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+Sencha Documentation Project/**
+ * @class Ext.chart.axis.Gauge
+ * @extends Ext.chart.axis.Abstract
+ *
+ * Gauge Axis is the axis to be used with a Gauge series. The Gauge axis
+ * displays numeric data from an interval defined by the `minimum`, `maximum` and
+ * `step` configuration properties. The placement of the numeric data can be changed
+ * by altering the `margin` option that is set to `10` by default.
+ *
+ * A possible configuration for this axis would look like:
+ *
+ * axes: [{
+ * type: 'gauge',
+ * position: 'gauge',
+ * minimum: 0,
+ * maximum: 100,
+ * steps: 10,
+ * margin: 7
+ * }],
+ */
+Ext.define('Ext.chart.axis.Gauge', {
+
+ /* Begin Definitions */
+
+ extend: 'Ext.chart.axis.Abstract',
+
+ /* End Definitions */
+
+ /**
+ * @cfg {Number} minimum (required) the minimum value of the interval to be displayed in the axis.
+ */
+
+ /**
+ * @cfg {Number} maximum (required) the maximum value of the interval to be displayed in the axis.
+ */
+
+ /**
+ * @cfg {Number} steps (required) the number of steps and tick marks to add to the interval.
+ */
+
+ /**
+ * @cfg {Number} margin (optional) the offset positioning of the tick marks and labels in pixels. Default's 10.
+ */
+
+ position: 'gauge',
+
+ alias: 'axis.gauge',
+
+ drawAxis: function(init) {
+ var chart = this.chart,
+ surface = chart.surface,
+ bbox = chart.chartBBox,
+ centerX = bbox.x + (bbox.width / 2),
+ centerY = bbox.y + bbox.height,
+ margin = this.margin || 10,
+ rho = Math.min(bbox.width, 2 * bbox.height) /2 + margin,
+ sprites = [], sprite,
+ steps = this.steps,
+ i, pi = Math.PI,
+ cos = Math.cos,
+ sin = Math.sin;
+
+ if (this.sprites && !chart.resizing) {
+ this.drawLabel();
+ return;
+ }
+
+ if (this.margin >= 0) {
+ if (!this.sprites) {
+ //draw circles
+ for (i = 0; i <= steps; i++) {
+ sprite = surface.add({
+ type: 'path',
+ path: ['M', centerX + (rho - margin) * cos(i / steps * pi - pi),
+ centerY + (rho - margin) * sin(i / steps * pi - pi),
+ 'L', centerX + rho * cos(i / steps * pi - pi),
+ centerY + rho * sin(i / steps * pi - pi), 'Z'],
+ stroke: '#ccc'
+ });
+ sprite.setAttributes({
+ hidden: false
+ }, true);
+ sprites.push(sprite);
+ }
+ } else {
+ sprites = this.sprites;
+ //draw circles
+ for (i = 0; i <= steps; i++) {
+ sprites[i].setAttributes({
+ path: ['M', centerX + (rho - margin) * cos(i / steps * pi - pi),
+ centerY + (rho - margin) * sin(i / steps * pi - pi),
+ 'L', centerX + rho * cos(i / steps * pi - pi),
+ centerY + rho * sin(i / steps * pi - pi), 'Z'],
+ stroke: '#ccc'
+ }, true);
+ }
+ }
+ }
+ this.sprites = sprites;
+ this.drawLabel();
+ if (this.title) {
+ this.drawTitle();
+ }
+ },
+
+ drawTitle: function() {
+ var me = this,
+ chart = me.chart,
+ surface = chart.surface,
+ bbox = chart.chartBBox,
+ labelSprite = me.titleSprite,
+ labelBBox;
+
+ if (!labelSprite) {
+ me.titleSprite = labelSprite = surface.add({
+ type: 'text',
+ zIndex: 2
+ });
+ }
+ labelSprite.setAttributes(Ext.apply({
+ text: me.title
+ }, me.label || {}), true);
+ labelBBox = labelSprite.getBBox();
+ labelSprite.setAttributes({
+ x: bbox.x + (bbox.width / 2) - (labelBBox.width / 2),
+ y: bbox.y + bbox.height - (labelBBox.height / 2) - 4
+ }, true);
+ },
+
+ /**
+ * Updates the {@link #title} of this axis.
+ * @param {String} title
+ */
+ setTitle: function(title) {
+ this.title = title;
+ this.drawTitle();
+ },
+
+ drawLabel: function() {
+ var chart = this.chart,
+ surface = chart.surface,
+ bbox = chart.chartBBox,
+ centerX = bbox.x + (bbox.width / 2),
+ centerY = bbox.y + bbox.height,
+ margin = this.margin || 10,
+ rho = Math.min(bbox.width, 2 * bbox.height) /2 + 2 * margin,
+ round = Math.round,
+ labelArray = [], label,
+ maxValue = this.maximum || 0,
+ steps = this.steps, i = 0,
+ adjY,
+ pi = Math.PI,
+ cos = Math.cos,
+ sin = Math.sin,
+ labelConf = this.label,
+ renderer = labelConf.renderer || function(v) { return v; };
+
+ if (!this.labelArray) {
+ //draw scale
+ for (i = 0; i <= steps; i++) {
+ // TODO Adjust for height of text / 2 instead
+ adjY = (i === 0 || i === steps) ? 7 : 0;
+ label = surface.add({
+ type: 'text',
+ text: renderer(round(i / steps * maxValue)),
+ x: centerX + rho * cos(i / steps * pi - pi),
+ y: centerY + rho * sin(i / steps * pi - pi) - adjY,
+ 'text-anchor': 'middle',
+ 'stroke-width': 0.2,
+ zIndex: 10,
+ stroke: '#333'
+ });
+ label.setAttributes({
+ hidden: false
+ }, true);
+ labelArray.push(label);
+ }
+ }
+ else {
+ labelArray = this.labelArray;
+ //draw values
+ for (i = 0; i <= steps; i++) {
+ // TODO Adjust for height of text / 2 instead
+ adjY = (i === 0 || i === steps) ? 7 : 0;
+ labelArray[i].setAttributes({
+ text: renderer(round(i / steps * maxValue)),
+ x: centerX + rho * cos(i / steps * pi - pi),
+ y: centerY + rho * sin(i / steps * pi - pi) - adjY
+ }, true);
+ }
+ }
+ this.labelArray = labelArray;
+ }
+});
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