Designing Games with Game Maker - YoYo Games

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speed Its current speed (pixels per step). friction Current friction (pixels per step). gravity Current amount of gravity (pixels per step). gravity_direction Direction of gravity (270 is downwards). motion_set(dir,speed) Sets the motion with the given speed in direction dir. motion_add(dir,speed) Adds the motion to the current motion (as a vector addition). There are a large number of functions available that help you in defining your motions: place_free(x,y) Returns whether the instance placed at position(x,y) is collision-free. This is typically used as a check before actually moving to the new position. place_empty(x,y) Returns whether the instance placed at position (x,y) meets nobody. So this function takes also non-solid instances into account. place_meeting(x,y,obj) Returns whether the instance placed at position (x,y) meets obj. obj can be an object in which case the function returns true is some instance of that object is met. It can also be an instance id, the special word all meaning an instance of any object, or the special word other. place_snapped(hsnap,vsnap) Returns whether the instance is aligned with the snapping values. move_random(hsnap,vsnap) Moves the instance to a free random, snapped position, like the corresponding action. move_snap(hsnap,vsnap) Snaps the instance, like the corresponding action. move_wrap(hor,vert,margin) Wraps the instance when it has left the room to the other side. hor indicates whether to wrap horizontaly and vert indicates whether to wrap vertically. margin indicates how far the origin of the instance must be outside the room before the wrap happens. So it is a margin around the room. You typically use this function in the Outside event. move_towards_point(x,y,sp) Moves the instances with speed sp toward position (x,y). move_bounce_solid(adv) Bounces against solid instances, like the corresponding action. adv indicates whether to use advance bounce, that also takes slanted walls into account.
Paths move_bounce_all(adv) Bounces against all instances, instead of just the solid ones. move_contact_solid(dir,maxdist) Moves the instance in the direction until a contact position with a solid object is reached. If there is no collision at the current position, the instance is placed just before a collision occurs. If there already is a collision the instance is not moved. You can specify the maximal distance to move (use a negative number for an arbitrary distance). move_contact_all(dir,maxdist) Same as the previous function but this time you stop at a contact with any object, not just solid objects. move_outside_solid(dir,maxdist) Moves the instance in the direction until it no longer lies within a solid object. If there is no collision at the current position the instance is not moved. You can specify the maximal distance to move (use a negative number for an arbitrary distance). move_outside_all(dir,maxdist) Same as the previous function but this time you move until outside any object, not just solid objects. distance_to_point(x,y) Returns the distance of the bounding box of the current instance to (x,y). distance_to_object(obj) Returns the distance of the instance to the nearest instance of object obj. position_empty(x,y) Returns whether there is nothing at position (x,y). position_meeting(x,y,obj) Returns whether at position (x,y) there is an instance obj. obj can be an object, an instance id, or the keywords self, other, or all. In Game Maker you can define paths and order instances to follow such paths. Although you can use actions for this, there are functions and variables that give you more flexibility: path_start(path,speed,endaction,absolute) Starts a path for the current instance. The path is the name of the path you want to start. The speed is the speed with which the path must be followed. A negative speed means that the instance moves backwards along the path. The endaction indicates what should happen when the end of the path is reached. The following values can be used:
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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
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 and 96: As you might have noticed, parts of
Page 97 and 98: In this form you can indicate which
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: Generating Events Miscellaneous Var
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
Page 147 and 148: loading. You can also save and load
Page 149 and 150: score The current score. lives Numb
Page 151 and 152: ev_joystick1_button7 ev_joystick1_b
Page 153 and 154: Here are some variables and functio
Page 155 and 156: There is no game without interactio
Page 157 and 158: vk_insert insert key vk_pageup page
Page 159 and 160: You can change the way the mouse cu
Page 161 and 162: image_index When the image has mult
Page 163 and 164: 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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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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