/// <summary>
/// Draw this <see cref="CurveItem"/> to the specified <see cref="Graphics"/>
/// device as a symbol at each defined point. The routine
/// only draws the symbols; the lines are draw by the
/// <see cref="Line.DrawCurve"/> method. This method
/// is normally only called by the Draw method of the
/// <see cref="CurveItem"/> object
/// </summary>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see cref="GraphPane"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="curve">A <see cref="LineItem"/> representing this
/// curve.</param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
/// <param name="isSelected">Indicates that the <see cref="Symbol" /> should be drawn
/// with attributes from the <see cref="Selection" /> class.
/// </param>
public void Draw(Graphics g, GraphPane pane, LineItem curve, float scaleFactor,
bool isSelected)
{
if (_type == SymbolType.None)
{
return;
}
Symbol source = this;
if (isSelected)
{
source = Selection.Symbol;
}
int tmpX, tmpY;
int minX = (int)pane.Chart.Rect.Left;
int maxX = (int)pane.Chart.Rect.Right;
int minY = (int)pane.Chart.Rect.Top;
int maxY = (int)pane.Chart.Rect.Bottom;
// (Dale-a-b) we'll set an element to true when it has been drawn
if (isPixelDrawn == null)
{
isPixelDrawn = new MultiDimBitArray(maxX, maxY);
}
else
{
isPixelDrawn.TryResize(maxX, maxY);
}
double curX, curY, lowVal;
IPointList points = curve.Points;
if (points != null && (_border.IsVisible || _fill.IsVisible))
{
SmoothingMode sModeSave = g.SmoothingMode;
if (_isAntiAlias)
{
g.SmoothingMode = SmoothingMode.HighQuality;
}
// For the sake of speed, go ahead and create a solid brush and a pen
// If it's a gradient fill, it will be created on the fly for each symbol
//SolidBrush brush = new SolidBrush( this.fill.Color );
using (Pen pen = source._border.GetPen(pane, scaleFactor))
using (GraphicsPath path = MakePath(g, scaleFactor))
{
RectangleF rect = path.GetBounds();
using (Brush brush = source.Fill.MakeBrush(rect))
{
ValueHandler valueHandler = new ValueHandler(pane, false);
Scale xScale = curve.GetXAxis(pane).Scale;
Scale yScale = curve.GetYAxis(pane).Scale;
bool xIsLog = xScale.IsLog;
bool yIsLog = yScale.IsLog;
bool xIsOrdinal = xScale.IsAnyOrdinal;
double xMin = xScale.Min;
double xMax = xScale.Max;
// Loop over each defined point
for (int i = 0; i < points.Count; i++)
{
// Get the user scale values for the current point
// use the valueHandler only for stacked types
if (pane.LineType == LineType.Stack)
{
valueHandler.GetValues(curve, i, out curX, out lowVal, out curY);
}
// otherwise, just access the values directly. Avoiding the valueHandler for
// non-stacked types is an optimization to minimize overhead in case there are
// a large number of points.
else
{
curX = points[i].X;
if (curve is StickItem)
{
curY = points[i].Z;
}
else
{
curY = points[i].Y;
}
}
// 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 (curX != PointPair.Missing &&
curY != PointPair.Missing &&
!System.Double.IsNaN(curX) &&
!System.Double.IsNaN(curY) &&
!System.Double.IsInfinity(curX) &&
!System.Double.IsInfinity(curY) &&
(curX > 0 || !xIsLog) &&
(!yIsLog || curY > 0.0) &&
(xIsOrdinal || (curX >= xMin && curX <= xMax)))
{
// Transform the user scale values to pixel locations
tmpX = (int)xScale.Transform(curve.IsOverrideOrdinal, i, curX);
tmpY = (int)yScale.Transform(curve.IsOverrideOrdinal, i, curY);
// Maintain an array of "used" pixel locations to avoid duplicate drawing operations
if (tmpX >= minX && tmpX <= maxX && tmpY >= minY && tmpY <= maxY) // guard against the zoom-in case
{
if (isPixelDrawn[tmpX, tmpY])
{
continue;
}
isPixelDrawn[tmpX, tmpY] = true;
}
// If the fill type for this symbol is a Gradient by value type,
// then make a brush corresponding to the appropriate current value
if (_fill.IsGradientValueType || _border._gradientFill.IsGradientValueType)
{
using (Brush tBrush = _fill.MakeBrush(rect, points[i]))
using (Pen tPen = _border.GetPen(pane, scaleFactor, points[i]))
this.DrawSymbol(g, tmpX, tmpY, path, tPen, tBrush);
}
else
{
// Otherwise, the brush is already defined
// Draw the symbol at the specified pixel location
this.DrawSymbol(g, tmpX, tmpY, path, pen, brush);
}
}
}
}
}
g.SmoothingMode = sModeSave;
}
}
/// <summary>
/// Render text to the specified <see cref="Graphics"/> device
/// by calling the Draw method of each <see cref="GraphObj"/> object in
/// the collection.
/// </summary>
/// <remarks>This method is normally only called by the Draw method
/// of the parent <see cref="GraphPane"/> object.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see cref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
/// <param name="zOrder">A <see cref="ZOrder"/> enumeration that controls
/// the placement of this <see cref="GraphObj"/> relative to other
/// graphic objects. The order of <see cref="GraphObj"/>'s with the
/// same <see cref="ZOrder"/> value is control by their order in
/// this <see cref="GraphObjList"/>.</param>
public void Draw(Graphics g, PaneBase pane, float scaleFactor,
ZOrder zOrder)
{
GraphPane graphPane = pane as GraphPane;
int minX = int.MinValue;
int maxX = int.MaxValue;
int minY = int.MinValue;
int maxY = int.MaxValue;
bool isOptDraw = false;
if (graphPane != null)
{
isOptDraw = true;
minX = (int)graphPane.Chart.Rect.Left;
maxX = (int)graphPane.Chart.Rect.Right;
minY = (int)graphPane.Chart.Rect.Top;
maxY = (int)graphPane.Chart.Rect.Bottom;
if (isOptDraw)
{
if (isPixelDrawn == null)
{
isPixelDrawn = new MultiDimBitArray(maxX, maxY);
}
else
{
isPixelDrawn.TryResize(maxX, maxY);
}
}
}
// Draw the items in reverse order, so the last items in the
// list appear behind the first items (consistent with
// CurveList)
List <GraphObj> graphObjs = zOrderList[(int)zOrder];
for (int i = graphObjs.Count - 1; i >= 0; i--)
{
GraphObj item = graphObjs[i];
PointF pix = item.Location.Transform(pane);
if (item.ZOrder == zOrder && item.IsVisible &&
pix.X >= minX && pix.X <= maxX &&
pix.Y >= minY && pix.Y <= maxY)
{
// Don't try to draw where we already drew.
// This is a huge optimization when there are
// many more draw items than pixels in the rectangle.
if (isPixelDrawn[(int)pix.X, (int)pix.Y])
{
continue;
}
isPixelDrawn[(int)pix.X, (int)pix.Y] = true;
Region region = null;
if (item.IsClippedToChartRect && pane is GraphPane)
{
region = g.Clip.Clone();
g.SetClip(((GraphPane)pane).Chart._rect);
}
item.Draw(g, pane, scaleFactor);
if (item.IsClippedToChartRect && pane is GraphPane)
{
g.Clip = region;
}
}
}
}
