/** * Linear gradient. * * @example * Ext.create({ * xtype: 'draw', * renderTo: document.body, * width: 600, * height: 400, * sprites: [{ * type: 'circle', * cx: 100, * cy: 100, * r: 100, * fillStyle: { * type: 'linear', * degrees: 180, * stops: [{ * offset: 0, * color: '#1F6D91' * }, { * offset: 1, * color: '#90BCC9' * }] * } * }] * }); */Ext.define('Ext.draw.gradient.Linear', { extend: 'Ext.draw.gradient.Gradient', requires: ['Ext.draw.Color'], type: 'linear', config: { /** * @cfg {Number} degrees * The angle of rotation of the gradient in degrees. */ degrees: 0, /** * @cfg {Number} radians * The angle of rotation of the gradient in radians. */ radians: 0 }, applyRadians: function (radians, oldRadians) { if (Ext.isNumber(radians)) { return radians; } return oldRadians; }, applyDegrees: function (degrees, oldDegrees) { if (Ext.isNumber(degrees)) { return degrees; } return oldDegrees; }, updateRadians: function (radians) { this.setDegrees(Ext.draw.Draw.degrees(radians)); }, updateDegrees: function (degrees) { this.setRadians(Ext.draw.Draw.rad(degrees)); }, /** * @method generateGradient * @inheritdoc */ generateGradient: function (ctx, bbox) { var angle = this.getRadians(), cos = Math.cos(angle), sin = Math.sin(angle), w = bbox.width, h = bbox.height, cx = bbox.x + w * 0.5, cy = bbox.y + h * 0.5, stops = this.getStops(), ln = stops.length, gradient, l, i; if (Ext.isNumber(cx) && Ext.isNumber(cy) && h > 0 && w > 0) { l = (Math.sqrt(h * h + w * w) * Math.abs(Math.cos(angle - Math.atan(h / w)))) / 2; gradient = ctx.createLinearGradient( cx + cos * l, cy + sin * l, cx - cos * l, cy - sin * l ); for (i = 0; i < ln; i++) { gradient.addColorStop(stops[i].offset, stops[i].color); } return gradient; } return Ext.util.Color.NONE; }});