Designing Games with Game Maker - YoYo Games

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Under the Run menu you can pause the game, run it step by step and even restart it. Under the Watch menu you can watch the value of certain expressions. Use Add to type in some expression whose value is shown in each step of the game. In this way you can see whether your game is doing things the right way. You can watch many expressions. You can save them for later use (e.g. after you made a correction to the game). Under the Tools menu you find items to see even more information. You can see a list of all instances in the game, you can watch all global variables (well, the most important ones) and the local variables of an instance (either use the object name or the id of the instance). You can also view messages which you can send from your code using the function show_debug_message(str). Finally you can give the game commands and change the speed of the game. If you make complicated games you should really learn how to use the debug options. Extension Packages This functionality is only available in the Pro Edition of Game Maker. Extension packages extend the possibilities of Game Maker. An extension package can add a set of actions to Game Maker or it adds a number of additional functions and constants to the GML language built into Game Maker. When extension packages are available to you, help about these is placed in the Help menu. When double clicking on the Extension Packages resource item the following form is shown:
In this form you can indicate which extension packages must be used in the game. On the left there is the list of Used packages and on the right is the list of Available packages. To move a package from one list to the other, simply select it and press the button between the list. When selecting a package a short description is given at the bottom. Further help is available by pressing the Help button. Extension packages are an extremely powerful part of Game Maker. A few extension packages are provided with Game Maker but many more will become available through the website. To install new packages or uninstall existing ones, press the Install button. The following form is shown
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What is New Designing Games with Ga
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It can now be indicated whether or
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• You can now set the variable cu
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Playing computer games is fun. But
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Upgrading to the Pro Edition Game M
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http://www.yoyogames.com/upgrade He
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simple: There is a blue ball bounci
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(Actually, this is what you see whe
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Resources menu In this menu, you ca
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When you make a game you normally s
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To create a background resource in
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whether this is a solid object (lik
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Here you select the event you want
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the keys pressed happen. Note that
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Key release events This event is si
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Relative. If you check this, the ne
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object is reached. If there already
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Transform Sprite Use this action to
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Sleep With this action you can free
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Check Collision This is the reverse
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peferably only for small pieces of
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provide the positions and the capti
Page 45 and 46: to right. You specify the rectangle
Page 47 and 48: You can change most of these variab
Page 49 and 50: To add instances to the room, first
Page 51 and 52: At the top you will see the backgro
Page 53 and 54: When you start Game Maker in advanc
Page 55 and 56: • Show the origin and bounding bo
Page 57 and 58: Editing your sprites Up to now we l
Page 59 and 60: • Scale. This command scales the
Page 61 and 62: • Disappear. Makes the image disa
Page 63 and 64: Once you selected the correct set o
Page 65 and 66: • Clear. Clear the image to the l
Page 67 and 68: Multiple normal sounds can play at
Page 69 and 70: You can indicate a number of settin
Page 71 and 72: When a ball hits the floor it must
Page 73 and 74: action it lets the instance take a
Page 75 and 76: The following additional draw actio
Page 77 and 78: dies. The transparency slowly chang
Page 79 and 80: Resume CD Resumes a paused CD. Chec
Page 81 and 82: e the way you left it the last time
Page 83 and 84: At the left top there is the curren
Page 85 and 86: At the top there is a box labeled E
Page 87 and 88: Letters range that contains all upp
Page 89 and 90: top tool bar. Here you can also ind
Page 91 and 92: You might wonder what happens when
Page 93 and 94: Set the time line position With thi
Page 95: As you might have noticed, parts of
Page 99 and 100: about the game and how it was creat
Page 101 and 102: Resolution In this tab you can set
Page 103 and 104: Also you can set the priority of th
Page 105 and 106: Change to change a selected file, D
Page 107 and 108: Here you can set a number of option
Page 109 and 110: Game Maker contains a built-in prog
Page 111 and 112: • !: not, turns true into false a
Page 113 and 114: } instance_create(xx,yy,ball); Addr
Page 115 and 116: } obj[1].id.x = 12; The last statem
Page 117 and 118: { } repeat (5) instance_create(rand
Page 119 and 120: } for (i=0; i
Page 121 and 122: A function has the form of a functi
Page 123 and 124: with (ball) { } x = random(room_wid
Page 125 and 126: andom_set_seed(seed) Sets the seed
Page 127 and 128: string_copy(str,index,count) Return
Page 129 and 130: date_get_hour(date) Returns the hou
Page 131 and 132: Generating Events Miscellaneous Var
Page 133 and 134: Paths move_bounce_all(adv) Bounces
Page 135 and 136: e careful how and when you apply it
Page 137 and 138: overwritten by the new path. (See a
Page 139 and 140: mp_grid_add_instances(id,obj,prec)
Page 141 and 142: instance_count* Number of instances
Page 143 and 144: When you deactivate instances they
Page 145 and 146: As you should know, every instance
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loading. You can also save and load
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score The current score. lives Numb
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ev_joystick1_button7 ev_joystick1_b
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Here are some variables and functio
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There is no game without interactio
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vk_insert insert key vk_pageup page
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You can change the way the mouse cu
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image_index When the image has mult
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ackground_height[0...7]* Height of
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,xscale,yscale,rot,c1,c2,c3,c4,alph
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ection,showback,showborder) With th
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Fonts and text In games you sometim
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This functionality is only availabl
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sprite_get_texture(spr,subimg) Retu
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draw_set_blend_mode(mode) Indicates
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position (x,y) in the surface. This
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change their position, and even sca
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indicated depth to the new depth. W
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window_set_sizeable(sizeable) Sets
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window_default() Gives the window t
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can also assign an instance id to t
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Be careful when using this techniqu
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sound_volume(index,value) Changes t
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wave Waveform of the LFO. (0 = tria
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accordingly. The effect is especial
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MCI_command(str) This functions sen
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e adapted to the scaled size of the
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message_caption(show,str) Sets the
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place (1-10). This can be used to d
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sound_discard(index) Frees the audi
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script_exists(ind) Returns whether
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• Make sure you delete resources
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sprite_add_from_surface(ind,id,x,y,
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does not matter. background_create_
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Scripts an empty path. path_reverse
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ehavior we must define events for t
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oom. room_tile_add(ind,back,left,to
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fa_directory directories fa_archive
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using the file selector. Note that
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To pass certain parameter settings
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All data structures work globally i
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Lists ds_queue_size(id) Returns the
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ds_map_create() Creates a new map.
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Grids an easy mechanism for saving
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ds_grid_get_mean(id,x1,y1,x2,y2) Re
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• ef_smokeup • ef_star • ef_s
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at the beginning of the animation o
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Besides the color you can also give
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front of, or between object instanc
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• distribution indicates the dist
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settings. part_attractor_position(p
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Changers change certain particles w
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part_type_gravity(pt2,0.2,270); par
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mplay_connect_status() returns the
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calling the first routine. This id
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This functionality is only availabl
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ty_real,2,ty_real,ty_real); global.
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• When you use the 3D functionali
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Note that at the moment a new insta
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} ttt = background_get_texture(back
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Default you look along the negative
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A standard use for this is to draw
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{ } d3d_transform_set_identity(); d
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d3d_light_define_direction(ind,dx,d
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pr_trianglefan. d3d_model_vertex(in
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Designing Games with Game Maker - YoYo Games

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