Intro to gml

Intro to GMLGame Maker Language

GMLInterpreted programming language that you can use to substantially enhance the games you create using Game MakerSupplementExtendReplace ActionsInterpreted Programming LanguageScripts are interpreted and compiled just before they are executed

Game Maker Scripts MenuImport ScriptsExport ScriptsShow Built-In Variables – Global/local variablesShow Built-In Functions – Game Maker’s functionsShow Extension functions – through extension pkgsShow Constants Show Resource Names – resources defined in your appSearch in Scripts – matching stringsCheck Resource Names – look for resource name conflictsCheck All Scripts – syntax check

Game Maker Scripts EditorAccessed through the Script Properties WindowCreate scripts by typing the windowAuto color-codedAssists in writing codeSmart tabs automatically indent statements

SyntaxScripts are made up of one ore more GML code statements embedded within an opening bracket and closing bracket { }All code statements should end with a semi-colon ;

Adding a script{//set the drawing colordraw_set_color(c_black);//draw a filled rectangledraw_rectangle(50,50,590,430,false);//set the drawing colordraw_set_color(c_yellow);//draw textdraw_text(210,200,"Hello World");}Then assign an object to execute a scriptMay also be created as code if only used once

Executing GML Code to RoomsCan execute code when rooms are createdOpen a room and click on its settings tabButton at the bottom of the tab labeled Creation CodeCode for the room will be executed once (and only once) when the room is created

GML ScriptingData typesInteger – any whole number positive or negative, as well as 0Real – Numbers that include decimal pointsString – Set of characters embedded within single or double quotations

VariablesVariable – pointer to a location in memory where data is storedVariable names must begin with a letterLetters, numbers, underscoresNo blanksNo game maker language key words or names of defined resourcesTo assign a value to a variable, use the “=“Name = “Tracy”;

Special VariablesX – coordinate for a given objecty – “ “DirectionSpeedHspeedVspeedSolidSprite_heightSprite_width

ConstantsA constant is a value whose value is known at design time and does not change during the execution of the gameColors, for example (c_black, c_blue, c_green)Click on “show constants” on the scripts menuConstants cannot be “accidentally” changed, are self-documenting, and typically require less memory

ArraysAn array is an indexed list of data that is stored and managed as a collection, preserving the value of the variable and its relationship with other variablesOne dimensional and two dimensionalArrayname[indices]Ex: {names[0]=“Captain Jack”;names[1]=“Mad Hatter”;names[2]=“Willy Wonka”;}

Setting up a LoopSet up a loopFor(i=0; I<3; i=i+1) {draw_text(x,y,names[i]); y = y+20}Executes the script three timesCan be used to list each item in an array

The IF statementThe if statement is used to evaluate an expression and then initate an action if that expression evaluates as true.If (expression){ statements;}Example (if statement as part of a guessing game:if(secretnumber=real(userGuess)) show_message(“You Guessed It”);If statements can be nested

Intro to gml

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