官术网_书友最值得收藏!

Making decisions based on user input

Decisions always have to be made when the user provides input. The input can arrive from different types of interfaces depending on the platform that we are working on. For example, if we are developing games for mobile phones, we would use the touch screen as an input for swipe, touch, touch with two fingers, and so on, while for game consoles we would use the gamepad buttons. For each button, we can assign an action and it's possible to combine multiple buttons (inputs) to perform different actions. Another important aspect that we need to consider is that when we press a key or a button, three different inputs are happening at that instance, GetKey, GetKeyDown, and GetKeyUp:

As we can see in the preceding description, we can assign three different actions for the same key, so we are not limited to only one option. Previously in this chapter, we used an example where the user had to press the Enter key to call the AddTwoNumbers() method:

if(Input.GetKeyUp(Keycode.Return)) AddTwoNumbers(); 

The if statement's condition becomes true only when the Return key is released after being pressed down.

Notice that the code of AddTwoNumbers() isn't between two curly brackets. When there is only one line of code to execute for an if or else statement, you have the option of not using the curly brackets.

Here's a partial screenshot of the GetKeyUp() method, as shown in Unity's Scripting Reference:

主站蜘蛛池模板: 始兴县| 马山县| 九台市| 麻江县| 龙川县| 广昌县| 杂多县| 富平县| 石嘴山市| 彰武县| 贵德县| 金湖县| 闽侯县| 湘西| 福州市| 类乌齐县| 鄂伦春自治旗| 南皮县| 大方县| 黔西| 灵宝市| 凯里市| 新泰市| 宁安市| 孝义市| 错那县| 工布江达县| 太康县| 广德县| 南丹县| 泗阳县| 东乡县| 岑溪市| 呼伦贝尔市| 都江堰市| 南陵县| 临西县| 额济纳旗| 南投市| 黄平县| 渝中区|