This is a blog post about aiming ahead to hit moving targets! It has interactive elements.
Continue readingCategory Archives: Generic
Grid-based contour traversal
This is a small post about the algorithm I wrote for the recent pixel font tool to establish paths of shapes and holes on the image.
Continue readingA small guide on writing interpreters, part 2
label hello: select dialog("Hello! What would you like to do?") { option "Count to 5": for (var i = 1; i <= 5; i = i + 1) { wait(1); trace(i + "!"); } return 1; option "Nothing": jump yousure; } label yousure: select dialog("You sure?") { option "Yes": trace("Well then,"); return 0; option "No": jump hello; }
Example of supported syntax
As some might remember, earlier this year I have published a small guide on writing interpreters, which went over the process of implementing a basic interpreter capable of evaluating expressions consisting of numbers, operators, and variables.
This continuation of the guide further expands upon concept, outlining how to support calls, statements, and branching - enough for a small scripting language.
Continue readingSimple intersection checking between rotated rectangles and circles/points
(click to interact)
(mouseover/click to play GIF)
(click and drag to adjust rectangle size/position/rotation; distance to a circle is shown)
Suppose you have a rotated rectangle and a basic shape that rotation doesn't matter for (such as a point, circle, or a line segment), and you want to check whether the two are intersecting - be that for collision handling, hit testing, or whatever else.
On a glance this might seem like a bother because things are rarely too simple with rotated rectangles, but in this case it isn't - because you can "unrotate" the rectangle.
This small post is about that.
Continue reading2d pivot points explained
(click to interact)
(mouseover/click to play GIF)
(spaceship graphic by Kenney)
Nowadays, most development tools provide ways of setting pivot/center point for imagery - that is, the relative point around which the image will rotate and usually be positioned relative to.
However, ability to define multiple pivot points per image remains relatively uncommon, despite being something that you want to have projectiles fire from a correct point of a sprite, display weapons/attachements at right relative points, or do anything else that demands relative offsets.
This small post is about that.
Continue readingConverting key code to key name and vice-versa
(click to interact)
(mouseover/click to play GIF)
Interactive demo (if JavaScript is enabled)
This is a small post about how to convert key codes to key names and/or convert key names to key codes. Comes with sample code for GameMaker and a generic version.
Mostly published because it covers majority of common and semi-common buttons.
Continue readingA small guide on writing interpreters
This is an average-length (~10 pages) blog post about how to write a parser, AST builder, bytecode compiler, and a bytecode interpreter - in general, and in GameMaker specifically.
Continue readingGameMaker: Using external version control
Over time, I have witnessed a particular scenario a few too many times:
- A person demonstrates complete unwillingness to learn how to use version control, be that due to "lack of need" or delightful claims of their existing approaches (which most often turn out to be manual backups) being sufficient or even superior.
- A person loses days, weeks, or even months of work due to human error and/or hardware failure(s).
- Noticeably bitter about the situation, a person attempts to continue defending their position.
Having spent far too much time arguing with people and explaining how to use version control, I have decided to make a blog post that would cover a few things on the matter:
- Explain the advantages of version control over "simpler" backups.
- Explain (step-by-step) the basics of using a common combination for version control being BitBucket (service) + Git (software) + SourceTree (GUI client).
While this tutorial is oriented on GameMaker: Studio users, it can also be easily applied for other tools.
Continue readingRectangle-circle intersection test
This is a blog post about handling circle-rectangle collisions. For some reason, these seem to be generally regarded as something complicated, even though they aren't.
Continue readingUnderstanding isometric grids
A GIF of the interactive demo seen later in this post.
Questions about the algorithms related to isometric grids are not uncommon. In fact, they are a little more common than you could expect them to be, given the relative simplicity of things.
So I have decided to write a little blog post on the two things important here:
- Converting local isometric grid' coordinates to global screen-space coordinates
- Converting global/screen-space coordinates to isometric grid' local coordinates