I am writing a waveform editor but am stuck at what seems a simple problem as for efficiently drawing even very long recordings. It is my understanding/intuition that for every column one pixel wide in the display I must compute the min and the max amplitude of the corresponding block of samples (and then draw a vertical line between them) But this translates to having to scan the whole recording, which can even be many MB long, at every zoom in or out operation, which is surely not very efficient, and can even lead to hiccups on slow machines or with very long recordings. I am sure that some trick exists and is commonly used to speed up this task but I have no idea how to do it... can you point me on some link explaining the tricks if any ? Or explain the tricks directly ? I could not find any...
Related Questions in DRAWING
- Initialize matrix
- Delete a column and a row in a square matrix in C
- multiply each columns of a matrix by a vector
- How can I extract the bounds of a bitmap in a canvas from the values in the transformation matrix?
- Find saddle points in Matlab
- Adding appending numpy arrays
- Python: Array subtract Matrix - TypeError: unsupported operand type(s) for -: 'int' and 'list'
- List of coordinates to matrix of distances
- Is there a way to make array entries complex variables in NumPy?
- Determining regression coefficients for data - MATLAB
Related Questions in AUDIOWAVEFORM
- Initialize matrix
- Delete a column and a row in a square matrix in C
- multiply each columns of a matrix by a vector
- How can I extract the bounds of a bitmap in a canvas from the values in the transformation matrix?
- Find saddle points in Matlab
- Adding appending numpy arrays
- Python: Array subtract Matrix - TypeError: unsupported operand type(s) for -: 'int' and 'list'
- List of coordinates to matrix of distances
- Is there a way to make array entries complex variables in NumPy?
- Determining regression coefficients for data - MATLAB
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
Popular Tags
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)