LightningChart Support Forums

Posted: **Wed Mar 26, 2014 11:14 am**

Hi,

May i know is there any functions for loading of image(e.g. .png) into a graph? Apart from loading image as the map background or as annotations, i could not find any sample that simply just loads image into a graph. I intend to move the image layer on top of ViewXY graph.

Any sample code will be much appreciated.

Thanks!

Posted: **Wed Mar 26, 2014 6:49 pm**

Hi,

Background bitmap can be loaded like this:

Code: Select all

chart.ViewXY.GraphBackground.Bitmap.Image = (Bitmap) Image.FromFile("c:\\temp\\bg.png");
chart.ViewXY.GraphBackground.Bitmap.Layout = BitmapFillLayout.Stretch; 
chart.ViewXY.GraphBackground.Style = RectFillStyle.Bitmap;

This image can't however be set on top of other elements. It is a background.

There's ways to show bitmap over other objects, for example displaying them in Annotation's bitmap fill.

Posted: **Thu Mar 27, 2014 3:37 am**

Hi Pasi,

Thanks for the reply. I have added the image i wanted as an Annotation but i am facing some issues:
1) How do i remove the background colour behind the image? The image is originally a .png file and the white area is transparent when i view it. Is there any settings that i could set to make it transparent? Update: i am able to remove the gradient background by "vector.Fill.GradientColor = Color.Empty;". Is this the correct way?
2) The original size of the image is 498 by 594 pixels. Current i am setting the SizeScreenCoords to the pixel size and if i set any smaller than the actual pixels of the image file, the image will be cropped. Anyway that i could resize the image by using the Annotations properties instead of changing the image size (using a graphic editor software)?
3) How do i remove the line for the annotation? I now "remove" it by setting the TargetAxisValues and LocationAxisValues to the same position.

Appended below is my codes, what else am i lacking to do the above?

Code: Select all

            MapCoordinate mp = new MapCoordinate(27, 0, 0, LatitudePostfix.S, 133, 0, 0, LongitudePostfix.E);
            AnnotationXY vector = new AnnotationXY();
            vector.MouseInteraction = true;
            vector.TextStyle.Visible = false;
            vector.BorderVisible = false;
            vector.Shadow.Visible = false;
            vector.LocationCoordinateSystem = CoordinateSystem.AxisValues;
            vector.Fill.Bitmap.Image = ChartTools.ImageFromResource("Resources.boeing.png", System.Reflection.Assembly.GetExecutingAssembly());
            vector.Fill.GradientColor = Color.Empty;
            vector.Fill.Style = RectFillStyle.Bitmap;
            vector.RotateAngle = 0;
            vector.Sizing = AnnotationXYSizing.ScreenCoordinates;
            vector.SizeScreenCoords.Height = 594;
            vector.SizeScreenCoords.Width = 498;

            vector.TargetAxisValues.X = mp.Longitude;
            vector.TargetAxisValues.Y = mp.Latitude;

            vector.LocationAxisValues.X = mp.Longitude;
            vector.LocationAxisValues.Y = mp.Latitude; 

            m_chart.ViewXY.Annotations.Add(vector);

Can i also check is any any in-built interpolation function for 2 points in LightningChart?

Thank You in advanced.

Posted: **Thu Mar 27, 2014 5:59 am**

Hello,

1) setting
vector.Fill.Color = Color.Empty;
vector.Fill.GradientColor = Color.Empty;
makes the background not visible. You could as well use Color.Transparent.
Also set Shadow.Visible = false.

2) Set vector.Fill.Bitmap.Layout = Stretch;

3) Set vector.Style = Rectangle.

For interpolating a point between two given points (if you are asking that) there's a couple ChartTools.SolvePointBetweenPoints methods.

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