
    71  
    72  		scene.Call("add", mesh)
    73  
    74  	})
    75  
    76  	hemisphereLight := JS.Get("THREE").Get("HemisphereLight").New(0xf0f0f0, 0x000000)
    77  	scene.Call("add", hemisphereLight)
    78  	addDirectionalLight(-0.5, 3, -1.0, 0xf0f0f0, 1)
    79  	renderer = JS.Get("THREE").Get("WebGLRenderer").New()
    80  	renderer.Call("setClearColor", scene.Get("fog").Get("color"))
    81  	renderer.Call("setPixelRatio", JS.Get("window").Get("devicePixelRatio"))
    82  	renderer.Call("setSize", JS.Get("window").Get("innerWidth").Int(), JS.Get("window").Get("innerHeight").Int())
    83  	renderer.Set("gammaInput", true)
    84  	renderer.Set("gammaOutput", true)
    85  	renderer.Get("shadowMap").Set("enabled", true)
    86  	renderer.Get("shadowMap").Set("renderReverseSided", false)
    87  	container.Underlying().Call("appendChild", renderer.Get("domElement"))
    88  }
    89  
    90  func animate() {
    91  	JS.Get("window").Call("requestAnimationFrame", animate)
    92  	render()
    93  }
    94  
    95  func render() {
    96  	camera.Call("lookAt", cameraTarget)
    97  	renderer.Call("render", scene, camera)
    98  }
    99  
   100  func addDirectionalLight(x float64, y float64, z float64, color int, intensity int) {
   101  	directionalLight := JS.Get("THREE").Get("DirectionalLight").New(color, intensity)
   102  	directionalLight.Get("position").Call("set", x, y, z)
   103  	scene.Call("add", directionalLight)
   104  	directionalLight.Set("castShadow", true)
   105  	d := 1
   106  	directionalLight.Get("shadow").Get("camera").Set("left", -d)
   107  	directionalLight.Get("shadow").Get("camera").Set("right", d)
   108  	directionalLight.Get("shadow").Get("camera").Set("top", d)
   109  	directionalLight.Get("shadow").Get("camera").Set("bottom", -d)
   110  	directionalLight.Get("shadow").Get("camera").Set("near", 1)
   111  	directionalLight.Get("shadow").Get("camera").Set("far", 4)
   112  	directionalLight.Get("shadow").Get("mapSize").Set("width", 1024)
   113  	directionalLight.Get("shadow").Get("mapSize").Set("height", 1024)
   114  	directionalLight.Get("shadow").Set("bias", -0.005)
   115  }
   116  
   117  func handleWindowResize() {
   118  	camera.Set("aspect", JS.Get("window").Get("innerWidth").Int()/JS.Get("window").Get("innerHeight").Int())
   119  	camera.Call("updateProjectionMatrix")
   120  	renderer.Call("setSize", JS.Get("window").Get("innerWidth").Int(), JS.Get("window").Get("innerHeight").Int())
   121  }