Saves alt text to the image params

Reviewed-on: #35

poptimal.js

@@ -18,7 +18,7 @@ import {ColourNamer} from './src/components/colour_namer.js';
 
 const CELL = 10;
 const MAG = 2;
-const WIDTH = 20;
+const WIDTH = 200;
 const HEIGHT = WIDTH;
 // number of pixels which have to be visible for a colour to be
 // mentioned in the alt text
@@ -36,10 +36,12 @@ function randomise_params() {
 		f: random.choice(RADIUS_OPTS),
 		r: random.float(0, 0.4),
 	}});
+	const cell = 5 + random.float() * random.float() * 55;
 	return {
 		background: palette[0],
 		palette: palette_name,
-		patterns: patterns
+		patterns: patterns,
+		cell: cell,
 	}
 }
 
@@ -134,18 +136,21 @@ function poptimal_svg(params) {
 	const document = window.document;
 	const container = d3.select(document.body).append("div");
 
-	const dm = new DotMaker(WIDTH);
+	const width = WIDTH / params.cell;
+	const height = WIDTH / params.cell;
+
+	const dm = new DotMaker(width, height);
 
 	const svg = container.append("svg")
-	  .attr("width", WIDTH * CELL * MAG)
-	  .attr("height", HEIGHT * CELL * MAG)
-	  .attr("viewBox", [ 0, 0, WIDTH, HEIGHT ]);
+	  .attr("width", WIDTH * MAG)
+	  .attr("height", HEIGHT * MAG)
+	  .attr("viewBox", [ 0, 0, width, height ]);
 
 	const background = svg.append("rect")
 	  .attr("x", 0)
 	  .attr("y", 0)
-	  .attr("width", WIDTH)
-	  .attr("height", WIDTH)
+	  .attr("width", width)
+	  .attr("height", height)
 	  .attr("fill", params.background);
 
 
@@ -227,7 +232,6 @@ async function main() {
 	const colourf = params.palette === 'grayscale' ? cf['grayscale'] : cf['colour'];
 
 	const namer = new ColourNamer();
-	console.log(`Loading colours ${colourf}`);
 	await namer.load_colours(colourf);
 
 
@@ -250,7 +254,7 @@ async function main() {
   	// so we don't include obscured colours
   	const hist = await get_histogram(imgfile);
 	const alt_text = image_description(namer, params, hist);
-
+	params.alt_text = alt_text;
 	await save_params(paramsfile, params);
 	console.log(alt_text);
 	console.log(imgfile);

src/components/dots.js

@@ -44,10 +44,12 @@ function int_range(v1, v2) {
 }
 
 class DotMaker {
-	constructor(width) {
+	constructor(width, height) {
 		this.width = width;
+		this.height = height;
+		this.wh = 0.5 * (width + height);
 		this.cx = 0.5 * width;
-		this.cy = 0.5 * width;
+		this.cy = 0.5 * height;
 	}
 
 	dots(m, n, clip) {
@@ -55,13 +57,13 @@ class DotMaker {
 			return [];
 		}
 		const ps = [];
-		const is = int_range(-this.width, this.width / m)
+		const is = int_range(-this.width, this.height / m)
 		is.map((i) => {
 			const js = int_range(m * i + (m - n) * this.width, m * i)
 			js.map((j) => {
 				const x = (j - m * i) / (m - n);
 				const y = m * (x + i);
-				if( !clip || (x > 0 && y > 0 && x < this.width && y < this.width) ) {
+				if( !clip || (x > 0 && y > 0 && x < this.width && y < this.height) ) {
 					ps.push({i:i, j:j, x:x, y:y});
 				}
 			});
@@ -78,25 +80,25 @@ class DotMaker {
 	    	case "left":
 	      		return maxr * (this.width - d.x) / this.width;
 	    	case "down":
-	      		return maxr * d.y / this.width;
+	      		return maxr * d.y / this.height;
 	    	case "up":
-	      		return maxr * (this.width - d.y) / this.width;
+	      		return maxr * (this.height - d.y) / this.height;
 	      	case "right-up":
-	      		return 0.5 * maxr * (d.x + this.width - d.y) / this.width;
+	      		return 0.5 * maxr * (d.x + this.height - d.y) / this.wh;
 	      	case "left-up":
-	      		return 0.5 * maxr * (this.width - d.x + this.width - d.y) / this.width;
+	      		return 0.5 * maxr * (this.width - d.x + this.height - d.y) / this.wh;
 	      	case "right-down":
-	      		return 0.5 * maxr * (d.x + d.y) / this.width;
+	      		return 0.5 * maxr * (d.x + d.y) / this.wh;
 	      	case "left-down":
-	      		return 0.5 * maxr * (this.width - d.x + d.y) / this.width;
+	      		return 0.5 * maxr * (this.width - d.x + d.y) / this.wh;
 	      	case "out":
-	      		return 2 * maxr * distance((d.x - this.cx), (d.y - this.cy)) / this.width;
+	      		return 2 * maxr * distance((d.x - this.cx), (d.y - this.cy)) / this.wh;
 	      	case "in":
-	      		return 2 * maxr * (0.5 * this.width - distance((d.x - this.cx), (d.y - this.cy))) / this.width;
+	      		return 2 * maxr * (0.5 * this.wh - distance((d.x - this.cx), (d.y - this.cy))) / this.wh;
 
 	      	// case "hyper-out":
 	      	// 	return 2 * maxr * Math.abs(d.x - this.cx) (d.y - this.cy)) / this.width;
-	      	// case "hyoer-in":
+	      	// case "hyper-in":
 	      	// 	return 2 * maxr * (0.5 * this.width - distance((d.x - this.cx), (d.y - this.cy))) / this.width;
 
 	      	case "noise":

src/components/download.js

@@ -73,7 +73,7 @@ export async function download_as_png (svg) {
   const opts = {
       fitTo: {
         mode: 'width', // If you need to change the size
-        value: 400,
+        value: 1200,
       }
     };
   const resvgJS = new resvg.Resvg(svgstr, opts)

src/index.md

@@ -8,11 +8,11 @@ toc: false
 
 colourful generative patterns using [d3](https://d3js.org/) and [Observable Framework](https://observablehq.com/framework/)
 
-<p>v1.1.1 | by <a href="https://mikelynch.org">mike lynch</a> | <a href="https://aus.social/@mikelynch">@mikelynch@aus.social</a> | <a href="https://git.tilde.town/bombinans/poptimal">source</a></p>
+<p>v1.2.0 | by <a href="https://mikelynch.org">mike lynch</a> | <a href="https://aus.social/@mikelynch">@mikelynch@aus.social</a> | <a href="https://git.tilde.town/bombinans/poptimal">source</a></p>
 
-<div class="grid grid-cols-2">
+<div class="grid grid-cols-3">
 
-  <div class="card">
+  <div class="card grid-colspan-1">
 
 ```js
 
@@ -24,18 +24,26 @@ import random from "npm:random";
 
 import * as resvg from 'npm:@resvg/resvg-wasm';
 
-const CELL = 10;
 const MAG = 2;
-const WIDTH = 20;
-const HEIGHT = WIDTH;
+const WIDTH = 200;
+const HEIGHT = 200;
 
-const dm = new DotMaker(WIDTH);
+const cell_input = Inputs.range([5,60], {value: 10,  label: "cell size"});
+const cell = view(cell_input);
 
-const bg_input = Inputs.color({label: "background", value: d3.color("yellow").formatHex()});
+
+```
+
+
+```js
+
+const bg_input = Inputs.color({
+  label: "background", value: d3.color("white").formatHex()
+});
 const bg = view(bg_input);
 
-const ctrl1 = new DotControls(d3.color("red").formatHex(), RADIUS_OPTS);
-const ctrl2 = new DotControls(d3.color("blue").formatHex(), RADIUS_OPTS);
+const ctrl1 = new DotControls(d3.color("white").formatHex(), RADIUS_OPTS);
+const ctrl2 = new DotControls(d3.color("white").formatHex(), RADIUS_OPTS);
 
 
 const fg1 = view(ctrl1.fg);
@@ -87,6 +95,8 @@ ctrl1.null_grid();
 ctrl2.null_grid();
 palette_input.value = PALETTES.get(rpalette);
 palette_input.dispatchEvent(new Event("input"));
+cell_input.value = 5 + random.float() * random.float() * 55;
+cell_input.dispatchEvent(new Event("input"));
 ctrl1.random_grid();
 ctrl2.random_grid();
 
@@ -113,13 +123,18 @@ if( palette_fn ) {
 ```
 
 </div>
-<div>
+<div class="card grid-colspan-2">
 
 
 ```js
 
-const dots1 = dm.dots(1 / m1, n1, true);
-const dots2 = dm.dots(1 / m2, n2, true);
+const width = WIDTH / cell;
+const height = HEIGHT / cell;
+
+const dm = new DotMaker(width, height);
+
+const dots1 = dm.dots(1 / m1, n1, false);
+const dots2 = dm.dots(1 / m2, n2, false);
 
 
 ```
@@ -129,9 +144,18 @@ const dots2 = dm.dots(1 / m2, n2, true);
 
 
 const svg = d3.create("svg")
-  .attr("width", WIDTH * CELL * MAG)
-  .attr("height", HEIGHT * CELL * MAG)
-  .attr("viewBox", [ 0, 0, WIDTH, HEIGHT ]);
+  .attr("width", WIDTH * MAG)
+  .attr("height", HEIGHT * MAG)
+  .attr("viewBox", [ 0, 0, width, height ]);
+
+
+svg.append("clipPath")
+    .attr("id", "clipRect")
+    .append("rect")
+    .attr("x", 0)
+    .attr("y", 0)
+    .attr("width", width)
+    .attr("height", height);
 
 
 // re transitions: they should only run when updating the palette and
@@ -151,14 +175,15 @@ bg_g.selectAll("rect")
   .join("rect")
   .attr("x", 0)
   .attr("y", 0)
-  .attr("width", WIDTH)
-  .attr("height", WIDTH)
+  .attr("width", width)
+  .attr("height", height)
   .attr("fill", (d) => d.bg)
 ;
 
 
 const dots_g1 = svg.append("g")
-  .attr("id", "dots1");
+  .attr("id", "dots1")
+  .attr("clip-path", "url(#clipRect)");
 
 dots_g1.selectAll("circle")
   .data(dots1)
@@ -168,7 +193,8 @@ dots_g1.selectAll("circle")
   .attr("fill", fg1);
 
 const dots_g2 = svg.append("g")
-  .attr("id", "dots2");
+  .attr("id", "dots2")
+  .attr("clip-path", "url(#clipRect)");
 
 dots_g2.selectAll("circle")
   .data(dots2)
@@ -211,6 +237,7 @@ display(download(() => {
 ```
 (PNGs made with <a href="https://github.com/thx/resvg-js">resvg-wasm</a> in-browser)
 
+</div>
 </div>
 
 <style>