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Auto-fitting duration ticks

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This commit is contained in:
Alexander Kojevnikov 2010-05-16 19:30:53 +10:00
parent f625d32a6e
commit 5ef71cbb9b
1 changed files with 37 additions and 7 deletions
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44
src/spek-spectrogram.vala
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@ -116,21 +116,46 @@ namespace Spek {
cr.paint ();
cr.identity_matrix ();
// Time ruler.
int64[] time_points = {0, source.duration};
// Prepare to draw the time ruler.
cr.set_source_rgb (1, 1, 1);
cr.set_line_width (1);
cr.set_antialias (Antialias.NONE);
cr.select_font_face ("sans-serif", FontSlant.NORMAL, FontWeight.NORMAL);
cr.set_font_size (10.0);
// Mesure the label text.
TextExtents ext;
cr.text_extents ("00:00", out ext);
double tick_width = ext.width;
foreach (var pt in time_points) {
var seconds = (int) (pt / 1000000000);
var label = "%d:%02d".printf (seconds / 60, seconds % 60);
var pos = PADDING + (w - 2 * PADDING) * pt / source.duration;
double label_width = ext.width;
// Select the factor to use, we want some space between the labels.
int duration_seconds = (int) (source.duration / 1000000000);
int[] time_factors = {1, 2, 5, 10, 20, 30, 1*60, 2*60, 5*60, 10*60, 20*60, 30*60};
int time_factor = 0;
foreach (var factor in time_factors) {
if (time_to_px (factor, w, duration_seconds) >= 1.5 * label_width) {
time_factor = factor;
break;
}
}
// Add the ticks.
int[] ticks = { 0, duration_seconds };
if (time_factor > 0) {
for (var tick = time_factor; tick < duration_seconds; tick += time_factor) {
ticks += tick;
}
// The last item should be skipped, it's too close to the end tick.
// TODO: `ticks = ticks[0:-1]` crashes, file a bug.
ticks = ticks[0:ticks.length - 1];
}
// Draw the ticks.
foreach (var tick in ticks) {
var label = "%d:%02d".printf (tick / 60, tick % 60);
var pos = PADDING + time_to_px (tick, w, duration_seconds);
cr.text_extents (label, out ext);
// TODO: use font measurements instead ext.height
cr.move_to (pos - ext.width / 2, h - PADDING + GAP + ext.height);
cr.show_text (label);
cr.move_to (pos, h - PADDING);
@ -154,6 +179,11 @@ namespace Spek {
cr.identity_matrix ();
}
// TODO: factor out the ruler logic and pass this as an anonymous method.
private double time_to_px (int time, double w, int duration_seconds) {
return (w - 2 * PADDING) * time / duration_seconds;
}
private void put_pixel (ImageSurface surface, int x, int y, uint32 color) {
var i = y * surface.get_stride () + x * 4;
unowned uchar[] data = surface.get_data ();