hpl2:amnesia:script_language_reference_and_guide:constants_and_enumerations
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hpl2:amnesia:script_language_reference_and_guide:constants_and_enumerations [2013/01/15 04:42] thegreatcthulhu [Enumerations] |
hpl2:amnesia:script_language_reference_and_guide:constants_and_enumerations [2015/10/06 21:06] (current) thegreatcthulhu [At a Glance] |
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| **Constants** | **Constants** | ||
| - | <code c++> | + | <code c++>// Some math constants: |
| - | // Some math constants: | + | |
| const float PI = 3.1415926f; | const float PI = 3.1415926f; | ||
| const float E = 2.7182818f; | const float E = 2.7182818f; | ||
| - | + | // Integer constants: | |
| - | // Integer constants: | + | |
| // The constants in this example define when should collision events take place; | // The constants in this example define when should collision events take place; | ||
| // intended to be used with the AddEntityCollideCallback() engine function | // intended to be used with the AddEntityCollideCallback() engine function | ||
| Line 28: | Line 26: | ||
| **Enumerated Constants (Enumerations)** | **Enumerated Constants (Enumerations)** | ||
| - | <code c++> | + | <code c++>enum Color // Note: Enums are based on the int type. |
| - | enum Color // Note: Enums are based on the int type. | + | |
| { | { | ||
| Red, // has the default value of: 0 | Red, // has the default value of: 0 | ||
| Line 35: | Line 32: | ||
| Blue // value: (previous + 1) = 2, etc, if more added... | Blue // value: (previous + 1) = 2, etc, if more added... | ||
| } | } | ||
| - | |||
| // Usage: | // Usage: | ||
| Line 44: | Line 40: | ||
| // Assigning an integer value is not possible without an explicit conversion: | // Assigning an integer value is not possible without an explicit conversion: | ||
| - | Color col = 2; // Causes compilation error! | + | Color col = 2; // Causes compilation error! |
| - | // Converting from integers - should generally be avoided: | + | // Converting from integers - should generally be avoided: |
| Color col = Color(2); // Assigns Blue to col, since 2 corresponds to Color::Blue | Color col = Color(2); // Assigns Blue to col, since 2 corresponds to Color::Blue | ||
| Line 54: | Line 50: | ||
| // This is allowed: | // This is allowed: | ||
| int colValue = col; // so, enums can be passed to functions expecting ints --> see example below | int colValue = col; // so, enums can be passed to functions expecting ints --> see example below | ||
| - | |||
| - | |||
| // Enumerations - choosing your own values | // Enumerations - choosing your own values | ||
| Line 68: | Line 62: | ||
| AddEntityCollideCallback("Player", "Area_Example", "ExampleCallback", false, CollisionState::Both); | AddEntityCollideCallback("Player", "Area_Example", "ExampleCallback", false, CollisionState::Both); | ||
| - | + | // You can define all or some of the values; those left undefined will be | |
| - | // You can define all or some of the values; those left undefined will be | + | |
| // assigned the value of previous_constant + 1 | // assigned the value of previous_constant + 1 | ||
| enum Ending | enum Ending | ||
| - | { | + | { |
| Good = 1, // = 1 | Good = 1, // = 1 | ||
| ReallyGood, // = 2 (previous + 1) | ReallyGood, // = 2 (previous + 1) | ||
hpl2/amnesia/script_language_reference_and_guide/constants_and_enumerations.txt · Last modified: 2015/10/06 21:06 by thegreatcthulhu
