Develop Reference

c# SharpDX ScaleEffect Interpolation question

i've been using this wonderful library for low impact screen recording software however im at a point where i need to use a DirectX Scale Effect to scale the image down with anisotropic filtering.
I can create the effect just fine and set up most of its parameters, however im not able to set the most important one for me scaleEffect.SetValue((int)ScaleProperties.InterpolationMode, (int)SharpDX.Direct2D1.ScaleInterpolationMode.Anisotropic);
As soon as the program runs it crashes at that line with an invalid parameter exception.
I've searched and couldnt find anything wrong with the code, but then again i have almost 0 experience with anything Direct2D.
Here is the full code for that specific effect for reference:
SharpDX.Direct2D1.Effect scaleEffect = new D2D.Effect(textureDc, D2D.Effect.Scale);
scaleEffect.Cached = true;
scaleEffect.SetInput(0, frameBitmap, false);
var centerPoint = new SharpDX.Vector2(0, 0);
var newSize = new SharpDX.Vector2(0.2f, 0.2f);
scaleEffect.SetValue((int)ScaleProperties.CenterPoint, centerPoint);
scaleEffect.SetValue((int)ScaleProperties.Scale, newSize);
//Crashes Here: scaleEffect.SetValue((int)ScaleProperties.InterpolationMode, (int)SharpDX.Direct2D1.ScaleInterpolationMode.Anisotropic);
Error Message: SharpDX.SharpDXException: 'HRESULT: [0x80070057], Module: [General], ApiCode: [E_INVALIDARG/Invalid Arguments], Message: The parameter is incorrect.'
textureDc.BeginDraw();
textureDc.DrawImage(scaleEffect, InterpolationMode.Anisotropic);
textureDc.EndDraw();
Thank you very much in advance for any help!
UPDATE:
As per #Simon Mourier comment, the solution to avoid this bug somewhere in the SharpDX API, is to use the SharpDX.Direct2D1.Effects.Scale instead.
This way, i can confirm the InterpolationMode does no longer crash and works as intended!
Here is the new, working code for anyone running into the same issue.
SharpDX.Direct2D1.Effects.Scale scaleClass = new D2D.Effects.Scale(textureDc);
scaleClass.SetInput(0, frameBitmap,false);
scaleClass.Cached = true;
var centerPoint = new SharpDX.Vector2(0, 0);
var newSize = new SharpDX.Vector2(0.2f, 0.2f);
scaleClass.CenterPoint = centerPoint;
scaleClass.ScaleAmount = newSize;
scaleClass.InterpolationMode = InterpolationMode.Anisotropic;
textureDc.BeginDraw();
textureDc.DrawImage(scaleClass);
textureDc.EndDraw();
PS: For anyone wondering about casting the value to uint instead using the first method, it returns the following error:
(Argument1 cannot convert from uint to int)
So it semms that there might be some underlying bug in this specific scenario.

One solution is to use the SharpDX.Direct2D1.Effects.Scale directly which is a wrapper over the Effect class and comes with an InterpolationMode property.

GoogleMap: Polyline doesn't draw all Options

On a GoogleMap I am drawing a polyline to show a route. The lat/long-data is requested via Google Directions API and I receive correct data, usually for two different cities, from which I extract the lat/long-values and add it to an Polyoptions-object, which is added to the Polyline of the Map. Whatever the route is long, how much positions/latLng are available, the route never has more than around 8 straight lines. I have read a lot of stuff, and I can be sure, that the route is created correctly, I can even delete one to create another one. I have also tried "geodesic()" with true an false. No change.
Can anybody tell how I can get out of this?
Some code snippet
polylineOptions = new PolylineOptions();
foreach (var position in routeCoordinates)
{
polylineOptions.Add(new LatLng(position.Latitude, position.Longitude));
}
gMap.AddPolyline(polylineOptions);
Added on Sept 09, 2016
I started by using the points for the legs-steps, lots of points but wrong route, so I finally used only the final overview for the route this way
if (createRouteStep == true && prop.Equals("overview_polyline"))
{
i++;
line = getPropAndValue(lines[i]);
prop = getProp(line);
propValue = getPropValue(line);
string point = propValue.Replace(com, space).Trim();//= "yhoyHg~ol#nvgBgbjAbcbByxlDr_iArqG";
startRS = new RouteStep();
startRS.RouteID = routeCounter;
startRS.StepPoints = point;
sql.insertRouteStep(startRS);
i++;
}
The code is stored in an sqlite database, from which is later retrieved and decoded. Decoding works correct, I have tried a sample (points-result in the comment above) from the mentioned Google-test-site for this purpose and the route was the same as on the site. The points from my own request for the route have the correct direction, but don't follow any road or reach the destination at all.

Windows Phone 8: Collision in rectangles

So im working on a windows phone app and i need a way to detect weather the user has dragged a rectangle into another. ive got al of the dragging and everything sorted but i cannot for the life of me figure out how to detct a collision, i looked a little into xna and managed to bodge the bellow together if anybody could help out it would be much appriciated.
double BoxLeft = characterMain.Margin.Left;
double BoxTop = characterMain.Margin.Top;
Rect r1 = new Rect(BoxLeft, BoxTop, 20, 20);
txtblck2.Text = r1.X.ToString() + r1.Y.ToString();
double badBoxLeft = BadGuy.Margin.Left;
double badBoxTop = BadGuy.Margin.Top;
Rect r2 = new Rect(badBoxLeft, badBoxTop,12, 100);
txtblck3.Text = r2.X.ToString() + r2.Y.ToString();
r1.Intersect(r2);
if (r1.IsEmpty)
{
MessageBox.Show("You Did it");
}

Collision with rectangles is pretty easy, I don't know if u have searched anything but this will help you out a little:
http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.rectangle.intersects.aspx
Also some tutorials you'll probably want to read:
http://jamessadlier.wordpress.com/tutorials/xna-4-0-collision-detection/
http://codeforcake.com/blog/?p=160
The basic collision works like this:
It basically does what it says.
if(r1.Intersects(r2))
{
//Collision happend
//Do something
}
Next time when you have a question be sure to check the internet real good, there are a lot of tutorials and good examples out there.
Good luck with your project!

CA overlay on UISegmentedControl is overwritten in iOS5

I have the following code, which in iOS 4 produces the look of a "disabled" UISegmentedControl. As the attentive reader will notice, I am developing in MonoTouch, thus the c# syntax.
private void MakeOverlayOnLastRatingSegment()
{
RemoveOverlayOnLastRatingSegment();
lastRatingDisabledLayer = new CALayer();
lastRatingDisabledLayer.Frame = new RectangleF(new PointF(0, 0), segmLastRating.Frame.Size);
lastRatingDisabledLayer.CornerRadius = 10.0f;
lastRatingDisabledLayer.BackgroundColor = UIColor.FromRGBA(0.5f, 0.5f, 0.5f, 0.2f).CGColor;
segmLastRating.Layer.AddSublayer(lastRatingDisabledLayer);
}
And the result is:
But on iOS5 the result is a bit different. The segment before the selected cell is written on top of my gray layer. It takes a bit close look - more evident on a real device instead of simulator. For some reason the screendump from the simulator is very light.
Has anyone else experienced this, and do somebody have a workaround?
Best regards
/Anders

Could you add your overlay layer to the layer of the segmented control’s superview? Or perhaps the segmented control’s layer’s superlayer?

Managed DirectX9 ColorKey

I've managed to load a texture with TextureLoader.LoadFromFile(), and provided it with Color.Black.ToArgb() for it's colorkey.
Unfortunately, when I render it, using Device.DrawUserPrimitives, I'm still seeing black.
Am I missing some code to enable the use of the ColorKey?
Needed to set some renderstate on the Device:
Device.RenderState.AlphaBlendEnable = true;
Device.RenderState.SourceBlend = Blend.SourceAlpha;
Device.RenderState.DestinationBlend = Blend.InvSourceAlpha;

I'm not certain which but I think you need to enable the render state(s) AlphaBlendEnable and/or AlphaTestEnable. You might also have to set the blend modes.

By the way, you're using Managed DirectX, which has long been discontinued. You should consider switching to XNA or SlimDX.