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Introduction to Variables and Control Structures in Game Maker Language (GML)

This tutorial covers the fundamental concepts of variables and control structures in Game Maker Language (GML). Learn about creating and managing variables, including relative and global variables, and how to utilize IF and IF ELSE statements to implement decision-making in your games. Understand the importance of variables for tracking game states and creating engaging gameplay. With step-by-step instructions, you will create a variable to manage a player's key count, and learn how to decrement and respond to conditions using different control structures.

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Introduction to Variables and Control Structures in Game Maker Language (GML)

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Presentation Transcript

  1. Game Maker Tutorials 1 Variables and Simple Controls

  2. Content • GML (game maker language) • Variables • Relative and Not Relative • IF statements • IF ELSE statements

  3. Variable • What is it? • Location in memory with a variable _______ • Programs use it to _______ information • Why do we need it? • To keep track of things • ________________ • _____________

  4. How to create variable in GM? • In the _________ tab • The square symbol ______ • Click and the screen appears

  5. Creating a variable • Lets create a variable to hold the amount of keys we have • We need to give it a name, But lets make it global E.g. global.keys We set the value to say… 6 • Now we have create a location in memory named “keys” and stored 6 in it. • _______________________ • _____ just means it is accessible by all objects in the game.

  6. How do we increment instead? • We tick the Relative box With “Relative” meansadd 6 to the original This is an ______ This is an _________ _______________ ______________________

  7. If Statement • Used to make decisions • e.g. Lets look at some code global.keys = 6 //increment or set? If global.keys > 0 //variable check { global.keys = global.keys – 1 //decrement } To do a if statement you use _________ symbols Since we want to check a variable we use

  8. How to do in GM? If global.keys > 0 { global.keys = global.keys – 1 }

  9. Setting up your IF statement If global.keys > 0 = equals > < >= <= less than and equal

  10. IF statement global.keys = 0 ; //_______________ If global.keys > 0 //______________ { global.keys = global.keys – 1 ; //____________ } • What will happen now?

  11. IF Else Statement global.keys= 0 //set to zero if global.keys > 0 //variable check { global.keys = global.keys – 1; //decrement } else { draw_text(x,y, “you got no keys); } • ___________________________________

  12. Having MORE Else Test element: global.keys if global.keys < 0 // below but not equal to { draw_text(x,y, 'no keys'); } else if global.keys =1 //checks a single number { draw_text(x,y, 'happy'); } else if global.keys >= 3 and global.keys < 6 //handles a range { draw_text(x,y, 'coolness'); } else if global.keys >= 7 //greater and equal to { draw_text(x,y, 'awesomeness'); } else { draw_text(x,y, 'joy'); }

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