Draw FFT graph on window control using window handle.
__stdcall __declspec(dllimport) int zplay_DrawFFTGraphOnHWND(ZPLAY_HANDLE handle, void* hwnd, int nX, int nY, int nWidth, int nHeight);
Parameters |
Description |
ZPLAY_HANDLE handle |
ZPLAY handle. Get this handle with zplay_CreateZPlay. |
void* hwnd |
Window handle, identifies the window. |
int nX |
Specifies the logical x-coordinate of the upper-left corner of the destination rectangle. |
int nY |
Specifies the logical y-coordinate of the upper-left corner of the destination rectangle. |
int nWidth |
Specifies the logical width of the source and destination rectangles. Caution: There is minimal width value. See TFFTGraphSize. |
int nHeight |
Specifies the logical height of the source and the destination rectangles. Caution: There is minimal height value. See TFFTGraphSize. |
Return Values |
Description |
1 |
All OK. |
0 |
Error. To get error message read here. |
Function will use window handle to get device context of specified window and then draw graph on this device context. Drawing data are fully synchronized with audio data from wave buffer. All you need is to call this function when you need to refresh displayed graph data. To get smooth animation effect, call this function 10 - 20 times per second. You can create another thread to do this job.
Note: This function must perform FFT analysis on audio data and this takes some time if you set too big gpFFTPoints value. If you set fast refresh interval, this can take too much proccessor time. Be careful.
Draw FFT graph on specified window 20 times per second.
while(fDrawind) { // draw graph on window control, starting in upper left corner, size of graph is 400 x 200 pixel instance->DrawFFTGraphOnHWND(myWndHandle, 0, 0, 400, 200); // wait 50 ms Sleep(50); }
while(fDrawing) { // draw graph on window control, starting in upper left corner, size of graph is 400 x 200 pixel zplay_DrawFFTGraphOnHWND(instance, myWndHandle, 0, 0, 400, 200); // wait 50 ms Sleep(50); }
Copyright (c) 2010. Zoran Cindori - All rights reserved.
Web: http://libzplay.sourceforge.net/ Email: zcindori@inet.hr |