/// <summary>
/// Draw a pie chart.
/// </summary>
/// <param name="points">Specified points in the series.</param>
private void DrawPieChart(DataPointCollection points, int pieNo)
{
double sizeOfCircle = ((WidthRequest > HeightRequest) ? HeightRequest / 2 : WidthRequest / 2);
double[] values = points.Select(p => p.Value).ToArray();
double degreesPerValue = 360 / values.Sum();
for (int i = 0; i < values.Length; i++)
{
values[i] = values[i] * degreesPerValue;
}
OnDrawPie(this, new DrawEventArgs <PieDrawingData> {
Data = new PieDrawingData(WidthRequest / 2, HeightRequest / 2, pieNo, sizeOfCircle, values)
});
}
/// <summary>
/// Draw text.
/// </summary>
/// <param name="highestValue">Highest Y-value possible after drawing the grid.</param>
/// <param name="widthPerBar">Width of a single bar.</param>
/// <param name="points">Specified points in the series.</param>
private void DrawLabels(double highestValue, double widthPerBar, DataPointCollection points)
{
int noOfBarSeries = Series.Count(s => s.Type == ChartType.Bar);
if (noOfBarSeries == 0)
{
noOfBarSeries = 1;
}
double widthOfAllBars = noOfBarSeries * widthPerBar;
double widthIterator = 2 + PADDING_LEFT;
for (int i = 0; i < points.Count; i++)
{
OnDrawText(this, new DrawEventArgs <TextDrawingData>()
{
Data = new TextDrawingData(points[i].Label, (widthIterator + widthOfAllBars / 2) - (points[i].Label.Length * 4), HeightRequest + 25)
});
widthIterator += widthPerBar * noOfBarSeries + Spacing;
}
}
public Series()
{
Points = new DataPointCollection();
}
/// <summary>
/// Draw a line.
/// </summary>
/// <param name="highestValue">Highest Y-value possible after drawing the grid.</param>
/// <param name="widthPerBar">Width of a single bar.</param>
/// <param name="lineNo">The number of the series</param>
/// <param name="points">Specified points in the series.</param>
private void DrawLineChart(double highestValue, double widthPerBar, int lineNo, DataPointCollection points)
{
int noOfBarSeries = Series.Count(s => s.Type == ChartType.Bar);
if (noOfBarSeries == 0)
{
noOfBarSeries = 1;
}
double widthOfAllBars = noOfBarSeries * widthPerBar;
double widthIterator = 2 + PADDING_LEFT;
List <double> pointsList = new List <double>();
double[] previousPoints = new double[2];
for (int i = 0; i < points.Count; i++)
{
double heightOfLine = ((HeightRequest - PADDING_TOP) / highestValue) * points[i].Value;
double x = widthIterator + (widthOfAllBars / 2);
double y = ((HeightRequest - PADDING_TOP) - heightOfLine) + PADDING_TOP;
if (i != 0)
{
OnDrawLine(this, new DrawEventArgs <DoubleDrawingData>()
{
Data = new DoubleDrawingData(previousPoints[0], previousPoints[1], x, y, lineNo)
});
}
previousPoints[0] = x;
previousPoints[1] = y;
OnDrawCircle(this, new DrawEventArgs <SingleDrawingData>()
{
Data = new SingleDrawingData(widthIterator + (widthOfAllBars / 2), ((HeightRequest - PADDING_TOP) - heightOfLine) + PADDING_TOP, lineNo)
});
widthIterator += widthPerBar * noOfBarSeries + Spacing;
}
}
/// <summary>
/// Draw a bar.
/// </summary>
/// <param name="highestValue">Highest Y-value possible after drawing the grid.</param>
/// <param name="widthPerBar">Width of a single bar.</param>
/// <param name="barNo">The number of the series</param>
/// <param name="points">Specified points in the series.</param>
private void DrawBarChart(double highestValue, double widthPerBar, int barNo, DataPointCollection points)
{
double widthIterator = 2 + (barNo * widthPerBar) + PADDING_LEFT;
foreach (DataPoint point in points)
{
double heightOfBar = ((HeightRequest - PADDING_TOP) / highestValue) * point.Value;
OnDrawBar(this, new DrawEventArgs <DoubleDrawingData>()
{
Data = new DoubleDrawingData(widthIterator + 1, ((HeightRequest - PADDING_TOP) - heightOfBar) + PADDING_TOP, (widthIterator + widthPerBar) - 1, HeightRequest, barNo)
});
widthIterator += widthPerBar * Series.Count(s => s.Type == ChartType.Bar) + Spacing;
}
}
