C# GraphPane.CalcScaleFactor方法代码示例

        /// <summary>
        /// Determine the coords for the rectangle associated with a specified point for 
        /// this <see cref="CurveItem" />
        /// </summary>
        /// <param name="pane">The <see cref="GraphPane" /> to which this curve belongs</param>
        /// <param name="i">The index of the point of interest</param>
        /// <param name="coords">A list of coordinates that represents the "rect" for
        /// this point (used in an html AREA tag)</param>
        /// <returns>true if it's a valid point, false otherwise</returns>
        public override bool GetCoords( GraphPane pane, int i, out string coords )
        {
            coords = string.Empty;

            if ( i < 0 || i >= _points.Count )
                return false;

            Axis valueAxis = ValueAxis( pane );
            Axis baseAxis = BaseAxis( pane );

            float scaledSize = _bar.Symbol.Size * pane.CalcScaleFactor();

            // pixBase = pixel value for the bar center on the base axis
            // pixHiVal = pixel value for the bar top on the value axis
            // pixLowVal = pixel value for the bar bottom on the value axis
            float pixBase, pixHiVal, pixLowVal;

            float clusterWidth = pane.BarSettings.GetClusterWidth();
            float barWidth = GetBarWidth( pane );
            float clusterGap = pane._barSettings.MinClusterGap * barWidth;
            float barGap = barWidth * pane._barSettings.MinBarGap;

            // curBase = the scale value on the base axis of the current bar
            // curHiVal = the scale value on the value axis of the current bar
            // curLowVal = the scale value of the bottom of the bar
            double curBase, curLowVal, curHiVal;
            ValueHandler valueHandler = new ValueHandler( pane, false );
            valueHandler.GetValues( this, i, out curBase, out curLowVal, out curHiVal );

            // Any value set to double max is invalid and should be skipped
            // This is used for calculated values that are out of range, divide
            //   by zero, etc.
            // Also, any value <= zero on a log scale is invalid

            if ( !_points[i].IsInvalid3D )
            {
                // calculate a pixel value for the top of the bar on value axis
                pixLowVal = valueAxis.Scale.Transform( _isOverrideOrdinal, i, curLowVal );
                pixHiVal = valueAxis.Scale.Transform( _isOverrideOrdinal, i, curHiVal );
                // calculate a pixel value for the center of the bar on the base axis
                pixBase = baseAxis.Scale.Transform( _isOverrideOrdinal, i, curBase );

                // Calculate the pixel location for the side of the bar (on the base axis)
                float pixSide = pixBase - scaledSize / 2.0F;

                // Draw the bar
                if ( baseAxis is XAxis || baseAxis is X2Axis )
                    coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
                                pixSide, pixLowVal,
                                pixSide + scaledSize, pixHiVal );
                else
                    coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
                                pixLowVal, pixSide,
                                pixHiVal, pixSide + scaledSize );

                return true;
            }

            return false;
        }

        /// <summary>
        /// Determine the coords for the rectangle associated with a specified point for 
        /// this <see cref="CurveItem" />
        /// </summary>
        /// <param name="pane">The <see cref="GraphPane" /> to which this curve belongs</param>
        /// <param name="i">The index of the point of interest</param>
        /// <param name="coords">A list of coordinates that represents the "rect" for
        /// this point (used in an html AREA tag)</param>
        /// <returns>true if it's a valid point, false otherwise</returns>
        public override bool GetCoords( GraphPane pane, int i, out string coords )
        {
            coords = string.Empty;

            if ( i < 0 || i >= _points.Count )
                return false;

            PointPair pt = _points[i];
            if ( pt.IsInvalid )
                return false;

            double x, y, z;
            ValueHandler valueHandler = new ValueHandler( pane, false );
            valueHandler.GetValues( this, i, out x, out z, out y );

            Axis yAxis = GetYAxis( pane );
            Axis xAxis = GetXAxis( pane );

            PointF pixPt = new PointF( xAxis.Scale.Transform( _isOverrideOrdinal, i, x ),
                            yAxis.Scale.Transform( _isOverrideOrdinal, i, y ) );

            if ( !pane.Chart.Rect.Contains( pixPt ) )
                return false;

            float halfSize = _symbol.Size * pane.CalcScaleFactor();

            coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
                    pixPt.X - halfSize, pixPt.Y - halfSize,
                    pixPt.X + halfSize, pixPt.Y + halfSize );

            return true;
        }

        /// <summary>
        /// Calculate the width of each bar, depending on the actual bar type
        /// </summary>
        /// <returns>The width for an individual bar, in pixel units</returns>
        public float GetBarWidth( GraphPane pane )
        {
            // Total axis width =
            // npts * ( nbars * ( bar + bargap ) - bargap + clustgap )
            // cg * bar = cluster gap
            // npts = max number of points in any curve
            // nbars = total number of curves that are of type IsBar
            // bar = bar width
            // bg * bar = bar gap
            // therefore:
            // totwidth = npts * ( nbars * (bar + bg*bar) - bg*bar + cg*bar )
            // totwidth = bar * ( npts * ( nbars * ( 1 + bg ) - bg + cg ) )
            // solve for bar

            float barWidth;

            if ( this is ErrorBarItem )
                barWidth = (float) ( ((ErrorBarItem)this).Bar.Symbol.Size *
                        pane.CalcScaleFactor() );
            //			else if ( this is HiLowBarItem && pane._barSettings.Type != BarType.ClusterHiLow )
            //				barWidth = (float) ( ((HiLowBarItem)this).Bar.GetBarWidth( pane,
            //						((HiLowBarItem)this).BaseAxis(pane), pane.CalcScaleFactor() ) );
            //				barWidth = (float) ( ((HiLowBarItem)this).Bar.Size *
            //						pane.CalcScaleFactor() );
            else // BarItem or LineItem
            {
                // For stacked bar types, the bar width will be based on a single bar
                float numBars = 1.0F;
                if ( pane._barSettings.Type == BarType.Cluster )
                    numBars = pane.CurveList.NumClusterableBars;

                float denom = numBars * ( 1.0F + pane._barSettings.MinBarGap ) -
                            pane._barSettings.MinBarGap + pane._barSettings.MinClusterGap;
                if ( denom <= 0 )
                    denom = 1;
                barWidth = pane.BarSettings.GetClusterWidth() / denom;
            }

            if ( barWidth <= 0 )
                return 1;

            return barWidth;
        }

        /// <summary>
        /// Determine the coords for the rectangle associated with a specified point for 
        /// this <see cref="CurveItem" />
        /// </summary>
        /// <param name="pane">The <see cref="GraphPane" /> to which this curve belongs</param>
        /// <param name="i">The index of the point of interest</param>
        /// <param name="coords">A list of coordinates that represents the "rect" for
        /// this point (used in an html AREA tag)</param>
        /// <returns>true if it's a valid point, false otherwise</returns>
        public override bool GetCoords( GraphPane pane, int i, out string coords )
        {
            coords = string.Empty;

            if ( i < 0 || i >= _points.Count )
                return false;

            Axis valueAxis = ValueAxis( pane );
            Axis baseAxis = BaseAxis( pane );

            float halfSize = _stick.Size * pane.CalcScaleFactor();

            PointPair pt = _points[i];
            double date = pt.X;
            double high = pt.Y;
            double low = pt.Z;

            if ( !pt.IsInvalid3D &&
                    ( date > 0 || !baseAxis._scale.IsLog ) &&
                    ( ( high > 0 && low > 0 ) || !valueAxis._scale.IsLog ) )
            {
                float pixBase, pixHigh, pixLow;
                pixBase = baseAxis.Scale.Transform( _isOverrideOrdinal, i, date );
                pixHigh = valueAxis.Scale.Transform( _isOverrideOrdinal, i, high );
                pixLow = valueAxis.Scale.Transform( _isOverrideOrdinal, i, low );

                // Calculate the pixel location for the side of the bar (on the base axis)
                float pixSide = pixBase - halfSize;

                // Draw the bar
                if ( baseAxis is XAxis || baseAxis is X2Axis )
                    coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
                                pixSide, pixLow,
                                pixSide + halfSize * 2, pixHigh );
                else
                    coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
                                pixLow, pixSide,
                                pixHigh, pixSide + halfSize * 2 );

                return true;
            }

            return false;
        }