Designing Games with Game Maker - YoYo Games

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mplay_session_find() searches for all sessions that still accept players and returns the number of sessions found. mplay_session_name(numb) returns the name of session number numb (0 is the first session). This routine can only be called after calling the previous routine. mplay_session_join(numb,playername) makes you join session number numb (0 is the first session). playername is your name as a player. Returns whether successful. There is one more routine that can change the session mode. It should be called before creating a session: mplay_session_mode(move) sets whether or not to move the session host to another computer when the host ends. move should either be true or false (the default). To check the status of the current session you can use the following function mplay_session_status() returns the status of the current session. 0 = no session, 1 = created session, 2 = joined session. A player can stop a session using the following routine: Players mplay_session_end() ends the session for this player. Each instance of the game that joins a session is a player. As indicated above, players have names. There are three routines that deal with players. mplay_player_find() searches for all players in the current session and returns the number of players found. mplay_player_name(numb) returns the name of player number numb (0 is the first player, which is always yourself). This routine can only be called after calling the previous routine. mplay_player_id(numb) returns the unique id of player number numb (0 is the first player, which is always yourself). This routine can only be called after
calling the first routine. This id is used in sending and receiving messages to and from individual players. Shared data Shared data communication is probably the easiest way to synchronize the game. All communication is shielded from you. There is a set of 1000000 values that are common to all entities of the game (preferably only use the first few to save memory). Each entity can set values and read values. Game Maker makes sure that each entity sees the same values. A value can either be a real or a string. There are just two routines: mplay_data_write(ind,val) write value val (string or real) into location ind (ind between 0 and 1000000). mplay_data_read(ind) returns the value in location ind (ind between 0 and 1000000). Initially all values are 0. To synchronize the data on the different machines you can either use a guaranteed mode that makes sure that the change arrives on the other machine (but which is slow) or non- guaranteed. To change this use the following routine: mplay_data_mode(guar) sets whether or not to use guaranteed transmission for shared data. guar should either be true (the default) or false. Messages The second communication mechanism that Game Maker supports is the sending and receiving of messages. A player can send messages to one or all other players. Players can see whether messages have arrived and take action accordingly. Messages can be sent in a guaranteed mode in which you are sure they arrive (but this can be slow) or in a non- guaranteed mode, which is faster. The following messaging routines exist: mplay_message_send(player,id,val) sends a message to the indicated player (either an identifier or a name; use 0 to send the message to all players). id is an integer message identifier and val is the value (either a real or a string). The message is sent in non-guaranteed mode. If val contains a
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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
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to right. You specify the rectangle
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You can change most of these variab
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To add instances to the room, first
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At the top you will see the backgro
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When you start Game Maker in advanc
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• Show the origin and bounding bo
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Editing your sprites Up to now we l
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• Scale. This command scales the
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• Disappear. Makes the image disa
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Once you selected the correct set o
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• Clear. Clear the image to the l
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Multiple normal sounds can play at
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You can indicate a number of settin
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When a ball hits the floor it must
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action it lets the instance take a
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The following additional draw actio
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dies. The transparency slowly chang
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Resume CD Resumes a paused CD. Chec
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e the way you left it the last time
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At the left top there is the curren
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At the top there is a box labeled E
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Letters range that contains all upp
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top tool bar. Here you can also ind
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You might wonder what happens when
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Set the time line position With thi
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As you might have noticed, parts of
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In this form you can indicate which
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about the game and how it was creat
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Resolution In this tab you can set
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Also you can set the priority of th
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Change to change a selected file, D
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Here you can set a number of option
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Game Maker contains a built-in prog
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• !: not, turns true into false a
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} instance_create(xx,yy,ball); Addr
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} obj[1].id.x = 12; The last statem
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{ } repeat (5) instance_create(rand
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} for (i=0; i
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A function has the form of a functi
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with (ball) { } x = random(room_wid
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andom_set_seed(seed) Sets the seed
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string_copy(str,index,count) Return
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date_get_hour(date) Returns the hou
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Generating Events Miscellaneous Var
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Paths move_bounce_all(adv) Bounces
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e careful how and when you apply it
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overwritten by the new path. (See a
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mp_grid_add_instances(id,obj,prec)
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instance_count* Number of instances
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When you deactivate instances they
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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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Page 205 and 206: sound_discard(index) Frees the audi
Page 207 and 208: script_exists(ind) Returns whether
Page 209 and 210: • Make sure you delete resources
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Page 231 and 232: ds_map_create() Creates a new map.
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Page 237 and 238: • ef_smokeup • ef_star • ef_s
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Page 247 and 248: settings. part_attractor_position(p
Page 249 and 250: Changers change certain particles w
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Page 263 and 264: Note that at the moment a new insta
Page 265 and 266: } ttt = background_get_texture(back
Page 267 and 268: Default you look along the negative
Page 269 and 270: A standard use for this is to draw
Page 271 and 272: { } d3d_transform_set_identity(); d
Page 273 and 274: d3d_light_define_direction(ind,dx,d
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Designing Games with Game Maker - YoYo Games

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