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SFML Game Development By Example

You're reading from   SFML Game Development By Example Create and develop exciting games from start to finish using SFML

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781785287343
Length 522 pages
Edition 1st Edition
Languages
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Author (1):
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Raimondas Pupius Raimondas Pupius
Author Profile Icon Raimondas Pupius
Raimondas Pupius
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Toc

Table of Contents (16) Chapters Close

Preface 1. It's Alive! It's Alive! – Setup and First Program 2. Give It Some Structure – Building the Game Framework FREE CHAPTER 3. Get Your Hands Dirty – What You Need to Know 4. Grab That Joystick – Input and Event Management 5. Can I Pause This? – Application States 6. Set It in Motion! – Animating and Moving around Your World 7. Rediscovering Fire – Common Game Design Elements 8. The More You Know – Common Game Programming Patterns 9. A Breath of Fresh Air – Entity Component System Continued 10. Can I Click This? – GUI Fundamentals 11. Don't Touch the Red Button! – Implementing the GUI 12. Can You Hear Me Now? – Sound and Music 13. We Have Contact! – Networking Basics 14. Come Play with Us! – Multiplayer Subtleties Index

Defining GUI events


Providing fluid interactivity with the interface and a painless way of associating changes with actions inside your application may be the most important criterion to separate good GUI systems from bad ones. As we are already learning SFML, we can use the SFML method and omit events.

Firstly, we have to define all the possible events that could take place in an interface. Create a GUI_Event.h file and construct an enumeration, as shown here:

enum class GUI_EventType{ None, Click, Release, Hover, Leave };

We must also define a custom structure in the same file that is used to hold event information:

struct ClickCoordinates{
    float x, y;
};

struct GUI_Event{
    GUI_EventType m_type;
    const char* m_element;
    const char* m_interface;
    union{
        ClickCoordinates m_clickCoords;
    };
};

The first thing to talk about here is the structure. It should be possible to merely use sf::Vector2f here. That would work fine under most circumstances but, a few lines below...

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