Unity game Development Math and Physics 1 (object extension horizontal direction movement)

Movement of objects in horizontal direction

project implementation should pay attention to:
-Camera Settings Projection orthographic
-Start () and Update () execution order and number of executions
-Conversion of screen coordinates and spatial coordinates
-About Time.deltatime
-X + = V; v =-V;

usingUnityengine;usingSystem.Collections;//Uniform motion Public classUnirormmotiontest:monobehaviour {//Position of object    floatPosX =0;//speed of the object in the x direction    floatSpeed =3;//The top right pixel of the screen in world space coordinatesVector3 Screenrighttoppos;//The left lower pixel of the screen in world space coordinatesVector3 Screenleftbottompos;half width of//box    floatBoxhalfwidth;//Screen coordinates    //+-----------+ (screen.width, screen.height)    //| |    //| Screen |    //| |    //+-----------+    //(0, 0)    voidStart () {//Convert the pixel on the right of the screen to the coordinates of world spaceScreenrighttoppos = Camera.main.ScreenToWorldPoint (NewVector3 (Screen.width, Screen.height,0));//Convert the pixel at the bottom right of the screen to the coordinates of world spaceScreenleftbottompos = Camera.main.ScreenToWorldPoint (NewVector3 (0,0,0));half width of//boxBoxhalfwidth = transform.localscale.x *0.5F }voidUpdate () {if(transform.localposition.x + boxhalfwidth > screenrighttoppos.x | | transform.localposition.x-boxhalfwidth < screenleftbottompos.x) {//Change DirectionSpeed =-speed;        } PosX + = speed * time.deltatime; Transform.localposition =NewVector3 (PosX,0.5F0); }}

Unity game Development Math and Physics 1 (object extension horizontal direction movement)