Designing Games with Game Maker - YoYo Games

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Attractors Besides emitters a particle system can also contain attractors. An attractor attracts the particles (or pushes them away). A particle system can have multiple attractors. You are though recommended to use few of these because they will slow down the processing of the particles. An attractor has the following properties: • x,y indicate the position of the attractor. • force indicates the attracting force of the attractor. How the force acts on the particles depends on the following parameters. • dist indicates the maximal distance at which the attractor has effect. Only particles closer that this distance to the attractor will be attracted. • kind indicates the kind of attractor. The following values exist o ps_force_constant indicates that the force is constant independent of the distance. o ps_force_linear indicates a linearly growing force. At the maximal distance the force is 0 while at the position of the attractor it attains the given value. o ps_force_quadratic indicates that the force grows quadratic. • additive indicates whether the force is added to the speed and direction in each step (true) or only applied to the position of the particle (false). When additive the particle will accelerate towards the attractor while <strong>with</strong> a non-additive force it will move there <strong>with</strong> constant speed. The following functions exist to define attractors. Note that each of them gets the index of the particle system to which it belongs as a first argument. part_attractor_create(ps) Creates a new attractor in the given particle system. It returns the index of the attractor. This index must be used in all calls below to set the properties of the attractor. part_attractor_destroy(ps,ind) Destroys attractor ind in the particle system. Call this if you don't need it anymore to save space. part_attractor_destroy_all(ps) Destroys all attractors in the particle system that have been created. part_attractor_exists(ps,ind) Returns whether the indicated attractor exists in the particle system. part_attractor_clear(ps,ind) Clears the attractor ind to its default
settings. part_attractor_position(ps,ind,x,y) Sets the position of attractor ind to (x,y). part_attractor_force(ps,ind,force,dist,kind,aditive) Sets the force parameters of attractor ind. Destroyers Destroyers destroy particles when they appear in their region. A particle system can have an arbitrary number of destroyers. A destroyer has the following properties: • xmin, xmax, ymin, ymax indicates the extent of the region in which the particles are destroyed. • shape indicates the shape of the region. It can have the following values: o ps_shape_rectangle o ps_shape_ellipse o ps_shape_diamond The following functions are available to set the properties of the destroyers. Note that each of them gets the index of the particle system to which it belongs as a first argument. part_destroyer_create(ps) Creates a new destroyer in the given particle system. It returns the index of the destroyer. This index must be used in all calls below to set the properties of the destroyer. part_destroyer_destroy(ps,ind) Destroys destroyer ind in the particle system. Call this if you don't need it anymore to save space. part_destroyer_destroy_all(ps) Destroys all destroyers in the particle system that have been created. part_destroyer_exists(ps,ind) Returns whether the indicated destroyer exists in the particle system. part_destroyer_clear(ps,ind) Clears the destroyer ind to its default settings. part_destroyer_region(ps,ind,xmin,xmax,ymin,ymax,shape) Sets the region for the destroyer. Deflectors
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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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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 213 and 214: does not matter. background_create_
Page 215 and 216: Scripts an empty path. path_reverse
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Page 229 and 230: Lists ds_queue_size(id) Returns the
Page 231 and 232: ds_map_create() Creates a new map.
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Page 235 and 236: ds_grid_get_mean(id,x1,y1,x2,y2) Re
Page 237 and 238: • ef_smokeup • ef_star • ef_s
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Page 241 and 242: Besides the color you can also give
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Page 253 and 254: mplay_connect_status() returns the
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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
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
Page 275 and 276: pr_trianglefan. d3d_model_vertex(in
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Designing Games with Game Maker - YoYo Games

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