Ben Tyers - GameMaker: Studio 100 Programming Challenges

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Ben Tyers 2017

Ben Tyers GameMaker: Studio 100 Programming Challenges 10.1007/978-1-4842-2644-5_1

1. Maths Bar Graph

Ben Tyers 1

(1)

Worthing, West Sussex, UK

Electronic supplementary material

The online version of this chapter (doi: 10.1007/978-1-4842-2644-5_1 ) contains supplementary material, which is available to authorized users.

Challenge Outline To accept 5 fieldnames / legends and numerical inputs (a value between 1 and 100), for each input. Display a bar graph showing each value graphically with the corresponding fieldname / legend under each.	Level 2 Beginner 3 Hours Medium 1 Hour Advanced 30 Minutes
Additional Challenge Create an onscreen keyboard to allow appropriate data to be entered. Limit fieldname to between 1 and 20 characters, and check integer value is between 1 and 100. Allow user to specify colour of each bar graph element.	Points In Time 20 Additional 20

Notes on Approaching This Challenge

For this you will need to figure out how to input text and variables in and how to draw text and rectangles using these inputs. A suitable method for storing the inputs would be a 2-dimensional array .

Guide

You can input data in using:

text=get_string("name","");

or

value=get_integer("integer",0);

You can draw a rectangle:

draw_rectangle(10,10,50,50,true);

where the values are x1 , y1 , x2 , y2 , outline

and the last value can be true or false for drawing outline or not.

You can format text, for example, the alignment, font style, and colour:

draw_set_halign(fa_center);

draw_set_font(font_text);

draw_set_colour(c_blue);

Note, that when you set drawing styles - including text alignment, font and colour - they will apply to all future drawings unless set otherwise.

You can repeat a block of code:

repeat(10)

{

//repeats 10 times

}

Ben Tyers 2017

Ben Tyers GameMaker: Studio 100 Programming Challenges 10.1007/978-1-4842-2644-5_2

2. Draggable and Movable Object

Ben Tyers 1

(1)

Worthing, West Sussex, UK

Challenge Outline Create an object with a sprite set. Allow instances of this object to be dragged using the left mouse button.	Level 1 Beginner 45 Minutes Medium 30 Minutes Advanced 12 Minutes
Additional Challenge Create multiple instances. When releasing moved instance over another instance, place above it. If attempting to move from a location where multiple instances are present , only select and move the uppermost one.	Points In Time 10 Additional 20

Notes on Approaching This Challenge

For this challenge you will need to check if the mouse cursor is over an instance. You can do this by checking the ID under the mouse position.

You will also need to compensate for the objects sprite origin.

Guide

You can check whether the mouse is over an instance using:

if position_meeting(mouse_x,mouse_y,id)

{

//do something

}

You can check for the initial mouse press using:

if mouse_check_button_pressed(mb_left)

{

//do something

}

You can check for continued pressing of a button:

if mouse_check_button(mb_left)

{

//do something

}

You can update the instances position to the mouse coordinates:

x=mouse_x;

y=mouse_y;

Ben Tyers 2017

Ben Tyers GameMaker: Studio 100 Programming Challenges 10.1007/978-1-4842-2644-5_3

3. Room Fade In and Out Transition

Ben Tyers 1

(1)

Worthing, West Sussex, UK

Challenge Outline Create a system that fades a room to solid black, goes to a new room, and then fades from black to fully transparent.	Level 1 Beginner 25 Minutes Medium 15 Minutes Advanced 8 Minutes
Additional Challenge Allow the option of setting the fade colour and speed. Add 2 additional fade effects: Scroll in from Side Fade between Rooms	Points In Time 10 Additional 20

Notes on Approaching This Challenge

Youll need to figure out how to draw a solid rectangle and set its alpha that changes over a number of steps.

Guide

You can set alpha for drawing functions using:

draw_set_alpha(value);

Where value is a value between 0 (transparent) and 1 (opaque)

For example:

draw_set_alpha(0.5);

Would set the transparency at 50%.

Note

Apply alpha applies to all future drawing functions until set otherwise. You should set back to 1 when youre done so as not to affect unrelated drawing routines.

You can increase a value gradually each step , for example, by placing this in a Step Event:

value+=0.1;

This would increase by 0.1 per step.

You can decrease a value gradually each step, for example:

value-=0.1;

This would decrease by 0.1 per step.

You can draw a rectangle:

draw_rectangle(10,10,50,50,true);

where the values are x1 , y1 , x2 , y2 , true / false

Where last value can be true or false. True will only draw an outline; false will draw as a solid.

You can check if a value has exceeded another value:

if valuea>valueb

{

//do something

}

Ben Tyers 2017

Ben Tyers GameMaker: Studio 100 Programming Challenges 10.1007/978-1-4842-2644-5_4

4. Typewriter Text Effect

Ben Tyers 1

(1)

Worthing, West Sussex, UK

Challenge Outline To display a string one character at a time. Make a keyboard click sound as each new letter is shown.	Level 2 Beginner 45 minutes Medium 30 Minutes Advanced 8 Minutes
Additional Challenge Allow bold and italic formatting and choice of text colour.	Points In Time 20 Additional 20

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