src/grid.ts at main · cameron.stream/misaligned · Tangled

A video game where you play as a misaligned AI, deceiving and building power. An experiment in spec-driven development. cameron.tngl.io/misaligned

misaligned src grid.ts

4.6 kB · 87 lines

TypeScript

Blame

· The map is drawn once and kept while the camera is still, so drawing costs what is on the screen and what moves, not the size of the world. What does not move is drawn into three kept canvases, copied each frame: the sites, the rooms, the lines between sites that stand still and the quiet wires; the machines with nothing moving on them (with the game stopped, every machine); and the machines' names. Over them each frame: busy wires, moving lines, streams, your machines while the game runs, people, raids and the rest. A kept layer is drawn again when the camera, the window, what is picked or pointed at, who holds what, the folds or routes change, at once after any input, and while the game runs at most every quarter second (the site summaries it shows refresh on that beat anyway). While the camera moves, a kept copy would be thrown away next frame, so the map is drawn straight onto the screen as before. Machines and links are found from grids of where they lie, not by a walk over the world; labels keep off each other through a grid too, and text widths are measured once. Pulled back to the map, the streams between two sites are summed into one stream each way, and of your moving lines between two sites only the one that says most is drawn. Site counts, clusters and the wiring are worked out on the slow beat, the integrities at most once a second, and nothing on that beat while the game is stopped. Kept layers keep their tips, and the canvas state they leave, so what is drawn after them is the same either way. On the big world (5155 machines) draw() JS in headless Chromium, stopped and still, goes from 18.3 / 15.3 / 22.6 / 25.2 ms to 2.4 / 1.4 / 1.8 / 2.4 at world / region / cloud hall / office (npm run perf:draw); while panning about 4 / 3 / 4 / 4, and running at 1x about 2 / 1 / 2 / 3. Screenshots of the late save, still and moving, match the old drawing to the pixel except where a moving line between sites now lies over a still one, and the summed streams pulled back. DESIGN: streams pulled back. · 1w ago