Designing Games with Game Maker - YoYo Games

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Objects does not exist it is created. So you can add multiple code actions for the same moment. timeline_moment_clear(ind,step) You can use this function to clear all the actions for a particular moment. Also objects can be manipulated and created during the game play. NEVER change or delete an object for which there are instances. This can lead to unexpected effects as certain object properties are stored with the instance and, hence, changing them in the object will not have the desired effect. object_set_sprite(ind,spr) Sets the sprite of the object with the given index. Use -1 to remove the current sprite from the object. object_set_solid(ind,solid) Sets whether instances created of the object must default be solid (true or false). object_set_visible(ind,vis) Sets whether instances created of the object must default be visible (true or false). object_set_depth(ind,depth) Sets the default depth of instances created of the object. object_set_persistent(ind,pers) Sets whether instances created of the object must default be persistent (true or false). object_set_mask(ind,spr) Sets the sprite mask of the object with the given index. Use -1 to set the mask to be the sprite of the object. object_set_parent(ind,obj) Sets the parent of the object. Use -1 to not have a parent. Changing the parent changes the behavior of instances of the object. The following routines are useful for creating objects on the fly. As with all resource changing routines, be very careful that you don't create new objects all the time. object_add() Adds a new object. It returns the index of the object. You can now use this index in the routines above to set certain properties of the object and then you can use the index to create instances of the object. object_delete(ind) Deletes the object with the given index. Make sure no instances of the object exist in any of the rooms. object_event_add(ind,evtype,evnumb,codestr) To give the object a
ehavior we must define events for the object. You can only add code actions to events. You need to specify the object, the event type, the event number (use the constants that have been specified before for the event_perform() function). Finally you provide the code string that must be executed. You can add multiple code actions to each event. object_event_clear(ind,evtype,evnumb) You can use this function to clear all the actions for a particular event. Creating objects is in particular useful when you are designing scripts or action libraries. For example, an initialization script can create an object to display a text and another script can add such an object with a particular text. In this way you have a simple mechanism to display texts without the need to create objects using the standard interface. Rooms Manipulating rooms on the fly is a dangerous thing to do. You have to realize that rooms change all the time due to what is happening in the game. This normally only involves the currently active room and there are many routines described in previous sections to manipulate the instances, backgrounds, and tiles in the active room. But changes in the active room will last if the room is persistent. Hence, you should never manipulate aspects of the currently active room or any room that is persistent and that has already been visited before. Such changes in general won't be noticed but might sometimes even lead to unexpected errors. Due to the fact that rooms are linked in a complicated way there is also no routine to delete a room. The following routines are available room_set_width(ind,w) Sets the width for the room with the indicated index. room_set_height(ind,h) Sets the height for the room with the indicated index. room_set_caption(ind,str) Sets the caption for the room with the indicated index. room_set_persistent(ind,val) Sets whether the room with the indicated index is persistent or not. room_set_code(ind,str) Sets the initialization code string for the room
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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
Page 165 and 166: ,xscale,yscale,rot,c1,c2,c3,c4,alph
Page 167 and 168: ection,showback,showborder) With th
Page 169 and 170: Fonts and text In games you sometim
Page 171 and 172: This functionality is only availabl
Page 173 and 174: sprite_get_texture(spr,subimg) Retu
Page 175 and 176: draw_set_blend_mode(mode) Indicates
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Page 183 and 184: window_set_sizeable(sizeable) Sets
Page 185 and 186: window_default() Gives the window t
Page 187 and 188: can also assign an instance id to t
Page 189 and 190: Be careful when using this techniqu
Page 191 and 192: sound_volume(index,value) Changes t
Page 193 and 194: wave Waveform of the LFO. (0 = tria
Page 195 and 196: accordingly. The effect is especial
Page 197 and 198: MCI_command(str) This functions sen
Page 199 and 200: e adapted to the scaled size of the
Page 201 and 202: message_caption(show,str) Sets the
Page 203 and 204: place (1-10). This can be used to d
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
Page 211 and 212: sprite_add_from_surface(ind,id,x,y,
Page 213 and 214: does not matter. background_create_
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Page 223 and 224: using the file selector. Note that
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Page 227 and 228: All data structures work globally i
Page 229 and 230: Lists ds_queue_size(id) Returns the
Page 231 and 232: ds_map_create() Creates a new map.
Page 233 and 234: Grids an easy mechanism for saving
Page 235 and 236: ds_grid_get_mean(id,x1,y1,x2,y2) Re
Page 237 and 238: • ef_smokeup • ef_star • ef_s
Page 239 and 240: at the beginning of the animation o
Page 241 and 242: Besides the color you can also give
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Page 245 and 246: • distribution indicates the dist
Page 247 and 248: settings. part_attractor_position(p
Page 249 and 250: Changers change certain particles w
Page 251 and 252: part_type_gravity(pt2,0.2,270); par
Page 253 and 254: mplay_connect_status() returns the
Page 255 and 256: calling the first routine. This id
Page 257 and 258: This functionality is only availabl
Page 259 and 260: ty_real,2,ty_real,ty_real); global.
Page 261 and 262: • When you use the 3D functionali
Page 263 and 264: Note that at the moment a new insta
Page 265 and 266: } 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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