private float screenEdgeHorizontal = 80f; //the distance between the player and the horizontal edge of the screen 80
private float screenEdgeVertical = 18f; //the distance between the player and the vertical edge of the screen
//keep the player within camera view
void KeepPlayerInCameraView(){
Vector2 playerPosScreen = Camera.main.WorldToScreenPoint(transform.position);
if (playerPosScreen.x + screenEdgeHorizontal > Screen.width && (playerPosScreen.y - screenEdgeVertical < 0)){//右下
transform.position = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width-screenEdgeHorizontal, screenEdgeVertical, transform.position.z - Camera.main.transform.position.z));
} else if(playerPosScreen.x + screenEdgeHorizontal > Screen.width){//右
transform.position = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width-screenEdgeHorizontal, playerPosScreen.y, transform.position.z - Camera.main.transform.position.z));
} else if(playerPosScreen.x - screenEdgeHorizontal < 0f && (playerPosScreen.y - screenEdgeVertical < 0)){//左下
transform.position = Camera.main.ScreenToWorldPoint( new Vector3(screenEdgeHorizontal, screenEdgeVertical, transform.position.z - Camera.main.transform.position.z));
} else if(playerPosScreen.x - screenEdgeHorizontal < 0f){//左
transform.position = Camera.main.ScreenToWorldPoint( new Vector3(screenEdgeHorizontal, playerPosScreen.y, transform.position.z - Camera.main.transform.position.z));
} else if(playerPosScreen.y - screenEdgeVertical < 0){//下
transform.position = Camera.main.ScreenToWorldPoint(new Vector3(playerPosScreen.x, screenEdgeVertical, transform.position.z - Camera.main.transform.position.z));
}
}
