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improve quality of sound wave by drawing intermediate values between points

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This commit is contained in:
Andrzej Rybczak
2009-09-01 09:28:53 +02:00
parent 1456e47a0b
commit 7401a39a25
1 changed files with 11 additions and 0 deletions
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11
src/visualizer.cpp
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@@ -118,6 +118,7 @@ void Visualizer::DrawSoundWave(int16_t *buf, ssize_t data)
const int samples_per_col = data/sizeof(int16_t)/COLS; const int samples_per_col = data/sizeof(int16_t)/COLS;
const int half_height = MainHeight/2; const int half_height = MainHeight/2;
*w << fmtAltCharset; *w << fmtAltCharset;
double prev_point_pos;
for (int i = 0; i < COLS; ++i) for (int i = 0; i < COLS; ++i)
{ {
double point_pos = 0; double point_pos = 0;
@@ -127,6 +128,16 @@ void Visualizer::DrawSoundWave(int16_t *buf, ssize_t data)
point_pos /= std::numeric_limits<int16_t>::max(); point_pos /= std::numeric_limits<int16_t>::max();
point_pos *= half_height; point_pos *= half_height;
*w << XY(i, half_height+point_pos) << '`'; *w << XY(i, half_height+point_pos) << '`';
if (i && abs(prev_point_pos-point_pos) > 2)
{
// if gap is too big. intermediate values are needed
// since without them all we see are blinking points
const int breakpoint = std::max(prev_point_pos, point_pos);
const int half = (prev_point_pos+point_pos)/2;
for (int k = std::min(prev_point_pos, point_pos)+1; k < breakpoint; k += 2)
*w << XY(i-(k < half), half_height+k) << '`';
}
prev_point_pos = point_pos;
} }
*w << fmtAltCharsetEnd; *w << fmtAltCharsetEnd;
} }