public override Carto.Graphics.Bitmap OnDrawPopup(PopupDrawInfo popupDrawInfo)
{
PopupStyle style = popupDrawInfo.Popup.Style;
// Calculate scaled dimensions
float DPToPX = popupDrawInfo.DPToPX;
float PXTODP = 1 / DPToPX;
if (style.ScaleWithDPI)
{
DPToPX = 1;
}
else
{
PXTODP = 1;
}
float screenWidth = popupDrawInfo.ScreenBounds.GetWidth() * PXTODP;
float screenHeight = popupDrawInfo.ScreenBounds.GetHeight() * PXTODP;
// Update sizes based on scale (uses extension method, cf. Shared/Extensions
int fontSize = FontSize.Update(DPToPX);
int triangleWidth = TriangleSize.Update(DPToPX);
int triangleHeight = TriangleSize.Update(DPToPX);
int strokeWidth = StrokeWidth.Update(DPToPX);
int screenPadding = ScreenPadding.Update(DPToPX);
// Set font
var font = Android.Graphics.Typeface.Create("HelveticaNeue-Light", Android.Graphics.TypefaceStyle.Normal);
// Calculate the maximum popup size, adjust with dpi
int maxPopupWidth = (int)(Math.Min(screenWidth, screenHeight));
float halfStrokeWidth = strokeWidth * 0.5f;
int maxTextWidth = maxPopupWidth - (2 * screenPadding + strokeWidth);
// Measure text
TextPaint textPaint = new TextPaint { Color = TextColor, TextSize = fontSize };
textPaint.SetTypeface(font);
var textLayout = new StaticLayout(text, textPaint, maxTextWidth, Layout.Alignment.AlignNormal, 1, 0, false);
int textX = (int)Math.Min(textPaint.MeasureText(text), textLayout.Width);
int textY = textLayout.Height;
int popupWidth = textX + (2 * PopupPadding + strokeWidth + triangleWidth);
int popupHeight = textY + (2 * PopupPadding + strokeWidth);
var bitmap = Android.Graphics.Bitmap.CreateBitmap(popupWidth, popupHeight, Android.Graphics.Bitmap.Config.Argb8888);
var canvas = new Android.Graphics.Canvas(bitmap);
var trianglePath = new Android.Graphics.Path();
trianglePath.MoveTo(triangleWidth, 0);
trianglePath.LineTo(halfStrokeWidth, triangleHeight * 0.5f);
trianglePath.LineTo(triangleWidth, triangleHeight);
trianglePath.Close();
int triangleOffsetX = 0;
int triangleOffsetY = (popupHeight - triangleHeight) / 2;
// Create paint object
var paint = new Android.Graphics.Paint();
paint.AntiAlias = true;
paint.SetStyle(Android.Graphics.Paint.Style.Stroke);
paint.StrokeWidth = strokeWidth;
paint.Color = StrokeColor;
// Stroke background
var background = new Android.Graphics.RectF();
background.Left = triangleWidth;
background.Top = halfStrokeWidth;
background.Right = popupWidth - strokeWidth;
background.Bottom = popupHeight - strokeWidth;
canvas.DrawRect(background, paint);
// Stroke triangle
canvas.Save();
canvas.Translate(triangleOffsetX, triangleOffsetY);
canvas.DrawPath(trianglePath, paint);
canvas.Restore();
// Fill background
paint.SetStyle(Android.Graphics.Paint.Style.Fill);
paint.Color = BackgroundColor;
canvas.DrawRect(background, paint);
// Fill triangle
canvas.Save();
canvas.Translate(triangleOffsetX, triangleOffsetY);
canvas.DrawPath(trianglePath, paint);
canvas.Restore();
if (textLayout != null)
{
// Draw text
canvas.Save();
canvas.Translate(halfStrokeWidth + triangleWidth + PopupPadding, halfStrokeWidth + PopupPadding);
textLayout.Draw(canvas);
canvas.Restore();
}
return BitmapUtils.CreateBitmapFromAndroidBitmap(bitmap);
}
public static void SmoothedPathWithGranularity(List <NativePoint> currentPoints, int granularity, out NativePath smoothedPath, out List <NativePoint> smoothedPoints)
{
// not enough points to smooth effectively, so return the original path and points.
if (currentPoints.Count < 4)
{
smoothedPath = null;
smoothedPoints = null;
return;
}
// create a new bezier path to hold the smoothed path.
smoothedPath = new NativePath();
smoothedPoints = new List <NativePoint> ();
// duplicate the first and last points as control points.
currentPoints.Insert(0, currentPoints[0]);
currentPoints.Add(currentPoints[currentPoints.Count - 1]);
// add the first point
smoothedPath.MoveTo(currentPoints[0].X, currentPoints[0].Y);
smoothedPoints.Add(currentPoints[0]);
for (var index = 1; index < currentPoints.Count - 2; index++)
{
var p0 = currentPoints[index - 1];
var p1 = currentPoints[index];
var p2 = currentPoints[index + 1];
var p3 = currentPoints[index + 2];
// add n points starting at p1 + dx/dy up until p2 using Catmull-Rom splines
for (var i = 1; i < granularity; i++)
{
var t = (float)i * (1f / (float)granularity);
var tt = t * t;
var ttt = tt * t;
// intermediate point
var mid = new NativePoint
{
X = 0.5f * (2f * p1.X + (p2.X - p0.X) * t +
(2f * p0.X - 5f * p1.X + 4f * p2.X - p3.X) * tt +
(3f * p1.X - p0.X - 3f * p2.X + p3.X) * ttt),
Y = 0.5f * (2 * p1.Y + (p2.Y - p0.Y) * t +
(2 * p0.Y - 5 * p1.Y + 4 * p2.Y - p3.Y) * tt +
(3 * p1.Y - p0.Y - 3 * p2.Y + p3.Y) * ttt)
};
smoothedPath.LineTo(mid.X, mid.Y);
smoothedPoints.Add(mid);
}
// add p2
smoothedPath.LineTo(p2.X, p2.Y);
smoothedPoints.Add(p2);
}
// add the last point
var last = currentPoints[currentPoints.Count - 1];
smoothedPath.LineTo(last.X, last.Y);
smoothedPoints.Add(last);
}
public override Carto.Graphics.Bitmap OnDrawPopup(PopupDrawInfo popupDrawInfo)
{
PopupStyle style = popupDrawInfo.Popup.Style;
// Calculate scaled dimensions
float DPToPX = popupDrawInfo.DPToPX;
float PXTODP = 1 / DPToPX;
if (style.ScaleWithDPI)
{
DPToPX = 1;
}
else
{
PXTODP = 1;
}
float screenWidth = popupDrawInfo.ScreenBounds.GetWidth() * PXTODP;
float screenHeight = popupDrawInfo.ScreenBounds.GetHeight() * PXTODP;
// Update sizes based on scale (uses extension method, cf. Shared/Extensions
int fontSize = FontSize.Update(DPToPX);
int triangleWidth = TriangleSize.Update(DPToPX);
int triangleHeight = TriangleSize.Update(DPToPX);
int strokeWidth = StrokeWidth.Update(DPToPX);
int screenPadding = ScreenPadding.Update(DPToPX);
// Set font
var font = Android.Graphics.Typeface.Create("HelveticaNeue-Light", Android.Graphics.TypefaceStyle.Normal);
// Calculate the maximum popup size, adjust with dpi
int maxPopupWidth = (int)(Math.Min(screenWidth, screenHeight));
float halfStrokeWidth = strokeWidth * 0.5f;
int maxTextWidth = maxPopupWidth - (2 * screenPadding + strokeWidth);
// Measure text
TextPaint textPaint = new TextPaint {
Color = TextColor, TextSize = fontSize
};
textPaint.SetTypeface(font);
var textLayout = new StaticLayout(text, textPaint, maxTextWidth, Layout.Alignment.AlignNormal, 1, 0, false);
int textX = (int)Math.Min(textPaint.MeasureText(text), textLayout.Width);
int textY = textLayout.Height;
int popupWidth = textX + (2 * PopupPadding + strokeWidth + triangleWidth);
int popupHeight = textY + (2 * PopupPadding + strokeWidth);
var bitmap = Android.Graphics.Bitmap.CreateBitmap(popupWidth, popupHeight, Android.Graphics.Bitmap.Config.Argb8888);
var canvas = new Android.Graphics.Canvas(bitmap);
var trianglePath = new Android.Graphics.Path();
trianglePath.MoveTo(triangleWidth, 0);
trianglePath.LineTo(halfStrokeWidth, triangleHeight * 0.5f);
trianglePath.LineTo(triangleWidth, triangleHeight);
trianglePath.Close();
int triangleOffsetX = 0;
int triangleOffsetY = (popupHeight - triangleHeight) / 2;
// Create paint object
var paint = new Android.Graphics.Paint();
paint.AntiAlias = true;
paint.SetStyle(Android.Graphics.Paint.Style.Stroke);
paint.StrokeWidth = strokeWidth;
paint.Color = StrokeColor;
// Stroke background
var background = new Android.Graphics.RectF();
background.Left = triangleWidth;
background.Top = halfStrokeWidth;
background.Right = popupWidth - strokeWidth;
background.Bottom = popupHeight - strokeWidth;
canvas.DrawRect(background, paint);
// Stroke triangle
canvas.Save();
canvas.Translate(triangleOffsetX, triangleOffsetY);
canvas.DrawPath(trianglePath, paint);
canvas.Restore();
// Fill background
paint.SetStyle(Android.Graphics.Paint.Style.Fill);
paint.Color = BackgroundColor;
canvas.DrawRect(background, paint);
// Fill triangle
canvas.Save();
canvas.Translate(triangleOffsetX, triangleOffsetY);
canvas.DrawPath(trianglePath, paint);
canvas.Restore();
if (textLayout != null)
{
// Draw text
canvas.Save();
canvas.Translate(halfStrokeWidth + triangleWidth + PopupPadding, halfStrokeWidth + PopupPadding);
textLayout.Draw(canvas);
canvas.Restore();
}
return(BitmapUtils.CreateBitmapFromAndroidBitmap(bitmap));
}
public void FillPolygon(Brush brush, Point[] points)
{
APaint.Color = brush.Color.AColor();
APaint.Flags = (Android.Graphics.PaintFlags)0;
APaint.Flags = Flags;
APaint.SetStyle(Android.Graphics.Paint.Style.Fill);
APaint.StrokeWidth = LineWidth;
var p = new Android.Graphics.Path();
p.MoveTo(points[0].X, points[0].Y);
foreach(var pt in points)
p.LineTo(pt.X, pt.Y);
ACanvas.DrawPath(p, APaint);
p.Dispose();
}
public void UpdateData(APath path)
{
UpdateShape(path);
}
/// <summary>
/// Obtain a smoothed path with the specified granularity from the current path using Catmull-Rom spline.
/// Also outputs a List of the points corresponding to the smoothed path.
/// </summary>
/// <remarks>
/// Implemented using a modified version of the code in the solution at
/// http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed
/// </remarks>
public static InkStroke SmoothedPathWithGranularity(InkStroke currentPath, int granularity)
{
var currentPoints = currentPath.GetPoints().ToList();
// not enough points to smooth effectively, so return the original path and points.
if (currentPoints.Count < 4)
{
return(currentPath);
}
// create a new bezier path to hold the smoothed path.
var smoothedPath = new NativePath();
var smoothedPoints = new List <NativePoint> ();
// duplicate the first and last points as control points.
currentPoints.Insert(0, currentPoints[0]);
currentPoints.Add(currentPoints[currentPoints.Count - 1]);
// add the first point
smoothedPath.MoveTo(currentPoints[0].X, currentPoints[0].Y);
smoothedPoints.Add(currentPoints[0]);
for (var index = 1; index < currentPoints.Count - 2; index++)
{
var p0 = currentPoints[index - 1];
var p1 = currentPoints[index];
var p2 = currentPoints[index + 1];
var p3 = currentPoints[index + 2];
// add n points starting at p1 + dx/dy up until p2 using Catmull-Rom splines
for (var i = 1; i < granularity; i++)
{
var t = (float)i * (1f / (float)granularity);
var tt = t * t;
var ttt = tt * t;
// intermediate point
var mid = new NativePoint
{
X = 0.5f * (2f * p1.X + (p2.X - p0.X) * t +
(2f * p0.X - 5f * p1.X + 4f * p2.X - p3.X) * tt +
(3f * p1.X - p0.X - 3f * p2.X + p3.X) * ttt),
Y = 0.5f * (2 * p1.Y + (p2.Y - p0.Y) * t +
(2 * p0.Y - 5 * p1.Y + 4 * p2.Y - p3.Y) * tt +
(3 * p1.Y - p0.Y - 3 * p2.Y + p3.Y) * ttt)
};
smoothedPath.LineTo(mid.X, mid.Y);
smoothedPoints.Add(mid);
}
// add p2
smoothedPath.LineTo(p2.X, p2.Y);
smoothedPoints.Add(p2);
}
// add the last point
var last = currentPoints[currentPoints.Count - 1];
smoothedPath.LineTo(last.X, last.Y);
smoothedPoints.Add(last);
// create the new path with the old attributes
#if __ANDROID__ || __IOS__
return(new InkStroke(smoothedPath, smoothedPoints.ToList(), currentPath.Color, currentPath.Width));
#elif WINDOWS_PHONE
var da = currentPath.DrawingAttributes;
smoothedPath.DrawingAttributes = new DrawingAttributes
{
Color = da.Color,
OutlineColor = da.OutlineColor,
Width = da.Width,
Height = da.Height,
};
return(smoothedPath);
#elif WINDOWS_UWP
var da = currentPath.DrawingAttributes;
var builder = new InkStrokeBuilder();
builder.SetDefaultDrawingAttributes(new InkDrawingAttributes
{
Color = da.Color,
Size = da.Size
});
return(builder.CreateStroke(smoothedPath));
#endif
}
