From e36914714fc10dbbe7375b5dd85c39446d4363c4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anders=20Engl=C3=B6f=20Ytterstr=C3=B6m?= <yttan@fastmail.se>
Date: Wed, 16 Apr 2025 00:19:52 +0200
Subject: [PATCH] Add Arc component

---
 src/lib/Arc.svelte  | 168 ++++++++++++++++++++++++++++++++++++++++++++
 src/lib/svg-path.ts |  31 ++++++++
 2 files changed, 199 insertions(+)
 create mode 100644 src/lib/Arc.svelte
 create mode 100644 src/lib/svg-path.ts

diff --git a/src/lib/Arc.svelte b/src/lib/Arc.svelte
new file mode 100644
index 0000000..ff5a25e
--- /dev/null
+++ b/src/lib/Arc.svelte
@@ -0,0 +1,168 @@
+<script lang="ts">
+  import DietProgress from "./DietProgress.svelte";
+  import P from "./svg-path";
+  import { gym, cardio, diet } from "./store";
+
+  export const DEG_TO_RAD = Math.PI / 180;
+  export const RAD_TO_DEG = 180 / Math.PI;
+  export const FULL_CIRCLE_IN_RADIANS = 2 * Math.PI;
+
+  const size = 400;
+  const segmentHeight = 16;
+  const span = 0.8 * FULL_CIRCLE_IN_RADIANS;
+  const startAngle = 0.25 * FULL_CIRCLE_IN_RADIANS + span / 2;
+
+  const perimiterWidth = size * Math.PI * (span / FULL_CIRCLE_IN_RADIANS);
+  const pixelToRadians = span / perimiterWidth;
+  const x = 0;
+  const y = 0;
+
+  const points = (radius: number, radLength: number, thickness: number) => {
+    const borderRadius = thickness / 2;
+    const outerRadius = radius;
+    const innerRadius = outerRadius - thickness;
+    const radEndAngle = startAngle - radLength;
+    const borderRadiusAngle =
+      (borderRadius / (outerRadius * FULL_CIRCLE_IN_RADIANS)) *
+      FULL_CIRCLE_IN_RADIANS;
+    const isLongTrack = radLength - 2 * borderRadiusAngle > Math.PI;
+
+    return P()
+      .moveTo(
+        -Math.sin(startAngle) * (outerRadius - borderRadius),
+        Math.cos(startAngle) * (outerRadius - borderRadius),
+      )
+      .arcTo(
+        borderRadius,
+        borderRadius,
+        false,
+        true,
+        -Math.sin(startAngle - borderRadiusAngle) * outerRadius,
+        Math.cos(startAngle - borderRadiusAngle) * outerRadius,
+      )
+      .arcTo(
+        outerRadius,
+        outerRadius,
+        isLongTrack,
+        true,
+        -Math.sin(radEndAngle + borderRadiusAngle) * outerRadius,
+        Math.cos(radEndAngle + borderRadiusAngle) * outerRadius,
+      )
+      .arcTo(
+        borderRadius,
+        borderRadius,
+        false,
+        true,
+        -Math.sin(radEndAngle) * (outerRadius - borderRadius),
+        Math.cos(radEndAngle) * (outerRadius - borderRadius),
+      )
+      .lineTo(
+        -Math.sin(radEndAngle) * (innerRadius + borderRadius),
+        Math.cos(radEndAngle) * (innerRadius + borderRadius),
+      )
+      .arcTo(
+        borderRadius,
+        borderRadius,
+        false,
+        true,
+        -Math.sin(radEndAngle + borderRadiusAngle) * innerRadius,
+        Math.cos(radEndAngle + borderRadiusAngle) * innerRadius,
+      )
+      .arcTo(
+        innerRadius,
+        innerRadius,
+        isLongTrack,
+        false,
+        -Math.sin(startAngle - borderRadiusAngle) * innerRadius,
+        Math.cos(startAngle - borderRadiusAngle) * innerRadius,
+      )
+      .arcTo(
+        borderRadius,
+        borderRadius,
+        false,
+        true,
+        -Math.sin(startAngle) * (innerRadius + borderRadius),
+        Math.cos(startAngle) * (innerRadius + borderRadius),
+      )
+      .close()
+      .stringify();
+  };
+
+  let items = [
+    {
+      c: "gym",
+      progress: $gym.filter((c) => c.completed).length / $gym.length,
+      level: 0,
+    },
+    {
+      c: "cardio",
+      progress: $diet.filter((c) => !c.excluded).length / $cardio.length,
+      level: 1,
+    },
+    {
+      c: "diet",
+      progress:
+        $cardio.filter((c) => c.completed).length /
+        $diet.filter((c) => !c.excluded).length,
+      level: 2,
+    },
+  ];
+</script>
+
+<figure>
+  <svg viewBox="0 0 {size} {size}" role="presentation">
+    <g transform="${`translate(${x},${y})`}" fill="none">
+      <g transform={`translate(${size / 2},${size / 2})`}>
+        {#each items as { c, progress, level }}
+          <path
+            fill="#fff"
+            opacity="0.066"
+            d={points(
+              size / 2 - level * (segmentHeight + 4),
+              span,
+              segmentHeight,
+            )}
+          />
+          <path
+            class={c}
+            fill="currentColor"
+            d={points(
+              size / 2 - level * (segmentHeight + 4),
+              progress * span,
+              segmentHeight,
+            )}
+          />
+        {/each}
+      </g>
+    </g>
+  </svg>
+</figure>
+
+<style>
+  svg {
+    display: block;
+    max-width: 80%;
+    aspect-ratio: 1;
+  }
+
+  figure {
+    display: flex;
+    align-items: center;
+    place-content: center;
+    width: 100%;
+    padding: 0;
+    margin: 2rem 0 1.5rem;
+  }
+
+  .cardio {
+    color: #5dc5f8;
+  }
+
+  .gym {
+    color: #f62b5a;
+  }
+
+  .diet {
+    color: #35d450;
+  }
+</style>
diff --git a/src/lib/svg-path.ts b/src/lib/svg-path.ts
new file mode 100644
index 0000000..e045a35
--- /dev/null
+++ b/src/lib/svg-path.ts
@@ -0,0 +1,31 @@
+export default function () {
+  const commands: string[] = [];
+  return {
+    stringify() {
+      return `${commands.join("\n")}`;
+    },
+    arcTo(
+      ry: number,
+      rx: number,
+      long: boolean,
+      cw: boolean,
+      y: number,
+      x: number,
+    ) {
+      commands.push(`A ${rx} ${ry} 0 ${long ? 1 : 0} ${cw ? 1 : 0} ${x} ${y}`);
+      return this;
+    },
+    moveTo(y: number, x: number) {
+      commands.push(`M ${x} ${y}`);
+      return this;
+    },
+    lineTo(y: number, x: number) {
+      commands.push(`L ${x} ${y}`);
+      return this;
+    },
+    close() {
+      commands.push("z");
+      return this;
+    },
+  };
+}