The Android documentation used to incorrectly state that 160 dp always equals 1 inch regardless of screen density. This was reported as a bug which was accepted and the documentation updated. From the updated documentation: 160 dp will NOT always equal 1 inch, it will vary with different screen sizes and densities. On a screen … Read more
find the coin (green bounding box rectangle) either manually or by some search for specific color,pattern,hough transform,segmentation… This will limit the area to search for next steps find the boundary (distinct red edge in color intensity) so create a list of points that are the coin boundary (be careful with shadows) just scan for high … Read more
You cannot use the width/height/getMeasuredWidth/getMeasuredHeight on a View before the system renders it (typically from onCreate/onResume). Simple solution for this is to post a Runnable to the layout. The runnable will be executed after the View has been laid out. BoxesLayout = (RelativeLayout) findViewById(R.id.BoxesLinearLayout); BoxesLayout.post(new Runnable() { @Override public void run() { int w = … Read more
You can use em, %, px. But in combination with media-queries See this Link to learn about media-queries. Also, CSS3 have some new values for sizing things relative to the current viewport size: vw, vh, and vmin. See link about that.
Use perf: perf stat ./yourapp See the kernel wiki perf tutorial for details. This uses the hardware performance counters of your CPU, so the overhead is very small. Example from the wiki: perf stat -B dd if=/dev/zero of=/dev/null count=1000000 Performance counter stats for ‘dd if=/dev/zero of=/dev/null count=1000000’: 5,099 cache-misses # 0.005 M/sec (scaled from 66.58%) … Read more
Similar to this question which asks about points instead of centimeters. There are 72 points per inch and there are 2.54 centimeters per inch, so just substitute 2.54 for 72 in the answer to that question. I’ll quote and correct my answer here: There are 2.54 centimeters per inch; if it is sufficient to assume … Read more
From WindowsClient.net: GDI+ adds a small amount (1/6 em) to each end of every string displayed. This 1/6 em allows for glyphs with overhanging ends (such as italic ‘f‘), and also gives GDI+ a small amount of leeway to help with grid fitting expansion. The default action of DrawString will work against you in displaying … Read more
You have (at least) two solutions : The quite “naïve” one is using microtime(true) tobefore and after a portion of code, to get how much time has passed during its execution ; other answers said that and gave examples already, so I won”t say much more. This is a nice solution if you want to … Read more
//***C++11 Style:*** #include <chrono> std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now(); std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now(); std::cout << “Time difference = ” << std::chrono::duration_cast<std::chrono::microseconds>(end – begin).count() << “[µs]” << std::endl; std::cout << “Time difference = ” << std::chrono::duration_cast<std::chrono::nanoseconds> (end – begin).count() << “[ns]” << std::endl;