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      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
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Found the drawImage problem ...

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DareDeveloper

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Found the bug I wrote about in the last post: drawImage worked in Chrome, but Firefox showed a white image.
http://www.procgames.com/raidaces

I was completely on the wrong track when I noticed that it sometimes works in Firefox when I call the update function after waiting 5 seconds.

What surprised me was that every time it worked it rendered images with only brown tiles, so I abandoned that track (well, also because waiting 20seconds did not improve the odds at all).
Because I am really ... and I mean REALLY bad at google searches I suspected color profiles (hey, they were mentioned in a canvas related stackexchange discussion ... wacko.png along with green pixels ... can that be a coincidence?).

When I ruled those out I suspected caching ... that it somehow managed to render the all brown tiles images because one of them was cached at some point.
I confirmed that caches did play a role by using the reproducible way to generate maps. After a refresh, drawImage always worked and sometimes it even showed an old version of an image (not from the current map).

Of course it turned out to be the obvious thing. I need to wait for the load event of the image before I draw it to the canvas.
It is not that this thought had not crossed my mind right away when the error occurred ... for some reason I thought that was not relevant ... probably because I expected images to be transferred from canvas to img elements immediately - and in this case synchronously.

In hindsight it makes sense that the normal rules apply. After all, the image data is read using a dataURL. rolleyes.gif

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Everybody misses the obvious sometimes.

 

By the way, I am glad that you are attacking what most developers avoid in your image issues because you understand that it is vital to your progress. You seem to be making the effort to build a solid foundation. Many want to just skid into the future and hope to drag some accomplishments with image coding behind them.  /O O\

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