+
+/**
+ * Compares two arrays to see if they are equal. If either parameter is not an
+ * array it will return false. Does a shallow compare
+ * Dygraph.compareArrays([[1,2], [3, 4]], [[1,2], [3,4]]) === false.
+ * @param array1 first array
+ * @param array2 second array
+ * @return True if both parameters are arrays, and contents are equal.
+ */
+Dygraph.compareArrays = function(array1, array2) {
+ if (!Dygraph.isArrayLike(array1) || !Dygraph.isArrayLike(array2)) {
+ return false;
+ }
+ if (array1.length !== array2.length) {
+ return false;
+ }
+ for (var i = 0; i < array1.length; i++) {
+ if (array1[i] !== array2[i]) {
+ return false;
+ }
+ }
+ return true;
+};
+
+/**
+ * ctx: the canvas context
+ * sides: the number of sides in the shape.
+ * radius: the radius of the image.
+ * cx: center x coordate
+ * cy: center y coordinate
+ * rotationRadians: the shift of the initial angle, in radians.
+ * delta: the angle shift for each line. If missing, creates a regular
+ * polygon.
+ */
+Dygraph.regularShape_ = function(
+ ctx, sides, radius, cx, cy, rotationRadians, delta) {
+ rotationRadians = rotationRadians ? rotationRadians : 0;
+ delta = delta ? delta : Math.PI * 2 / sides;
+
+ ctx.beginPath();
+ var first = true;
+ var initialAngle = rotationRadians;
+ var angle = initialAngle;
+
+ var computeCoordinates = function() {
+ var x = cx + (Math.sin(angle) * radius);
+ var y = cy + (-Math.cos(angle) * radius);
+ return [x, y];
+ };
+
+ var initialCoordinates = computeCoordinates();
+ var x = initialCoordinates[0];
+ var y = initialCoordinates[1];
+ ctx.moveTo(x, y);
+
+ for (var idx = 0; idx < sides; idx++) {
+ angle = (idx == sides - 1) ? initialAngle : (angle + delta);
+ var coords = computeCoordinates();
+ ctx.lineTo(coords[0], coords[1]);
+ }
+ ctx.fill();
+ ctx.stroke();
+}
+
+Dygraph.shapeFunction_ = function(sides, rotationRadians, delta) {
+ return function(g, name, ctx, cx, cy, color, radius) {
+ ctx.strokeStyle = color;
+ ctx.fillStyle = "white";
+ Dygraph.regularShape_(ctx, sides, radius, cx, cy, rotationRadians, delta);
+ };
+};
+
+Dygraph.DrawPolygon_ = function(sides, rotationRadians, ctx, cx, cy, color, radius, delta) {
+ new Dygraph.RegularShape_(sides, rotationRadians, delta).draw(ctx, cx, cy, radius);
+}
+
+Dygraph.Circles = {
+ DEFAULT : function(g, name, ctx, canvasx, canvasy, color, radius) {
+ ctx.beginPath();
+ ctx.fillStyle = color;
+ ctx.arc(canvasx, canvasy, radius, 0, 2 * Math.PI, false);
+ ctx.fill();
+ },
+ TRIANGLE : Dygraph.shapeFunction_(3),
+ SQUARE : Dygraph.shapeFunction_(4, Math.PI / 4),
+ DIAMOND : Dygraph.shapeFunction_(4),
+ PENTAGON : Dygraph.shapeFunction_(5),
+ HEXAGON : Dygraph.shapeFunction_(6),
+ CIRCLE : function(g, name, ctx, cx, cy, color, radius) {
+ ctx.beginPath();
+ ctx.strokeStyle = color;
+ ctx.fillStyle = "white";
+ ctx.arc(cx, cy, radius, 0, 2 * Math.PI, false);
+ ctx.fill();
+ ctx.stroke();
+ },
+ STAR : Dygraph.shapeFunction_(5, 0, 4 * Math.PI / 5),
+ PLUS : function(g, name, ctx, cx, cy, color, radius) {
+ ctx.strokeStyle = color;
+
+ ctx.beginPath();
+ ctx.moveTo(cx + radius, cy);
+ ctx.lineTo(cx - radius, cy);
+ ctx.closePath();
+ ctx.stroke();
+
+ ctx.beginPath();
+ ctx.moveTo(cx, cy + radius);
+ ctx.lineTo(cx, cy - radius);
+ ctx.closePath();
+ ctx.stroke();
+ },
+ EX : function(g, name, ctx, cx, cy, color, radius) {
+ ctx.strokeStyle = color;
+
+ ctx.beginPath();
+ ctx.moveTo(cx + radius, cy + radius);
+ ctx.lineTo(cx - radius, cy - radius);
+ ctx.closePath();
+ ctx.stroke();
+
+ ctx.beginPath();
+ ctx.moveTo(cx + radius, cy - radius);
+ ctx.lineTo(cx - radius, cy + radius);
+ ctx.closePath();
+ ctx.stroke();
+ }
+};