widget to print values

packages/codemirror/widget.mjs

@@ -140,3 +140,9 @@ registerWidget('_spectrum', (id, options = {}, pat) => {
   const ctx = getCanvasWidget(id, options).getContext('2d');
   return pat.spectrum({ ...options, ctx, id });
 });
+
+registerWidget('_print', (id, options = {}, pat) => {
+  options = { width: 500, height: 30, ...options };
+  const ctx = getCanvasWidget(id, options).getContext('2d');
+  return pat.print({ ...options, ctx, id });
+});

packages/draw/index.mjs

@@ -4,3 +4,4 @@ export * from './draw.mjs';
 export * from './pianoroll.mjs';
 export * from './spiral.mjs';
 export * from './pitchwheel.mjs';
+export * from './print.mjs';

packages/draw/print.mjs

@@ -0,0 +1,50 @@
+import { getTheme, getDrawContext } from './draw.mjs';
+import { Pattern } from '@strudel/core';
+
+export function print({ haps, ctx, id, margin = 10, fontsize = 24 } = {}) {
+  const w = ctx.canvas.width;
+  const h = ctx.canvas.height;
+  ctx.clearRect(0, 0, w, h);
+  const color = getTheme().foreground;
+
+  ctx.strokeStyle = color;
+  ctx.fillStyle = color;
+  ctx.globalAlpha = 1;
+  ctx.textAlign = 'left';
+
+  haps.forEach((hap) => {
+    if (hap.hasOnset()) {
+      const hapColor = hap.value.color || color;
+      ctx.strokeStyle = hapColor;
+      ctx.fillStyle = hapColor;
+      const { velocity = 1, gain = 1 } = hap.value || {};
+      const alpha = velocity * gain;
+      ctx.globalAlpha = alpha;
+      ctx.font = `${fontsize}px sans-serif`;
+      ctx.fillText(hap.value, 0, fontsize);
+    }
+  });
+
+  return;
+}
+
+Pattern.prototype.print = function (options = {}) {
+  let { ctx = getDrawContext(), id = 1 } = options;
+  this.draw(
+    (haps, time) => {
+      print({
+        ...options,
+        time,
+        ctx,
+        haps: haps.filter((hap) => hap.isActive(time)),
+      });
+    },
+    {
+      lookbehind: 0,
+      lookahead: 0,
+      id,
+    },
+  );
+
+  return this;
+};