public VehicleMapMarker(NMAGeoCoordinates coordinates, string vehicleName) : base(coordinates)
{
VehicleImageContext imageContext = GenerateMarkerImageWithText(vehicleName);
Icon = NMAImage.ImageWithUIImage(imageContext.image);
// place the blue dot of the marker image on the correct location on the map
AnchorOffset = imageContext.anchorOffset;
}
private VehicleImageContext GenerateMarkerImageWithText(string vehicleName)
{
NSString markerText = new NSString(vehicleName);
UIStringAttributes attributes = new UIStringAttributes {
Font = UIFont.FromName("Arial", 16), ForegroundColor = UIColor.White
};
CGSize sizeOfMarkerText = markerText.GetSizeUsingAttributes(attributes);
NSAttributedString markerString = new NSAttributedString(vehicleName, attributes);
// Calculate element sizes depending on text and text attributes like font and font size
float labelHeight = (float)Math.Ceiling(sizeOfMarkerText.Height * 2.0);
float labelWidth = (float)Math.Ceiling(sizeOfMarkerText.Width);
float labelEndSize = labelHeight;
float gpsPointSize = 10.0f;
float distanceBetweenLabelAndPoint = 10;
CGSize imageSize = new CGSize(labelWidth + (labelEndSize), labelHeight + distanceBetweenLabelAndPoint + gpsPointSize);
UIGraphicsImageRenderer renderer = new UIGraphicsImageRenderer(imageSize);
UIImage image = renderer.CreateImage((context) =>
{
// Color Declarations
UIColor blueZodiacColor = new UIColor(15.0f / 255f, 42.0f / 255f, 72.0f / 255f, 1.0f);
// Draw label rectangle
nfloat rectX = labelEndSize / 2.0f;
nfloat rectY = 0;
nfloat rectWidth = labelWidth;
nfloat rectHeight = labelHeight;
CGRect rectangleSize = new CGRect(rectX, rectY, rectWidth, rectHeight);
UIBezierPath rectanglePath = UIBezierPath.FromRect(rectangleSize);
blueZodiacColor.SetFill();
rectanglePath.Fill();
// Draw text
nfloat textX = rectangleSize.Location.X;
nfloat textY = rectangleSize.Location.Y + (rectangleSize.Size.Height / 4.0f);
nfloat textWidth = labelWidth;
nfloat textHeight = labelHeight;
markerString.DrawString(new CGRect(textX, textY, textWidth, textHeight));
// Draw label end left
nfloat endLeftX = 0;
nfloat endLeftY = 0;
CGRect endcupLeftRect = new CGRect(endLeftX, endLeftY, labelEndSize, labelEndSize);
UIBezierPath endcupLeftPath = new UIBezierPath();
endcupLeftPath.AddArc(new CGPoint(endcupLeftRect.GetMidX(), endcupLeftRect.GetMidY()), endcupLeftRect.Size.Width / 2, (nfloat)(90.0d * Math.PI / 180.0d), (nfloat)(-90.0d * Math.PI / 180.0d), true);
endcupLeftPath.AddLineTo(new CGPoint(endcupLeftRect.GetMidX(), endcupLeftRect.GetMidY()));
endcupLeftPath.ClosePath();
blueZodiacColor.SetFill();
endcupLeftPath.Fill();
// Draw label end right
nfloat endRightX = rectangleSize.Size.Width;
nfloat endRightY = 0;
CGRect endcupRightRect = new CGRect(endRightX, endRightY, labelEndSize, labelEndSize);
UIBezierPath endcupRightPath = new UIBezierPath();
endcupRightPath.AddArc(new CGPoint(endcupRightRect.GetMidX(), endcupRightRect.GetMidY()), endcupRightRect.Size.Width / 2, (nfloat)(270d * Math.PI / 180d), (nfloat)(90d * Math.PI / 180d), true);
endcupRightPath.AddLineTo(new CGPoint(endcupRightRect.GetMidX(), endcupRightRect.GetMidY()));
endcupRightPath.ClosePath();
blueZodiacColor.SetFill();
endcupRightPath.Fill();
// Draw GPS point
nfloat pointX = (nfloat)((imageSize.Width / 2.0) - (gpsPointSize / 2.0));
nfloat pointY = labelHeight + distanceBetweenLabelAndPoint;
UIBezierPath gpsPointPath = UIBezierPath.FromOval(new CGRect(pointX, pointY, gpsPointSize, gpsPointSize));
blueZodiacColor.SetFill();
gpsPointPath.Fill();
});
// Create vehicle image context and set image
VehicleImageContext vehicleImageContext = new VehicleImageContext();
vehicleImageContext.image = image;
// Calculate anchor offset to place the image correctly on the map
vehicleImageContext.anchorOffset = new CGPoint(0.0, -((imageSize.Height / 2.0) - (gpsPointSize / 2.0)));
return(vehicleImageContext);
}