Add existing to tracked

node_modules/@cesium/engine/Source/Scene/createBillboardPointCallback.js

@@ -0,0 +1,70 @@
+/**
+ * Creates a {@link createBillboardPointCallback.CanvasFunction} that will create a canvas with a point.
+ *
+ * @param {number} centerAlpha The alpha of the center of the point. The value must be in the range [0.0, 1.0].
+ * @param {string} cssColor The CSS color string.
+ * @param {string} cssOutlineColor The CSS color of the point outline.
+ * @param {number} cssOutlineWidth The width of the outline in pixels.
+ * @param {number} pixelSize The size of the point in pixels.
+ * @return {createBillboardPointCallback.CanvasFunction} The function that will return a canvas with the point drawn on it.
+ *
+ * @private
+ */
+function createBillboardPointCallback(
+  centerAlpha,
+  cssColor,
+  cssOutlineColor,
+  cssOutlineWidth,
+  pixelSize,
+) {
+  return function () {
+    const canvas = document.createElement("canvas");
+
+    const length = pixelSize + 2 * cssOutlineWidth;
+    canvas.height = canvas.width = length;
+
+    const context2D = canvas.getContext("2d");
+    context2D.clearRect(0, 0, length, length);
+
+    if (cssOutlineWidth !== 0) {
+      context2D.beginPath();
+      context2D.arc(length / 2, length / 2, length / 2, 0, 2 * Math.PI, true);
+      context2D.closePath();
+      context2D.fillStyle = cssOutlineColor;
+      context2D.fill();
+      // Punch a hole in the center if needed.
+      if (centerAlpha < 1.0) {
+        context2D.save();
+        context2D.globalCompositeOperation = "destination-out";
+        context2D.beginPath();
+        context2D.arc(
+          length / 2,
+          length / 2,
+          pixelSize / 2,
+          0,
+          2 * Math.PI,
+          true,
+        );
+        context2D.closePath();
+        context2D.fillStyle = "black";
+        context2D.fill();
+        context2D.restore();
+      }
+    }
+
+    context2D.beginPath();
+    context2D.arc(length / 2, length / 2, pixelSize / 2, 0, 2 * Math.PI, true);
+    context2D.closePath();
+    context2D.fillStyle = cssColor;
+    context2D.fill();
+
+    return canvas;
+  };
+}
+
+/**
+ * A function that returns a canvas containing an image of a point.
+ * @callback createBillboardPointCallback.CanvasFunction
+ * @returns {HTMLCanvasElement} The result of the calculation.
+ */
+export default createBillboardPointCallback;