unity 3D游戏开场画面隐退实现

//////////////2015/07/07//////////

/////////////by xbw/////////////////

////////////环境 unity 4.6.1////

今天实现了游戏欢迎界面的制作，先上效果图，

想必大家都玩过游戏，经过一个欢迎界面后会进入游戏，这就是我们今天要实现的；

、、、、、

这个我把他新建了一个场景，可以不用新建场景，直接把代码挂载到主摄像机上，下面直接上代码吧；

用的Java语言；

welcome代码

var renderOverlay : DisplayTextureFullScreen;

function Start() {

    renderOverlay = GetComponent(DisplayTextureFullScreen);
    renderOverlay.setStartColor(Color.white);
    renderOverlay.setDelay(2.0);
}

function Update () {

    if (renderOverlay.GUIColor.a > 0) {
        renderOverlay.AlphaDown(Time.deltaTime);
    }
}

DisplayTextureFullScreen代码

var graphic = TextureGUI(); //(28,23);
var GUIColor:Color;

function OnGUI() {
    GUI.color = GUIColor;
    if (graphic.texture) {
        GUI.DrawTexture(Rect(graphic.offset.x,graphic.offset.y,
						Screen.width,Screen.height),
						graphic.texture,ScaleMode.StretchToFill,true);
    }
}

function AlphaUp(change:float) {
    GUIColor.a += change;
}

    function setStartColor(color:Color) {
        GUIColor = color;
    }

        function setDelay(delay:float) {
            if (GUIColor.a > .5) {
                GUIColor.a += delay;
            } else {
                GUIColor.a -= delay;
            }
        }

            function AlphaDown(change:float) {
                GUIColor.a -= change;
            }

这两个代码需要一个类库，

class类；

import System.Collections.Generic;

// TextureGUI Class: create a basic class for creating and placing GUI elements
// texture = the texture to display
// offset = pixel offset from top left corner, can be modified for easy positioning

class TextureGUI {
    var texture:Texture; //useful: texture.width, texture.height
    var offset:Vector2; // .x and .y
    private var originalOffset:Vector2; //store the original to correctly reset anchor point
	enum Point { TopLeft, TopRight, BottomLeft, BottomRight, Center} //what part of texture to position around?

    var anchorPoint = Point.TopLeft; // Unity default is from top left corner of texture

    function setAnchor() { // meant to be run ONCE at Start.
        originalOffset = offset;
        if (texture) { // check for null texture
            switch(anchorPoint) { //depending on where we want to center our offsets
                case anchorPoint.TopLeft: // Unity default, do nothing
                    break;
                case anchorPoint.TopRight: // Take the offset and go to the top right corner
                    offset.x = originalOffset.x - texture.width;
                    break;

                case anchorPoint.BottomLeft: // bottom left corner of texture
                    offset.y = originalOffset.y - texture.height;
                    break;

                case anchorPoint.BottomRight: //bottom right corner of texture
                    offset.x = originalOffset.x - texture.width;
                    offset.y = originalOffset.y - texture.height;
                    break;

                case anchorPoint.Center: //and the center of the texture (useful for screen center textures)
                    offset.x = originalOffset.x - texture.width/2;
                    offset.y = originalOffset.y - texture.height/2;
                    break;
            }
        }
    }
}

//Timer Class:

class TimerGUI extends TextureGUI { // Extend functionality from TextureGUI for a depreciating timer graphic
    var textureLEnd:Texture; // left side of full texture (non stretching part)
    var offsetLEnd:Vector2; // left side of full texture (non stretching part) start position
    var textureCenter:Texture; // center of timer (will be stretched across width)
    var offsetCenter:Vector2;
    var textureREnd:Texture;
    var offsetREnd:Vector2;
    var timerPerct:float = 1; // percentage (0 to 1) this stretches the center
    var desiredWidth:float = 403; // max width of the timer in pixels

    function setTime(newTime:float) {
        timerPerct = newTime; // sets the percent based on value
    }
    }

    // SwitchGUI Class: Extends the TextureGUI to be able to load in multiple textures and switch between them
class SwitchGUI extends TextureGUI {
    var switchableTextures = new List.<Texture>();
    var currentTexture:int = 0;
    function Start() {
        if (switchableTextures.Count > 0) {
            texture = switchableTextures[currentTexture];
        }
    }
    function changeTexture(switchTo:int) {
        if (switchTo < switchableTextures.Count && switchTo >= 0) {
            texture = switchableTextures[switchTo];
            currentTexture = switchTo;
        } else {
            //Debug.Log( this + ": tried to call invalid part of switchTextures array!");
        }
    }

        function up() {
            if ((currentTexture+1) < switchableTextures.Count) {
                ++currentTexture;
                texture = switchableTextures[currentTexture];
            } else {
                //Debug.Log( this + ": at the top!");
            }
        }

        function nextTexture() {
            if ((currentTexture+1) < switchableTextures.Count) { // if we are at the end of the array
                ++currentTexture;
                texture = switchableTextures[currentTexture];
            } else {// loop to the beginning
                currentTexture = 0;
                texture = switchableTextures[currentTexture];
            }
        }

        function down() {
            if ((currentTexture-1) >= 0) {
                --currentTexture;
                texture = switchableTextures[currentTexture];
            } else {
                //Debug.Log( this + ": at the bottom!");
            }
        }

    }

    // Location class: 

class Location {
	enum Point { TopLeft, TopRight, BottomLeft, BottomRight, Center}

    var pointLocation = Point.TopLeft;
    var offset:Vector2;

    function updateLocation() {
        switch(pointLocation) {
            case pointLocation.TopLeft:
                offset = Vector2(0,0);
                break;
            case pointLocation.TopRight:
                offset = Vector2(Screen.width,0);
                break;

            case pointLocation.BottomLeft:
                offset = Vector2(0,Screen.height);
                break;

            case pointLocation.BottomRight:
                offset = Vector2(Screen.width,Screen.height);
                break;

            case pointLocation.Center:
                offset = Vector2(Screen.width/2,Screen.height/2);
                break;
        }
    }
}

class TextureAnchor {
	enum Point { TopLeft, TopRight, BottomLeft, BottomRight, Center}

    var anchorPoint = Point.TopLeft;
    var offset:Vector2;

    function update() {
        switch(anchorPoint) {
            case anchorPoint.TopLeft:
                offset = Vector2(0,0);
                break;
            case anchorPoint.TopRight:
                offset = Vector2(Screen.width,0);
                break;

            case anchorPoint.BottomLeft:
                offset = Vector2(0,Screen.height);
                break;

            case anchorPoint.BottomRight:
                offset = Vector2(Screen.width,Screen.height);
                break;

            case anchorPoint.Center:
                offset = Vector2(Screen.width/2,Screen.height/2);
                break;
        }
    }
}

class类不需要挂载，两外两个代码挂载到主摄像机，

红色圈中为需要设置的贴图，即欢迎图片；；；，

试一下效果吧；；；

这是在同一个场景中的，我见了两个场景，这就需要场景转换了，

下节介绍，，欢迎同学互相学习交流，



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