Vanessa Freudenberg
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codefrau.bsky.social
Vanessa Freudenberg
@codefrau.bsky.social
210 followers 130 following 25 posts
I design and implement interactive and collaborative systems:
Co-founder of Croquet.io • Chief Architect Multisynq.io • Creator of Squeak.JS.org • Formerly at Alan Kay’s groups (VPRI.org, CDG Labs, YCR HARC) • Dr (EngD) • German living in Los Angeles 🏳️‍🌈
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codefrau.bsky.social
You wouldn’t believe how long it took me to find my very obvious typo 🤦🏻‍♀️

The symptom was that the output looked red and white 🔴⚪️ when it was supposed to be rainbowey 🌈
#version 300 es in ivec2 xyIdIx; // position in upper 16 bits, id and index in lower 16 bits uniform vec2 screenScale; // half width/height of screen uniform float spotSize; // size of spot uniform uint colorIdx; // start of spots in display table out vec3 v_color; // color of spot vec3 hue(float h) { h = mod(h, 1.0); float r = abs(h * 6.0 - 3.0) - 1.0; float g = 2.0 - abs(h * 6.0 - 2.0); float b = 2.0 - abs(h * 6.0 - 4.0); return clamp(vec3(r, g, b), 0.0, 1.0); } void main() { ivec2 pos = xyIdIx >> ivec2(16, 16); // sign extend 16 bits to 32 uint idx = uint(xyIdIx.y & 65536); // 16 bit index if (idx < colorIdx) { float fraction = float(idx) / float(colorIdx); // map to [0, 1) v_color = hue(float(idx) / float(colorIdx)); // color by table index } else { v_color = vec3(1.0); // default: white } gl_Position = vec4(vec2(pos) / screenScale, 0.0, 1.0); gl_PointSize = spotSize * 512.0 / max(screenScale.x, screenScale.y); }
March 16, 2025 at 5:36 AM
codefrau.bsky.social
“in terms of program debugging difficulty the problem
was a lulu.”
— Ivan Sutherland (1963!), “Sketchpad,” pg. 76
In concept the edge detection problem is trivial. In terms of program time for lines and circles the problem is a small fraction of the total computational load of the system, but in terms of program debugging difficulty the problem was a lulu. For example, the computation of the intersection of a circle with any of the edges of the scope is easy, but computation of the intersection of a circle with all four edges may result in as many as eight intersections, same pairs of which maybe identical, the scope corners. Now which of these intersections are actually to be used as starts of circle arcs?
March 12, 2025 at 3:53 AM
codefrau.bsky.social
I figured out how to keep my fixed-aspect canvas centered but as-large-as-possible in pure CSS 🥳

(I didn’t want to use object-fit because it distorts JS event positions)

Try it here (resize the window or turn your phone) codefrau.github.io/Smalltalk78/...
#canvas { width: auto; height: 100%; } @media (max-aspect-ratio: 4/3) { #canvas { width: 100%; height: auto; } }
March 6, 2025 at 7:35 PM
codefrau.bsky.social
Played a bit more – recursion is fun!

👸🏻🛡️
🐢🐢🐢
🐢🐢
🐢
💃🏻

codepen.io/codefrau/pen...
findShieldBreak = (dmgs, shld, pos=0) => dmgs.length == 0 ? -1 : shld <= dmgs[0] ? pos : findShieldBreak(dmgs.slice(1), shld - dmgs[0], pos + 1)
February 18, 2025 at 6:31 AM
codefrau.bsky.social
findShieldBreak = (dmgs, shld) =>
dmgs.findIndex(dmg => (shld -= dmg) < 0)

👸🏻🛡️🔥🔥🔥🐉

codepen.io/codefrau/pen...
findShieldBreak = (dmgs, shld) => dmgs.findIndex(dmg => (shld -= dmg) < 0)
February 17, 2025 at 10:02 AM
codefrau.bsky.social
That was fun!

function evaluatePostfix(s) {
let a = []
for (let c of s)
a.push(isNaN(+c) ? eval(a.splice(-2).join(c)) : c);
return a.pop()
}

My CodePen does the infix conversion first and evals at the end:

codepen.io/codefrau/pen...
Screenshot of the codepen and its output
February 4, 2025 at 7:49 PM
codefrau.bsky.social
Trying a new profile picture

www.instagram.com/p/CvqRxdlPGsg/
Selfie of me smiling into the camera with asymmetric, purple hair, matching purple lipstick and glasses, in a navy summer dress with small flower ornaments, a golden necklace with a V pendant sitting on a bench in front of an ivy-covered wall
November 28, 2024 at 11:37 PM