I'm new to GDI+ programming and am looking for some advice.
I am loading an image from a file and displaying it using the following functions (some pseudo code included):
Gdiplus::Image *i = new Gdiplus::Image(file, other parameters ... );
Gdiplus::DrawImage(i, other parameters ... );
I would like to associate a tooltip with the image. Is there any way that I can automatically set/attach a tooltip to the Gdiplus::Image objact (or any other Gdiplus control that I wish to draw for that matter)?
If not, how can such functionality be achieved? I have looked at CToolTipCtrl in WTL but don't know how to attach it to the Gdiplus::Image.
Thanks in advance.
After investigating this more, I've realised that this is not possible, so to speak. You must use GDI+ to draw your own tool tip my monitoring mouse events to see when it is hovering over something, then using the device context to do the drawing withing the mouse hover event handler.
Related
I am doing an application in which a form data is filled by user.All are working fine.But I want the animation effects in Xamarin forms for android and iOS as shown below.Anyone please give me a suggestion to move forward with animation effects in my app.
Thanks in advance.
There are many methods for animation on Forms.
like
Label lb = new Label();
lb.ScaleTo(...)
lb.FadeTo(...)
lb.TranslateTo(...)
and You can also adjust it's position by using lb.TranslateX or Y
You can use it and mix it when it's needed.
Then, You will achieve what you want.
1、I want to create a circle and set an image that customized to fill the circle，use this as a marker on the map, not only could change the image but also the color of circle anytime，what can I do to implements this function? Please look at the picture below!
2、Like your CityMaps app show，when I enlarge the map, some business icon that hide are show on the map，which are hide again while shrink the map, How to achieve this effect？
3、After I initialization the Object Marker and called the method marker.setFadeTime(3000)，the software give my tips the method is no exist and I see the class Marker.java but really not find the method，Why is it so？
4、I want to add some stars beside the marker like this:
What can I do to add the stars？the label only can set the text beside the marker.
5、I want to load your maps at the fragment，not the activity that extends FragmentActivity，I found the SupportCitymapsMapFragment is no use，What I can do to complete this requirement?
6、In your apps，it is locate that place after input New York in the search box，What can i do to complete this function whatever i input？
7、During I develop the apps about the Citymaps，I found a serious problem so that your apps had happend too. When I run the apps， the program force flash back all of a sudden and I run your apps Citymaps at this time，the problems are same of the front，I found some error in logical view that is follows：15327-15374/com.map.maplbs A/libc﹕ Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 15374 (Thread-1819).
To solve the problem，I must restart my device. Why is it so？
I am a developer on the Citymaps SDK, I will do my best to answer your questions.
1) I recommend using the Android Canvas API to construct the images, and then use a Marker to display it on the map. See the documentation for details: http://developer.citymaps.com/markers
2) This is built into the Citymaps BusinessLayer. This functionality is not exposed through an API. If you wish to use the Citymaps BusinessLayer, you should create a CitymapsMapView or CitymapsMapFragment/SupportCitymapsMapFragment and it will automatically be added to your map.
3) At this time, there appears to be a known issue with the fadeTime API. Thank you for bringing this to our attention. We will fix it in an upcoming release. For now, you can animate the alpha property of the Marker.
4) Once again, the functionality of the BusinessLayer is not directly exposed. If you wish to create similar markers, I recommend you construct the image using Android's Canvas and then adding it as a Marker to the map.
5) If you wish to load the map inside of a fragment, you can accomplish this using child fragments (check Android documentation for more details). You can also accomplish this by instantiating CitymapsMapView or MapView directly and adding it to your view hierarchy either in XML or in code. However if you do this, remember to call the lifecycle methods on your map instance, or else the map will not behave properly.
6) If you wish to have a search in your app, it is up to you to implement this feature. We do not currently provide a search API out of the box.
7) Thank you for the bug report. We will investigate this issue and fix it in a future release.
If you have any more questions, feel free to ask, and thank you for using the Citymaps SDK.
I want to have a custom MKOverlay that's a circle anchored to the user location annotation that the user can resize by pinching. I was able to successfully achieve this using MKOverlayPathRenderer and a custom MKOverlay object by overriding the createPath method and making an arc. The resizing and moving of the overlay was handled by using KVO on the radius and coordinate properties of my overlay. However the resizing was incredibly choppy and the boundingMapRect wasn't correctly calculated.
I've also tried using an image and instead of subclassing MKOverlayPathRenderer just MKOverlayRenderer, overriding - (void)drawMapRect:(MKMapRect)mapRect zoomScale:(MKZoomScale)zoomScale inContext:(CGContextRef)context but when I resize my CPU percentage jumps to 160% usage (not great yeah?) and the boundingRect is again being drawn incorrectly.
I really think the way to do it is with MKOverlayPathRenderer and maybe having an atomic counter of some kind so that a redraw only gets called say every 5 or 10 times the pinch gesture is triggered.
Does anyone have any suggestions? I've also considered but haven't tried making a UIView and adding it as a subview to the map view and putting the pinch gesture on that but that seems hacky and dirty.
When you computed new boundingMapRect on the Overlay, you must invoke invalidatePath on your Renderer. After that, system will invoke createPath for you when appropriate.
I've painted several rectangles on a panel, using 'CreateGraphics()'. Though they always disappeared after minimizing and restoring the window I used the paint-event in order to restore them and everything works fine, always using 'CreateGraphics().
Sometimes ago Mr. Hans Passant gave me the advice to SUBSTITUTE 'CreateGraphics()' with the paint event of the panel. It seems to me, that the 'paint' event is also used for creating, and not only 4 restoring.
Visual C++ DrawRectangle filled:
... In general, do not use CreateGraphics(), whatever you draw won't survive. Minimize and restore your window for example. Use the panel's Paint event instead. – Hans Passant Jul 3 at 12:47
I tried so, but I didn't succeed. I always needed 'CreateGraphics' in order to initialize a pointer to the class 'Graphics' and to use the method 'drawRectangle':
System::Drawing::Graphics ^drawPointer = CreateGraphics();
After that You create the rectangle with
drawPointer->drawRectangle(...);
But going into the 'paint-event' of the panel, how do I reach the method 'drawRectangle' without using 'CreateGraphics()'? Or did I get the advice in the wrong way?
I don't know if I get you right, but usually you get a painting capability like this:
System::Void Paint(System::Object^ sender, System::Windows::Forms::PaintEventArgs^ e) {
System::Drawing::Graphics^ g = e->Graphics;
g->DrawRectangle(...);
}
How can I obtain the Window Rect of a CDialog which is based on a dialog template. The dialog is not and can not be visible
It might be tricky with CDialog, because if you dont show the CDialog, the window handle is not created and you cant call GetClientRect.
Might i suggest calling CreateDialogIndirect instead to create the dialog, then you can get the client rect. You dont need to show the dialog. I think as long as the window handle is created, the GetClientRect should work. I am not an expert though and its been many years since i have written MFC code.
Well...
In Windows API-land, you could load the resource yourself (FindResourceEx, LoadResource), understand the binary structure of the dialog template resource (some clues at http://blogs.msdn.com/oldnewthing/archive/2004/06/22/162360.aspx), convert the size of the dialog in the dialog template from dialog units to pixels (check out http://msdn.microsoft.com/en-us/library/ms645475(VS.85).aspx).
I'd be curious why you'd want to do this, though.