public override void Draw(CGRect rect)
{
base.Draw(rect);
_highTemps = null;
_lowTemps = null;
_hourlyTemps = null;
if (Forecasts.Count == 0 || Hourly.Count == 0)
{
return;
}
graphRect = new CGRect(rect.X + padding, rect.Y + padding, rect.Width - (padding * 2), rect.Height - (padding * 2));
var days = Hourly.GroupBy(h => h.FCTTIME.mday).Select(g => g.First().FCTTIME.weekday_name_abbrev).ToList();
var dayCount = hourly ? days.Count : Forecasts.Count;
var xAxisScale = (graphRect.Width + padding / 2) / dayCount;
inset = xAxisScale / 2;
var highest = (nfloat)(hourly ? HourlyTemps.Max() : HighTemps.Max());
var lowest = (nfloat)(hourly ? HourlyTemps.Min() : LowTemps.Min());
scaleHigh = NMath.Round(highest, MidpointRounding.AwayFromZero);
scaleLow = lowest < 0 ? NMath.Round(lowest, MidpointRounding.AwayFromZero) : NMath.Round(lowest);
var rangePadding = Settings.UomTemperature.IsImperial() ? scalePadding : (scalePadding / 2);
scaleHigh += rangePadding;
scaleLow -= rangePadding;
scaleRange = scaleHigh - scaleLow;
var scaleIncrement = scaleRange / dividerCount;
scaleX = (graphRect.Width - inset) / (hourly ? HourlyTemps.Count : Forecasts.Count);
scaleY = graphRect.Height / dividerCount;
nfloat x, y;
using (CGContext ctx = UIGraphics.GetCurrentContext()) {
// Draw x and y axis
using (UIColor color = UIColor.White) {
color.SetStroke();
ctx.SetLineWidth(1);
using (CGPath p = new CGPath()) {
p.MoveToPoint(graphRect.GetMinX(), graphRect.GetMaxY());
p.AddLines(new [] {
new CGPoint(graphRect.GetMinX(), graphRect.GetMinY()),
new CGPoint(graphRect.GetMinX(), graphRect.GetMaxY()),
new CGPoint(graphRect.GetMaxX(), graphRect.GetMaxY())
});
ctx.AddPath(p);
ctx.DrawPath(CGPathDrawingMode.Stroke);
}
}
// Draw horizontal gridlines
using (UIColor color = UIColor.Black.ColorWithAlpha(0.08f)) {
for (int i = 1; i < dividerCount; i += 2)
{
y = (i + 1) * scaleY;
color.SetFill();
ctx.FillRect(new CGRect(graphRect.GetMinX(), graphRect.GetMaxY() - y, graphRect.Width, scaleY));
ctx.StrokePath();
}
}
drawLines();
// Draw y-axis labels
nfloat yStep = scaleLow;
ctx.SaveState();
ctx.TranslateCTM(0, rect.Height);
ctx.ScaleCTM(1, -1);
for (int i = 0; i <= dividerCount; i++)
{
y = padding + (i * scaleY);
var step = NMath.Round(yStep).ToString();
drawLabel(ctx, rect, y, padding - 6, UITextAlignment.Right, step, false, true);
yStep += scaleIncrement;
}
// Draw x-axis labels
for (int i = 0; i < dayCount; i++)
{
x = padding + (i * xAxisScale);
drawLabel(ctx, rect, padding - 6, x, UITextAlignment.Left, hourly ? days [i] : Forecasts [i]?.date?.weekday_short, false);
}
ctx.RestoreState();
}
}
public override void Draw(Canvas canvas)
{
base.Draw(canvas);
if (!scaled)
{
density = Resources.DisplayMetrics.Density;
padding *= density;
lineWidth *= density;
fontSize *= density;
scaled = true;
}
_highTemps = null;
_lowTemps = null;
_hourlyTemps = null;
if (Forecasts.Count == 0 || Hourly.Count == 0)
{
return;
}
graphRect = new RectF(padding, padding, canvas.Width - padding, canvas.Height - padding); // CGRect (rect.X + padding, rect.Y + padding, rect.Width - (padding * 2), rect.Height - (padding * 2));
System.Diagnostics.Debug.WriteLine($"lineWidth = {lineWidth}");
System.Diagnostics.Debug.WriteLine($"canvas.Width = {canvas.Width}");
System.Diagnostics.Debug.WriteLine($"canvas.Height = {canvas.Height}");
System.Diagnostics.Debug.WriteLine($"graphRect.Width() = {graphRect.Width ()}");
System.Diagnostics.Debug.WriteLine($"graphRect.Height() = {graphRect.Height ()}");
System.Diagnostics.Debug.WriteLine($"graphRect.Left = {graphRect.Left}");
System.Diagnostics.Debug.WriteLine($"graphRect.Top = {graphRect.Top}");
System.Diagnostics.Debug.WriteLine($"graphRect.Right = {graphRect.Right}");
System.Diagnostics.Debug.WriteLine($"graphRect.Bottom = {graphRect.Bottom}");
var days = Hourly.GroupBy(h => h.FCTTIME.mday).Select(g => g.First().FCTTIME.weekday_name_abbrev).ToList();
var dayCount = hourly ? days.Count : Forecasts.Count;
var xAxisScale = (graphRect.Width() + padding / 2) / dayCount;
inset = xAxisScale / 2;
var highest = (float)(hourly ? HourlyTemps.Max() : HighTemps.Max());
var lowest = (float)(hourly ? HourlyTemps.Min() : LowTemps.Min());
scaleHigh = (float)Math.Round(highest, MidpointRounding.AwayFromZero);
scaleLow = lowest < 0 ? (float)Math.Round(lowest, MidpointRounding.AwayFromZero) : (float)Math.Round(lowest);
var rangePadding = Settings.UomTemperature.IsImperial() ? scalePadding : (scalePadding / 2);
scaleHigh += rangePadding;
scaleLow -= rangePadding;
scaleRange = scaleHigh - scaleLow;
var scaleIncrement = scaleRange / dividerCount;
scaleX = (graphRect.Width() - inset) / (hourly ? HourlyTemps.Count : Forecasts.Count);
scaleY = graphRect.Height() / dividerCount;
float x, y;
var white = Color.White;
// Draw x and y axis
var paint = new Paint();
paint.Color = white;
paint.StrokeWidth = 1;
using (Path path = new Path()) {
path.MoveTo(graphRect.Left, graphRect.Top);
path.LineTo(graphRect.Left, graphRect.Bottom);
path.LineTo(graphRect.Right, graphRect.Bottom);
paint.SetStyle(Paint.Style.Stroke);
canvas.DrawPath(path, paint);
}
Color translucentBlack = Color.Argb(20, 0, 0, 0);
paint.Color = translucentBlack;
paint.SetStyle(Paint.Style.Fill);
// Draw horizontal gridlines
for (int i = 1; i < dividerCount; i += 2)
{
y = graphRect.Bottom - ((i + 1) * scaleY);
using (RectF grid = new RectF(padding, y, graphRect.Right, y + scaleY))
canvas.DrawRect(grid, paint);
}
drawLines(canvas, paint);
float labelPadding = 6 * density;
float yStep = scaleLow;
// Draw y-axis labels
for (int i = dividerCount; i >= 0; i--)
{
y = padding + (i * scaleY);
var step = Math.Round(yStep).ToString();
drawLabel(canvas, graphRect.Left - labelPadding, y, Paint.Align.Right, step, true);
yStep += scaleIncrement;
}
// Draw x-axis labels
for (int i = 0; i < dayCount; i++)
{
x = padding + (i * xAxisScale);
drawLabel(canvas, x, graphRect.Bottom + labelPadding, Paint.Align.Left, hourly ? days [i] : Forecasts [i]?.date?.weekday_short);
}
}
