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visualizer: slightly modify DrawSoundEllipseStereo

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This commit is contained in:
Andrzej Rybczak
2014-10-26 23:32:59 +01:00
parent f420843cdf
commit c45bd4b43e
1 changed files with 8 additions and 7 deletions
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15
src/visualizer.cpp
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@@ -354,24 +354,25 @@ void Visualizer::DrawSoundEllipse(int16_t *buf, ssize_t samples, size_t, size_t
// Since every font/terminal is different, the visualizer is never a perfect circle. This
// visualizer assume the font height is twice the length of the font's width. If the font
// is skinner or wider than this, instead of a circle it will be an ellipse.
void Visualizer::DrawSoundEllipseStereo(int16_t *buf_left, int16_t *buf_right, ssize_t samples, size_t height)
void Visualizer::DrawSoundEllipseStereo(int16_t *buf_left, int16_t *buf_right, ssize_t samples, size_t half_height)
{
const long width = w.getWidth()/2;
const size_t half_width = w.getWidth()/2;
// Makes the radius of the color circle proportional to max of height or width.
// Divide by colors size so that there are multiple color rings instead of just a few.
const long scaledRadius = std::max(pow(width,2), pow(height,2))/pow(Config.visualizer_colors.size(),2);
const int32_t radius = std::max(half_width, half_height)/Config.visualizer_colors.size();
int32_t x, y;
for (ssize_t i = 0; i < samples; ++i)
{
long x = width + ((double) buf_left[i] * 2 * ((double)width / 65536.0));
long y = height + ((double) buf_right[i] * 2 * ((double)height / 65536.0));
x = double(buf_left[i]) * half_width / 32768.0;
y = double(buf_right[i]) * half_height / 32768.0;
// The arguments to the toColor function roughly follow a circle equation where
// the center is not centered around (0,0). For example (x - w)^2 + (y-h)+2 = r^2
// centers the circle around the point (w,h). Because fonts are not all the same
// size, this will not always generate a perfect circle.
w << toColor(pow((x - width)*1, 2) + pow((y - ((long)height)) * 2,2), scaledRadius)
<< NC::XY(x, y)
w << toColor(sqrt(x*x + 4*y*y), radius)
<< NC::XY(half_width + x, half_height + y)
<< Config.visualizer_chars[1]
<< NC::Color::End;
}