Designing Games with Game Maker - YoYo Games

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date_date_of(date) Returns the date part of the indicated date-time value, setting the time part to 0. date_time_of(date) Returns the time part of the indicated date-time value, setting the date part to 0. date_datetime_string(date) Returns a string indicating the given date and time in the default format for the system. date_date_string(date) Returns a string indicating the given date in the default format for the system. date_time_string(date) Returns a string indicating the given time in the default format for the system. date_days_in_month(date) Returns the number of days in the month indicated by the date-time value. date_days_in_year(date) Returns the number of days in the year indicated by the date-time value. date_leap_year(date) Returns whether the year indicated by the date- time value is a leap year. date_is_today(date) Returns whether the indicated date-time value is on today. Game play There are a large number of variables and functions that you can use to define the game play. These in particular influence the movement and creation of instances, the timing, the room, and the handling of events. Information on game play can be found in the following pages: Moving Around Paths Motion Planning Collision Detection Instances Deactivating Instances Timing Rooms Score
Generating Events Miscellaneous Variables and Functions Moving around Obviously, an important aspect of games is the moving around of object instances. Each instance has two built-in variables x and y that indicate the position of the instance. (To be precise, they indicate the place where the origin of the sprite is placed. Position (0,0) is the top-left corner of the room. You can change the position of the instance by changing its x and y variables. If you want the object to make complicated motions this is the way to go. You typically put this code in the step event for the object. If the object moves with constant speed and direction, there is an easier way to do this. Each object instance has a horizontal speed (hspeed) and a vertical speed (vspeed). Both are indicated in pixels per step. A positive horizontal speed means a motion to the right, a negative horizontal speed mean a motion to the left. Positive vertical speed is downwards and negative vertical speed is upwards. So you have to set these variables only once (for example in the creating event) to give the object instance a constant motion. There is quite a different way for specifying motion, using a direction (in degrees 0-359), and a speed (should be non-negative). You can set and read these variables to specify an arbitrary motion. (Internally this is changed into values for hspeed and vspeed.) Also there is the friction and the gravity and gravity direction. Finally, there is the function motion_add(dir,speed) to add a motion to the current one. To be complete, each instance has the following variables and functions dealing with its position and motion: x Its x-position. y Its y-position. xprevious Its previous x-position. yprevious Its previous y-position. xstart Its starting x-position in the room. ystart Its starting y-position in the room. hspeed Horizontal component of the speed. vspeed Vertical component of the speed. direction Its current direction (0-360, counter-clockwise, 0 = to the right).
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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
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 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: date_get_hour(date) Returns the hou
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
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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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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