public static void DrawGrid(SKCanvas canvas, GridSize gridSize, Padding padding, List <string> xAxis, List <string> yAxis, string title, List <string> secondYAxis = null)
{
// TODO consider what to do with the last entry -> add empty label?
int columns = xAxis.Count - 1;
int rows = yAxis.Count - 1;
var labelPaint = MediumTextPaint;
// draw columns
for (int i = 0; i <= columns; i++)
{
canvas.DrawText($"{xAxis[i]}", new SKPoint(gridSize.XMin + (i * (gridSize.XSize / columns)) - 25, gridSize.YMin + labelPaint.TextSize), labelPaint);
if (i < columns)
{
canvas.DrawLine(new SKPoint(gridSize.XMin + (i * (gridSize.XSize / columns)), gridSize.YMin), new SKPoint(gridSize.XMin + (i * (gridSize.XSize / columns)), gridSize.YMax), DefaultDrawing);
}
}
canvas.DrawLine(new SKPoint(gridSize.XMax, gridSize.YMin), new SKPoint(gridSize.XMax, gridSize.YMax), DefaultDrawing);
// draw rows
for (int i = 0; i <= rows; i++)
{
var leftText = labelPaint;
leftText.TextAlign = SKTextAlign.Right;
canvas.DrawText($"{yAxis[i]}", new SKPoint(padding.Left - 5, padding.Top + gridSize.YSize - (gridSize.YSize / rows) * i + labelPaint.TextSize / 2), labelPaint);
if (secondYAxis != null)
{
canvas.DrawText($"{secondYAxis[i]}", new SKPoint(gridSize.XMax + 15, padding.Top + gridSize.YSize - (gridSize.YSize / rows) * i + labelPaint.TextSize / 2), labelPaint);
}
if (i < rows)
{
canvas.DrawLine(new SKPoint(gridSize.XMin, padding.Top + gridSize.YSize - (gridSize.YSize / rows) * i), new SKPoint(gridSize.XMax, padding.Top + gridSize.YSize - (gridSize.YSize / rows) * i), DefaultDrawing);
}
}
canvas.DrawLine(new SKPoint(gridSize.XMin, gridSize.YMax), new SKPoint(gridSize.XMax, gridSize.YMax), DefaultDrawing);
// Draw title
canvas.DrawText(title, new SKPoint(padding.Left, padding.Top / 2), TitleTextPaint);
}
public static List <SKPoint> GetPoints(Dictionary <DateTime, int> data, GridSize gridSize, bool yZeroIndexed = true, DateTime?minDate = null, DateTime?maxDate = null, bool overlapDays = false, int maxValue = -1)
{
// TODO implement overlap days
List <SKPoint> dataPoints = new List <SKPoint>();
// assume the dictionary is ordered
// todo ensure that just in case
DateTime firstDateTime = minDate ?? data.First().Key;
DateTime lastDateTime = maxDate ?? data.Last().Key;
long totalSec = (long)(lastDateTime - firstDateTime).TotalSeconds; // sec granularity
if (totalSec == 0)
{
return(dataPoints);
}
int minVal = int.MaxValue;
int maxVal = int.MinValue;
foreach (var item in data)
{
if (item.Value < minVal)
{
minVal = item.Value;
}
if (item.Value > maxVal)
{
maxVal = item.Value;
}
}
if (yZeroIndexed)
{
minVal = 0;
}
// set max value incase its specified
if (maxValue > 0)
{
maxVal = maxValue;
}
foreach (var item in data)
{
if (maxVal == 0)
{
break;
}
long currentTotalSec = (long)(item.Key - firstDateTime).TotalSeconds; // sec granularity
decimal xPercentage = currentTotalSec / (decimal)totalSec;
decimal yPercentage = (item.Value - minVal) / (decimal)(maxVal - minVal);
int xpos = (int)(gridSize.XSize * xPercentage) + gridSize.XMin;
int ypos = gridSize.YSize - (int)(gridSize.YSize * yPercentage) + gridSize.YMax;
dataPoints.Add(new SKPoint(xpos, ypos));
}
return(dataPoints);
}
