Designing Games with Game Maker - YoYo Games

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in different object property forms.) Use the right mouse button and select the correct menu item to remove actions (or use the key) and to copy and paste selected actions. When you drop an action in the action list, a window will pop-up most of the time, in which you can fill in certain parameters for the action. The parameters will be described below when describing the actions. Two types of parameters appear in many actions so we will describe these here. At the top you can indicate to which instance the action applies. The default is self, which is the instance for which the action is performed. Most of the time, this is what you want. In the case of a collision event, you can also specify to apply the action to the other instance involved in the collision. For instance, in this way you can destroy the other instance. Finally, you can choose to apply the action to all instances of a particular object. In this way you could change all red balls into blue balls. The second type of parameter is the box labeled Relative. By checking this box, the values you type in are relative to the current values. For example, in this way you can add something to the current score, rather than changing the current score to the new value. The other parameters will be described below. You can later change the parameters by double clicking on the action. Move actions The first set of actions consists of those related to movement of objects. The following actions exist: Move Fixed Use this action to start the instance moving in a particular direction. You can indicate the direction using the buttons with the arrows on it. Use the middle button to stop the motion. Also you need to specify the speed of the motion. This speed is given in pixels per step. The default value is 8. Preferably don't use negative speeds. You can specify multiple directions. In this case a random choice is made. In this way you can let a monster start moving either left or right. Move Free This is the second way to specify a motion. Here you can indicate a precise direction. This is an angle between 0 and 360 degrees. 0 means to the right. The direction is counter-clockwise. So for example 90 indicates an upward direction. If you want an arbitrary direction, you can type random(360). As you will see below the function random gives a random number smaller than the indicated value. As you might have noticed there is a checkbox labeled
Relative. If you check this, the new motion is added to the previous one. For example, if the instance is moving upwards and you add some motion to the left, the new motion will be upwards to the left. Move Towards This action gives a third way to specify a motion. You indicate a position and a speed and the instance starts moving with the speed towards the position. (It won't stop at the position!) For example, if you want a bullet to fly towards the position of the spaceship you can use as position spaceship.x, spaceship.y. (You will learn more about the use of variables like these below.) If you check the Relative box, you specify the position relative to the current position of the instance. (The speed is not taken relatively!) Speed Horizontal The speed of an instance consists of a horizontal part and a vertical part. With this action you can change the horizontal speed. A positive horizontal speed means a motion to the right. A negative one means a motion to the left. The vertical speed will remain the same. Use relative to increase the horizontal speed (or decrease it by providing a negative number). Speed Vertical In a similar way, with this action you can change the vertical speed of the instance. Set Gravity With this action you can create gravity for this particular object. You specify a direction (angle between 0 and 360 degrees) and a speed, and in each step this amount of speed in the given direction is added to the current motion of the object instance. Normally you need a very small speed increment (like 0.01). Typically you want a downward direction (270 degrees). If you check the Relative box you increase the gravity speed and direction. Note that, contrary to real life, different object can have different gravity directions. Reverse Horizontal With this action you reverse the horizontal motion of the instance. This can for example be used when the object collides with a vertical wall. Reverse Vertical With this action you reverse the vertical motion of the instance. This can for example be used when the object collides with a horizontal wall.
Page 1 and 2: What is New Designing Games with Ga
Page 3 and 4: It can now be indicated whether or
Page 5 and 6: • You can now set the variable cu
Page 7 and 8: Playing computer games is fun. But
Page 9 and 10: Upgrading to the Pro Edition Game M
Page 11 and 12: http://www.yoyogames.com/upgrade He
Page 13 and 14: simple: There is a blue ball bounci
Page 15 and 16: (Actually, this is what you see whe
Page 17 and 18: Resources menu In this menu, you ca
Page 19 and 20: When you make a game you normally s
Page 21 and 22: To create a background resource in
Page 23 and 24: whether this is a solid object (lik
Page 25 and 26: Here you select the event you want
Page 27 and 28: the keys pressed happen. Note that
Page 29: Key release events This event is si
Page 33 and 34: object is reached. If there already
Page 35 and 36: Transform Sprite Use this action to
Page 37 and 38: Sleep With this action you can free
Page 39 and 40: Check Collision This is the reverse
Page 41 and 42: peferably only for small pieces of
Page 43 and 44: provide the positions and the capti
Page 45 and 46: to right. You specify the rectangle
Page 47 and 48: You can change most of these variab
Page 49 and 50: To add instances to the room, first
Page 51 and 52: At the top you will see the backgro
Page 53 and 54: When you start Game Maker in advanc
Page 55 and 56: • Show the origin and bounding bo
Page 57 and 58: Editing your sprites Up to now we l
Page 59 and 60: • Scale. This command scales the
Page 61 and 62: • Disappear. Makes the image disa
Page 63 and 64: Once you selected the correct set o
Page 65 and 66: • Clear. Clear the image to the l
Page 67 and 68: Multiple normal sounds can play at
Page 69 and 70: You can indicate a number of settin
Page 71 and 72: When a ball hits the floor it must
Page 73 and 74: action it lets the instance take a
Page 75 and 76: The following additional draw actio
Page 77 and 78: dies. The transparency slowly chang
Page 79 and 80: 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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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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