private void graphPane_AxisChangeEvent()
{
GraphPane graphPane = zedGraphControl1.GraphPane;
// Correct the scale so that the two axes are 1:1 aspect ratio
double scalex2 = (graphPane.XAxis.Scale.Max - graphPane.XAxis.Scale.Min) / graphPane.Rect.Width;
double scaley2 = (graphPane.YAxis.Scale.Max - graphPane.YAxis.Scale.Min) / graphPane.Rect.Height;
if (scalex2 > scaley2)
{
double diff = graphPane.YAxis.Scale.Max - graphPane.YAxis.Scale.Min;
double new_diff = graphPane.Rect.Height * scalex2;
graphPane.YAxis.Scale.Max = graphPane.YAxis.Scale.Min + new_diff;
//graphPane.YAxis.Scale.Min -= (new_diff - diff) / 2.0;
//graphPane.YAxis.Scale.Max += (new_diff - diff) / 2.0;
}
else if (scaley2 > scalex2)
{
double diff = graphPane.XAxis.Scale.Max - graphPane.XAxis.Scale.Min;
double new_diff = graphPane.Rect.Width * scaley2;
// graphPane.XAxis.Scale.Min -= (new_diff - diff) / 2.0;
//graphPane.XAxis.Scale.Max += (new_diff - diff) / 2.0;
graphPane.XAxis.Scale.Max = graphPane.XAxis.Scale.Min + new_diff;
}
// Recompute the grid lines
float scaleFactor = graphPane.CalcScaleFactor();
Graphics g = zedGraphControl1.CreateGraphics();
graphPane.XAxis.Scale.PickScale(graphPane, g, scaleFactor);
graphPane.YAxis.Scale.PickScale(graphPane, g, scaleFactor);
}
/// <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)
{
float barWidth;
if (this is ErrorBarItem)
{
barWidth = (float)(((ErrorBarItem)this).Bar.Symbol.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);
}
private void graphPane_AxisChangeEvent(GraphPane target) //控制两个坐标轴的显示比例，前提条件是zde控件的外形必修是正方形
{
GraphPane graphPane = GraphControl.GraphPane;
// Correct the scale so that the two axes are 1:1 aspect ratio
double scalex2 = (graphPane.XAxis.Scale.Max - graphPane.XAxis.Scale.Min) / graphPane.Rect.Width;
double scaley2 = (graphPane.YAxis.Scale.Max - graphPane.YAxis.Scale.Min) / graphPane.Rect.Height;
if (scalex2 > scaley2)
{
double diff = graphPane.YAxis.Scale.Max - graphPane.YAxis.Scale.Min;
double new_diff = graphPane.Rect.Height * scalex2;
graphPane.YAxis.Scale.Min -= (new_diff - diff) / 2.0;
graphPane.YAxis.Scale.Max += (new_diff - diff) / 2.0;
}
else if (scaley2 > scalex2)
{
double diff = graphPane.XAxis.Scale.Max - graphPane.XAxis.Scale.Min;
double new_diff = graphPane.Rect.Width * scaley2;
graphPane.XAxis.Scale.Min -= (new_diff - diff) / 2.0;
graphPane.XAxis.Scale.Max += (new_diff - diff) / 2.0;
}
// Recompute the grid lines
float scaleFactor = graphPane.CalcScaleFactor();
Graphics g = GraphControl.CreateGraphics();
graphPane.XAxis.Scale.PickScale(graphPane, g, scaleFactor);
graphPane.YAxis.Scale.PickScale(graphPane, g, scaleFactor);
}
/// <summary>
/// Determine the coords for the rectangle associated with a specified point for
/// this <see c_ref="CurveItem" />
/// </summary>
/// <param name="pane">The <see c_ref="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>
override public 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);
}
/// <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>
override public 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>
/// 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>
override public 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);
}
