[Plot] Add 2d chart

Add skeleton class for implementation of charting
functionality which uses canvas' 2D API for rendering,
WTD-1070.

platform/features/plot/src/Canvas2DChart.js

@@ -0,0 +1,59 @@
+/*global define,Float32Array*/
+
+define(
+    [],
+    function () {
+        "use strict";
+
+        /**
+         * Create a new chart which uses Canvas's 2D API for rendering.
+         *
+         * @constructor
+         * @param {CanvasElement} canvas the canvas object to render upon
+         * @throws {Error} an error is thrown if WebGL is unavailable.
+         */
+        function Canvas2DChart(canvas) {
+            return {
+                /**
+                 * Clear the chart.
+                 */
+                clear: function () {
+                },
+                /**
+                 * Set the logical boundaries of the chart.
+                 * @param {number[]} dimensions the horizontal and
+                 *        vertical dimensions of the chart
+                 * @param {number[]} origin the horizontal/vertical
+                 *        origin of the chart
+                 */
+                setDimensions: function (dimensions, origin) {
+                },
+                /**
+                 * Draw the supplied buffer as a line strip (a sequence
+                 * of line segments), in the chosen color.
+                 * @param {Float32Array} buf the line strip to draw,
+                 *        in alternating x/y positions
+                 * @param {number[]} color the color to use when drawing
+                 *        the line, as an RGBA color where each element
+                 *        is in the range of 0.0-1.0
+                 * @param {number} points the number of points to draw
+                 */
+                drawLine: function (buf, color, points) {
+                },
+                /**
+                 * Draw a rectangle extending from one corner to another,
+                 * in the chosen color.
+                 * @param {number[]} min the first corner of the rectangle
+                 * @param {number[]} max the opposite corner
+                 * @param {number[]} color the color to use when drawing
+                 *        the rectangle, as an RGBA color where each element
+                 *        is in the range of 0.0-1.0
+                 */
+                drawSquare: function (min, max, color) {
+                }
+            };
+        }
+
+        return Canvas2DChart;
+    }
+);