文法從0開始 vs FlightPlan!

◎ 「基礎的英文文法書」 對於初學者而言，文法書內容不應該著重在每一個詞性的解說，以免導致初學者對文法產生混亂複雜的感覺而糢糊不清，接著就失去信心。

所以本文法書以「初學者的思考方式」及「使用比較生活化的口語的方式」來寫這本書，藉由調整傳統英文文法章節的順序及介紹內容，為的是可以先讓初學者可以寫出一個簡單結構的句子，再慢慢把句子複雜化，最後可以讓初學者寫出一個結構比較複雜的句子。 【本書特色】 ● 可輕鬆的學習 ● 用字精準清楚 ● 內容重點標示 ● 默默學會文法 ◎ 學習英文文法就跟學習所有的事物一樣，你必須先學會簡單的基礎，進而慢慢地開始學做比較進階的部分，因為有了基礎後，再進一步學習就會比較容易上手，也比較有信心。當然，你可以跳過基礎直接從進階開始，然而你會發現其實很多觀念都是不清楚的，事物稍微變化你可能就會無所適從。學習英文文法也是一樣的，你必須先學會一個句子最基礎的結構，等結構清楚了，就可以讓你有信心學習更進階的文法了。 
 【本書目的】 ◎ 可以讓一個幾乎沒有文法基礎的人很輕鬆且清楚地了解文法的架構，而了解文法架構之後，你就會開始覺得以前看起來很複雜的句子事實上是很簡單的，之後再遇到相關或比較艱難的文法問題時，可以容易理解及掌握，讓學習如虎添翼，為初學者開啟文法學習之路。 【適合人群】

 ● 喜歡輕鬆學習的人 
● 初學英文的人 
● 句子結構不了解的人

This app allows you to visually program a flight plan for the Tello Drone and then upload it to the drone for execution. You can also fly the drone manually with the app if you wish. Real time telemetry from the drone is displayed on the glass cockpit. Tello is a mini drone equipped with a HD camera that is manufactured by Ryze Robotics and includes a flight controller with DJI smarts. We access the Tello API by connecting to the airframe via a WiFi UDP port. Once a connection is in place, the drone is controlled using simple text commands. So before using the app, make sure that your Tello drone is on and the iPhone is connected to the Tello WiFi. You can check this by going to Settings -> WiFi. The first time that you use the app it will request your permission to use Location Services. This is required to allow the app to determine the SSID of the WiFi connection so we know when you are connected to the drone. The app doesn't use location services for anything else. The app has two modes of operation: manual and planning / auto pilot. The app status is shown in the top centre panel. This panel also indicates whether WiFi is connected or not. It may take a few seconds for a change in WiFi status to be displayed.  If you are connected to the Tello and in manual mode, then tapping the take off icon will cause the drone to auto take off and hover. Tapping land will auto land. Only tap emergency stop if necessary as it will immediately stop all four motors and the drone will fall out of the sky! Tapping the plan button toggles the app state between planning mode and manual mode. In planning mode a grid (representing the ground) and yellow arrow (representing the drone), will appear. The arrow direction indicates the front of the drone. In planning mode, you can enter the sequence of commands which will be transmitted to your drone for execution. Start with take off or you will receive a warning message. When you are finished with your flight plan tap land. The arrow will simulate the position of the drone but is not to scale. Tapping the upload icon will send your flight plan to the Tello and execute it. While the plan is being flown, the app will display the glass cockpit. Real time telemetry from the drone is displayed on the glass cockpit. This includes pitch, roll, yaw, velocity (x, y, z), temperature, time of flight (tof), height, battery percentage, motor on time, barometric pressure, and acceleration (x, y, z). A full description of how the app operates is provided at our website (reefwing.com.au). FlightPlan is a refined version of another that I described in an article called "Programming the Tello Drone using Swift." (https://medium.com/@reefwing/programming-the-tello-drone-using-swift-f9122fd4aeb8?). You can refer to this article to understand how the app operates and create your own version.