function resizePolar(polarModel, api) {
	        var center = polarModel.get('center');
	        var radius = polarModel.get('radius');
	        var width = api.getWidth();
	        var height = api.getHeight();
	        var parsePercent = numberUtil.parsePercent;

	        this.cx = parsePercent(center[0], width);
	        this.cy = parsePercent(center[1], height);

	        var radiusAxis = this.getRadiusAxis();
	        var size = Math.min(width, height) / 2;
	        // var idx = radiusAxis.inverse ? 1 : 0;
	        radiusAxis.setExtent(0, parsePercent(radius, size));
	    }
Convert a (x, y) point to data
@param {Array.<number>} point
@param {boolean} [clamp=false]
@return {Array.<number>}