⚂ Does not live in a pineapple under the sea.
I do not know the exact name of this visual effect (angular/clockwise fade-in/fade-out?), but it is one of the most common things that you can see in interface of RPG and RTS games, displaying progress of construction/upgrade/ability cooldown. So, to the point...
You can read how this is actually being implemented, or just scroll down to the bottom of post and grab the code and/or GMK file.
Implementation of such is actually pretty simple,
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If you are working with GameMaker, you might have wandered, how to make paths similar to standard ones but in 3 dimensions, or how to efficiently draw path of non-1px width, or other things not covered by path functions.
For this reason, I have made the following function:
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By user request on Love2d IRC channel, yesterday I've made this nice function to do intersection/collision check between a ray (for clearance, here, a ray is a infinite line with starting point but no end point) and a circle.
Underlying code is fairly simple, though it does not even require understanding to use the function.
Love2d version takes advantage of multi-return values.
Haxe version has slightly longer code due for more optimal implementation of interface.
Download Haxe .hx Download Love2d .love
Snip:
--[[ Does a ray-circle intersection test. Parameters: x1, y1, di - x, y, direction (radians) of ray x, y, r - position & radius of circle Returns: result - whether collision occurred x - collision X y - collision Y distance - distance from ray start to collision point ]] function ray2circle(x1, y1, di, x, y, r) local vx = math.cos(di) local vy = math.sin(di) -- get relative XY of circle (relative to ray origin): x = x - x1 y = y - y1 -- rotate it based on ray direction (as if ray starts at XY=0 and goes at +X): local tx = x * vx + y * vy local ty = x * vy + y * -vx -- clear misses: if (tx < -r) or (ty > r) or (ty < -r) then return false, nil, nil, nil end -- find X coordinate that line hits rotated circle at th = math.abs(math.cos(math.asin(ty / r))) * r -- too far behind if (tx + th < 0) then return false, nil, nil, nil end -- line start is inside the circle: tx = tx - th if (tx < 0) then return true, x1, y1, 0 end -- return true, x1 + tx * vx, y1 + tx * vy, tx end
A very rushed Haxe version to demonstrate how it looks in motion.
Does not necessarily represent features of love2d version in this post.
This was originally going to be a short reply-fix for a topic on love2d forum, but it seems that author did get somewhere with figuring that out on ones own, and I've quite overdone it in terms of a simple answer, so I formatted the code nicely, added several more features, and made this example.
Just in case above demonstration does not work, this example demonstrates a specific approach to game dynamic, where game logic occurs once per interval, while things are drawn and receive input at higher rate. I do not recall any actual platformer games that would use this principle, but a good example of such game is Snake (original grid-based version).
Example includes grid-to-point collision checking, actual specific platformer behaviour (with adjustable values), and value tweening (to make player movement nice & smooth).
Definition file in action, displaying syntax for function of fancy purpose.
In past few days I've spent some time to update an existing user definition file to UDL2, which was introduced in Notepad++ v6.2.
UDL2 improves possibilities of creating user defined languages slightly, introducing configurable delimiters, non-symbol operators, foldable comments, and other things.
For the case of Haxe, UDL2 improves detection of symbols, and made it possible to include hexadecimal number declarations, and separate highlighting for regular expressions. A thing that is currently missing out is preprocessor instructions (#if, #else, #end, ...), however, due to nature of these, highlighting is not always needed anyway.
Update: Someone has set up a repository with a more up-to-date version of the UDL file, so you should take a look at that as well.
Alternatively, UDL .xml' contents:
![[dinosaur peeking in from the right] Hey! I now have a newsletter! Come take a look.](https://yal.cc/wp-content/themes/dotpage/images/mailing-list.png)
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This example demonstrates creation of a basic "flawed" AI, that uses a rather plain method of finding path. Such will still make it reach destination in many cases, but will also allow player to "fool" the AI, making it stuck in dead ends or T-intersections (if player is standing right behind the wall).
To illustrate simplicity of concept, example is largely made in Drag & Drop.
Continue readingAs you can see, some things changed around here, and there is everything missing.
This is a temporary effect, caused by fact that I've switched content management system from Chyrp to WordPress.
Pages will be re-added shortly.
Posts will be re-added more or less gradually.
This is a notable change, which will allow to improve some aspects of the website greatly.
Update: most of pages and data have been re-added, even with links kept. Now, slowly re-adding posts front-to-back.
Today I've updated my Tululoo example for analog controls.
If above image isn't very illustrative, these are small on-screen circles, that can be used in applications and games to convert user input from on-screen coordinate to a vector.
In contrast to not very documented example that I've made last spring, this is now presented as an extension.
That has detailed documentation, quite cleaner structure, and more functionality (for example, now it's possible to check if a specific analog control element was pressed, similar to keyboard keys).
As one can probably guess, it also handles touch input on mobile devices accordingly, allowing multiple controllers to be interacted with at once.
(mouseover/click to play GIF)
A 15fps preview of lightning
This is a little post about making a lightning/electric arc effect in GameMaker.
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This is an example of a circular ('wheel') menu in GameMaker.
Example is well-commented, easy to configure, and will automatically adapt to given number of menu items.
Among other things, it demonstrates 'binding' of menu actions without using dynamic functionality, making it compatible with GameMaker: Studio.