source: code/Website/open-flash-chart/ScreenCoordsRadar.as@ 7849

package {
        import flash.geom.Point;

        public class ScreenCoordsRadar extends ScreenCoordsBase
        {
                private var TO_RADIANS:Number = Math.PI / 180;
                private var range:Range;
                private var angles:Number;
                private var angle:Number;
                private var radius:Number;
                
                public function ScreenCoordsRadar( top:Number, left:Number, right:Number, bottom:Number ) {
                        
                        super(top, left, right, bottom);
                        
                        //
                        // if the radar chart has labels this is going to
                        // get updated so they fit onto the screen
                        //
                        this.radius = ( Math.min( this.width, this.height ) / 2.0 );
                }
                
                // axis range, from center to outer edge
                public function set_range( r:Range ): void {
                        this.range = r;
                }
                
                public function get_max():Number {
                        return this.range.max;
                }
                
                // how many axis/spokes
                public function set_angles( a:Number ):void {
                        this.angles = a;
                        this.angle = 360 / a;
                }
                
                public function get_angles():Number {
                        return this.angles;
                }
                
                public function get_radius():Number {
                        
                        return this.radius;
                }
                
                public function reduce_radius():void {
                        this.radius--;
                }
                
                public function get_pos( angle:Number, radius:Number ): flash.geom.Point {
                        
                        // flash assumes 0 degrees is horizontal to the right
                        var a:Number = (angle - 90) * TO_RADIANS;
                        var r:Number = this.get_radius() * radius;
                        
                        var p:flash.geom.Point = new flash.geom.Point(
                                r * Math.cos(a),
                                r * Math.sin(a) );
                                
                        return p;
                }
                
                public override function get_get_x_from_pos_and_y_from_val( index:Number, y:Number, right_axis:Boolean = false ):flash.geom.Point {
                        
                        // rotate
                        var p:flash.geom.Point = this.get_pos( this.angle*index, y / this.range.count() );
                        
                        // translate
                        p.x += this.get_center_x();
                        p.y += this.get_center_y();
                        
                        return p;
                }
                
                public override function get_y_from_val( y:Number, right_axis:Boolean = false ):Number {
                        
                        // rotate
                        var p:flash.geom.Point = this.get_pos( 0, y / this.range.count() );
                        
                        // translate
                        p.y += this.get_center_y();
                        
                        return p.y;
                }
        }
}