planning

node_modules/ol/src/size.js

@@ -0,0 +1,73 @@
+/**
+ * @module ol/size
+ */
+
+/**
+ * An array of numbers representing a size: `[width, height]`.
+ * @typedef {Array<number>} Size
+ * @api
+ */
+
+/**
+ * Returns a buffered size.
+ * @param {Size} size Size.
+ * @param {number} num The amount by which to buffer.
+ * @param {Size} [opt_size] Optional reusable size array.
+ * @return {Size} The buffered size.
+ */
+export function buffer(size, num, opt_size) {
+  if (opt_size === undefined) {
+    opt_size = [0, 0];
+  }
+  opt_size[0] = size[0] + 2 * num;
+  opt_size[1] = size[1] + 2 * num;
+  return opt_size;
+}
+
+/**
+ * Determines if a size has a positive area.
+ * @param {Size} size The size to test.
+ * @return {boolean} The size has a positive area.
+ */
+export function hasArea(size) {
+  return size[0] > 0 && size[1] > 0;
+}
+
+/**
+ * Returns a size scaled by a ratio. The result will be an array of integers.
+ * @param {Size} size Size.
+ * @param {number} ratio Ratio.
+ * @param {Size} [opt_size] Optional reusable size array.
+ * @return {Size} The scaled size.
+ */
+export function scale(size, ratio, opt_size) {
+  if (opt_size === undefined) {
+    opt_size = [0, 0];
+  }
+  opt_size[0] = (size[0] * ratio + 0.5) | 0;
+  opt_size[1] = (size[1] * ratio + 0.5) | 0;
+  return opt_size;
+}
+
+/**
+ * Returns an `Size` array for the passed in number (meaning: square) or
+ * `Size` array.
+ * (meaning: non-square),
+ * @param {number|Size} size Width and height.
+ * @param {Size} [opt_size] Optional reusable size array.
+ * @return {Size} Size.
+ * @api
+ */
+export function toSize(size, opt_size) {
+  if (Array.isArray(size)) {
+    return size;
+  } else {
+    if (opt_size === undefined) {
+      opt_size = [size, size];
+    } else {
+      opt_size[0] = size;
+      opt_size[1] = size;
+    }
+    return opt_size;
+  }
+}