trackball | 易学教程

Disable trackball click in Android

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问题 I've run into some difficulties with implementing a custom progress dialog. Even though an overlay intercepts touch events the user can still operate the trackball and click elements that are supposed to be disabled. Is there any way around this? Edit: here's a solution //===================================================================================== protected void showProgressIndicator() { progressIndicator_.show(); } //==================================================================

Is there a plugin to add rotation to three.js self-learning project?

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问题 I'm starting to play with three.js and was wondering if there's a simple plugin to add the trackball functionality so I can see how the changes I'm making in code is affecting the "underside" of the simple object. I tried to follow: http://mrdoob.github.com/three.js/examples/misc_controls_trackball.html But I'm getting a lot of EventDispatcher errors. By try, I mean I've: added "TrackballControls.js" added "Detector.js" added this bit of code: if ( ! Detector.webgl ) Detector

Tracking white ball in white background (Python/OpenCV)

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问题 i'm using OpenCV in Python 3 to detect a white/black ball on a white field and give it's exact (x,y,radius) and color. I use the function cv2.Canny() and cv2.findContours() to find it but the problem is cv2.Canny() dont's always detect the complete shape of the circle (most of time only 3/4 of the circle). So when i use cv2.findContours() it don't detect it as a Contour. Please see : and This is the most important code: gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) blurred = cv2.GaussianBlur

Trackball controls doesn't work in new build of three.js

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问题 I'm trying to make a simulation consisting of many lines. Up until now I had Three.js v45 and Trackball Controls and it worked fine. I then tried to implement my lines in a buffer geometry (as in this example: http://fzwoch.project-sheol.org/three.js/examples/webgl_buffergeometry_lines.html) but for that I needed to update to the newer Three.js build. And Trackball Controls doesn't work anymore! Am I missing something? How can I get both to work? Thank you, Kasia 回答1: First have you noticed

JavaFX 3D Rotation around Scene Fixed Axes

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问题 Creating a Virtual Trackball Using JavaFX I want to create a virtual trackball device where X and Y mouse drag events rotate my virtual trackball in an intuitive way. Intuitive (at least to me) means, with my scene axes being: X increasing left to right Y increasing top to bottom Z increasing perpendicular to the screen towards the viewer I want vertical mouse drag events to cause the trackball to roll around the scene X axis, and mouse horizontal drag events to cause the trackball to rotate

OnKeyListener or OnKeydown not work if children views take the focus

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问题 I want to listen to a ScrollView to see if it is scrolling. I used OnTouchListener, it works well. But when I want to add compatibility to trackball using OnKeyListener or overriding the OnKeydown method, it can't work. Seems like the child buttons taking the focus causes the problem. Any solution or workaround to resolve this problem? Any help is appreciated. Here are some demo codes to reproduce my problem: public class TestActivity extends Activity { @Override public void onCreate(Bundle

OnKeyListener or OnKeydown not work if children views take the focus

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I want to listen to a ScrollView to see if it is scrolling. I used OnTouchListener, it works well. But when I want to add compatibility to trackball using OnKeyListener or overriding the OnKeydown method, it can't work. Seems like the child buttons taking the focus causes the problem. Any solution or workaround to resolve this problem? Any help is appreciated. Here are some demo codes to reproduce my problem: public class TestActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ScrollView

Change “Pulse notification light” / trackball light setting on Android (Nexus One only?)

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问题 On the Nexus One (at least in 2.1-update1, and I think in 2.1), there is a setting under Sound & Display: "Pulse notification light". This doesn't seem to be present on the "2.1 with Google APIs" emulator image. I've not yet checked any other devices. Pulse notification light: Pulse trackball light repeatedly for new notifications http://chris.boyle.name/images/20100206-pulse-trackball.png I want to set this programmatically without user interaction, in order to make a Locale plugin, so the

Disable trackball click in Android

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I've run into some difficulties with implementing a custom progress dialog. Even though an overlay intercepts touch events the user can still operate the trackball and click elements that are supposed to be disabled. Is there any way around this? Edit: here's a solution //===================================================================================== protected void showProgressIndicator() { progressIndicator_.show(); } //===================================================================================== @Override public boolean onTrackballEvent(MotionEvent event) { return