public void RenderChart()
{
//Console.WriteLine($"Dates size: {DatesList.Count()}");
//Console.WriteLine($"Values size: {ValuesList.Count()}");
//Console.WriteLine($"First Date: {DatesList.First().ToString()}");
//Console.WriteLine($"First value: {ValuesList.First().Item1.ToString()} - {ValuesList.First().Item2.ToString()}");
// clear the canvas / fill with white
canvas.Clear(SKColors.White);
// set up drawing tools
using (var paint = new SKPaint())
{
paint.IsAntialias = true;
paint.Color = new SKColor(0x2c, 0x3e, 0x50);
paint.StrokeCap = SKStrokeCap.Round;
var xCoordStart = new Point(0 + (width / 20), heigh - (heigh / 3));
var xCoordEnd = new Point(width - (width / 20), heigh - (heigh / 3));
var yCoordStart = new Point(0 + (width / 20), heigh - (heigh / 3));
var yCoordEnd = new Point(0 + (width / 20), 0 + (heigh / 95));
var zCoordStart = new Point(width - (width / 20), xCoordStart.Y - 150);
var zCoordEnd = new Point(width - (width / 20), xCoordStart.Y + 150);
canvas.DrawLine(xCoordStart.X, xCoordStart.Y, xCoordEnd.X, xCoordEnd.Y, new SKPaint());
canvas.DrawLine(yCoordStart.X, yCoordStart.Y, yCoordEnd.X, yCoordEnd.Y, new SKPaint());
canvas.DrawLine(zCoordStart.X, zCoordStart.Y, zCoordEnd.X, zCoordEnd.Y, new SKPaint());
//TODO: temporary workaround ;)
canvas.DrawLine(zCoordStart.X, zCoordStart.Y - 200, zCoordEnd.X, zCoordEnd.Y, new SKPaint());
//assume: data to x and y coord are ordered
//map xcoord between xstart and xend;
var xRange = xCoordEnd.X - xCoordStart.X;
var xPlotUnit = xRange / DatesList.Count;
//map ycoord between ystart and yend
var yRange = yCoordStart.Y - yCoordEnd.Y;
var yPlotUnit = yRange / (float)(Values.Select(n => n.Item1).Max() - Values.Select(n => n.Item1).Min());
//map zcoord between zstart and zend
var zRange = zCoordStart.Y - zCoordEnd.Y;
var zPlotUnit = zRange / (float)(Gains.Max() - Gains.Min());
var maxGains = GainsList.Max();
var minGains = GainsList.Min();
//Plot the values
for (int i = 0; i < DatesList.Count; i++)
{
var xCoord = xCoordStart.X + (i * xPlotUnit);
var yCoord = yCoordStart.Y - (yPlotUnit * (float)(ValuesList[i].Item1 - Values.Select(n => n.Item1).Min()));
//canvas.DrawPoint(xCoord,yCoord, new SKPaint());
var skPaint = new SKPaint();
switch (ValuesList[i].Item2)
{
case PointColor.Green:
skPaint.Color = new SKColor(0, 255, 0);
break;
case PointColor.Red:
skPaint.Color = new SKColor(255, 0, 0);
break;
default:
break;
}
canvas.DrawCircle(xCoord, yCoord, 1, skPaint);
var gainyCoord = zCoordEnd.Y - 150 + (zPlotUnit * (float)(GainsList[i]));
if (GainsList[i] == maxGains || GainsList[i] == minGains)
{
canvas.DrawLine(zCoordEnd.X - 5, gainyCoord, zCoordEnd.X + 5, gainyCoord, new SKPaint());
var plusSign = GainsList[i] > 0 ? "+" : String.Empty;
canvas.DrawText(plusSign + (int)GainsList[i] + "%", zCoordEnd.X + 8, gainyCoord + 5, new SKPaint());
}
canvas.DrawCircle(xCoord, gainyCoord, 1, new SKPaint());
}
canvas.DrawText("0%", zCoordEnd.X + 8, zCoordEnd.Y - 153, new SKPaint());
//add x labels
var nOfXLabels = 8;
var xLabelPlotUnit = xRange / (nOfXLabels - 1);
for (int i = 0; i < (nOfXLabels - 1); i++)
{
canvas.DrawLine(xCoordStart.X + (xLabelPlotUnit * i),
yCoordStart.Y - 5, xCoordStart.X + (xLabelPlotUnit * i), yCoordStart.Y + 5,
new SKPaint());
var txt = DatesList[(i) * DatesList.Count() / (nOfXLabels - 1)].ToShortDateString();
canvas.DrawText(txt, xCoordStart.X + (xLabelPlotUnit * i) - 35,
yCoordStart.Y + 25, new SKPaint());
}
canvas.DrawLine(xCoordEnd.X,
yCoordStart.Y - 5, xCoordEnd.X, yCoordStart.Y + 5,
new SKPaint());
canvas.DrawText(Dates.Last().ToShortDateString(), xCoordEnd.X - 35,
yCoordStart.Y + 25, new SKPaint());
//add y labels
var nOfYLabels = 8;
var yLabelPlotUnit = yRange / (nOfYLabels - 1);
var vv = (float)(Values.Select(n => n.Item1).Max() - Values.Select(n => n.Item1).Min());
var vv2 = vv / (nOfYLabels - 1);
for (int i = 0; i < (nOfYLabels - 1); i++)
{
canvas.DrawLine(yCoordStart.X - 5, yCoordStart.Y - (yLabelPlotUnit * i),
yCoordStart.X + 5, yCoordStart.Y - (yLabelPlotUnit * i), new SKPaint());
var val = Values.Select(n => n.Item1).Min() + (Decimal)i * (decimal)vv2;
canvas.DrawText(((int)val).ToString(), yCoordStart.X - 38,
yCoordStart.Y - (yLabelPlotUnit * i) + 5, new SKPaint());
}
canvas.DrawLine(yCoordStart.X - 5, yCoordEnd.Y - 1,
yCoordStart.X + 5, yCoordEnd.Y - 1, new SKPaint());
canvas.DrawText(((int)Values.Select(n => n.Item1).Max()).ToString(), yCoordStart.X - 38,
yCoordEnd.Y + 5, new SKPaint());
//Add z. label (gains)
}
}