1 files changed, 146 insertions, 0 deletions
diff --git a/js/squircle.js b/js/squircle.js
new file mode 100644
index 0000000..063a383
--- /dev/null
+++ b/js/squircle.js
@@ -0,0 +1,146 @@
+const drawSquircle = (ctx, geom, radius, smooth, lineWidth, color) => {
+  const defaultFill = color;
+  const lineWidthOffset = lineWidth / 2;
+  // OPEN LEFT-TOP CORNER
+  ctx.beginPath();
+  ctx.lineTo(radius, lineWidthOffset);
+  // TOP-RIGHT CORNER
+  ctx.lineTo(geom.width - radius, lineWidthOffset);
+  ctx.bezierCurveTo(
+    geom.width - radius / smooth,
+    lineWidthOffset, // first bezier point
+    geom.width - lineWidthOffset,
+    radius / smooth, // second bezier point
+    geom.width - lineWidthOffset,
+    radius // last connect point
+  );
+  // BOTTOM-RIGHT CORNER
+  ctx.lineTo(geom.width - lineWidthOffset, geom.height - radius);
+  ctx.bezierCurveTo(
+    geom.width - lineWidthOffset,
+    geom.height - radius / smooth, // first bezier point
+    geom.width - radius / smooth,
+    geom.height - lineWidthOffset, // second bezier point
+    geom.width - radius,
+    geom.height - lineWidthOffset // last connect point
+  );
+  // BOTTOM-LEFT CORNER
+  ctx.lineTo(radius, geom.height - lineWidthOffset);
+  ctx.bezierCurveTo(
+    radius / smooth,
+    geom.height - lineWidthOffset, // first bezier point
+    lineWidthOffset,
+    geom.height - radius / smooth, // second bezier point
+    lineWidthOffset,
+    geom.height - radius // last connect point
+  );
+  // CLOSE LEFT-TOP CORNER
+  ctx.lineTo(lineWidthOffset, radius);
+  ctx.bezierCurveTo(
+    lineWidthOffset,
+    radius / smooth, // first bezier point
+    radius / smooth,
+    lineWidthOffset, // second bezier point
+    radius,
+    lineWidthOffset // last connect point
+  );
+  ctx.closePath();
+
+  if (lineWidth) {
+    // console.log(lineWidth);
+    ctx.strokeStyle = defaultFill;
+    ctx.lineWidth = lineWidth;
+    ctx.stroke();
+  } else {
+    ctx.fillStyle = defaultFill;
+    ctx.fill();
+  }
+};
+
+if (typeof registerPaint !== "undefined") {
+  class SquircleClass {
+    static get contextOptions() {
+      return { alpha: true };
+    }
+    static get inputProperties() {
+      return [
+        "--squircle-radius",
+        "--squircle-smooth",
+        "--squircle-outline",
+        "--squircle-fill",
+        "--squircle-ratio",
+      ];
+    }
+
+    paint(ctx, geom, properties) {
+      const customRatio = properties.get("--squircle-ratio");
+      const smoothRatio = 10;
+      const distanceRatio = parseFloat(customRatio)
+        ? parseFloat(customRatio)
+        : 1.8;
+      const squircleSmooth = parseFloat(
+        properties.get("--squircle-smooth") * smoothRatio
+      );
+      const squircleRadius =
+        parseInt(properties.get("--squircle-radius"), 10) * distanceRatio;
+      const squrcleOutline = parseFloat(
+        properties.get("--squircle-outline"),
+        10
+      );
+      const squrcleColor = properties
+        .get("--squircle-fill")
+        .toString()
+        .replace(/\s/g, "");
+
+      const isSmooth = () => {
+        if (typeof properties.get("--squircle-smooth")[0] !== "undefined") {
+          if (squircleSmooth === 0) {
+            return 1;
+          }
+          return squircleSmooth;
+        } else {
+          return 10;
+        }
+      };
+
+      const isOutline = () => {
+        if (squrcleOutline) {
+          return squrcleOutline;
+        } else {
+          return 0;
+        }
+      };
+
+      const isColor = () => {
+        if (squrcleColor) {
+          return squrcleColor;
+        } else {
+          return "#f45";
+        }
+      };
+
+      if (squircleRadius < geom.width / 2 && squircleRadius < geom.height / 2) {
+        drawSquircle(
+          ctx,
+          geom,
+          squircleRadius,
+          isSmooth(),
+          isOutline(),
+          isColor()
+        );
+      } else {
+        drawSquircle(
+          ctx,
+          geom,
+          Math.min(geom.width / 2, geom.height / 2),
+          isSmooth(),
+          isOutline(),
+          isColor()
+        );
+      }
+    }
+  }
+
+  // eslint-disable-next-line no-undef
+  registerPaint("squircle", SquircleClass);
+}
+\ No newline at end of file