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Use fixed number of bands

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This commit is contained in:
Alexander Kojevnikov 2010-05-08 15:40:50 +10:00
parent ed9ae07778
commit 12dc19625c
1 changed files with 15 additions and 8 deletions
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23
src/spek-spectrogram.vala
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@ -7,9 +7,10 @@ namespace Spek {
private Source source;
private string file_name;
private const int THRESHOLD = -92;
private const int THRESHOLD = -100;
private ImageSurface image;
private const int PADDING = 60;
public Spectrogram () {
show_all ();
@ -21,18 +22,23 @@ namespace Spek {
}
private void start () {
this.image = new ImageSurface (Format.RGB24, allocation.width, allocation.height);
// The number of bands is the number of pixels available for the image.
// The number of samples is fixed, FFT results are very different for
// different values but we need some consistency.
this.image = new ImageSurface (Format.RGB24, allocation.width - 2 * PADDING, 1024);
if (this.source != null) {
this.source.stop ();
}
this.source = new Source (
file_name, allocation.height, allocation.width,
file_name, image.get_height (), image.get_width (),
THRESHOLD, source_callback);
queue_draw ();
}
private override void size_allocate (Gdk.Rectangle allocation) {
base.size_allocate (allocation);
if (file_name != null) {
start ();
}
@ -54,8 +60,7 @@ namespace Spek {
uint32 *p = &data[i];
*p = color;
}
//queue_draw_area (sample, 0, 1, allocation.height);
queue_draw ();
queue_draw_area (PADDING + sample, PADDING, 1, allocation.height - 2 * PADDING);
}
private override bool expose_event (EventExpose event) {
@ -73,8 +78,10 @@ namespace Spek {
// Draw the spectrogram.
if (image != null) {
cr.translate (40, 40);
cr.scale ((w - 80) / w, (h - 80) / h);
cr.translate (PADDING, PADDING);
cr.scale (
(w - 2 * PADDING) / image.get_width (),
(h - 2 * PADDING) / image.get_height ());
cr.set_source_surface (image, 0, 0);
cr.paint ();
cr.identity_matrix ();
@ -84,7 +91,7 @@ namespace Spek {
cr.set_source_rgb (1, 1, 1);
cr.set_line_width (1);
cr.set_antialias (Antialias.NONE);
cr.rectangle (40, 40, w - 80, h - 80);
cr.rectangle (PADDING, PADDING, w - 2 * PADDING, h - 2 * PADDING);
cr.stroke ();
return true;
}