Merge branch 'divVerent/simpler-clipped-rectangle' into 'master'

[xonotic/xonotic-data.pk3dir.git] / qcsrc / client / miscfunctions.qc

diff --git a/qcsrc/client/miscfunctions.qc b/qcsrc/client/miscfunctions.qc
index 684224c710100cc64101425a1b3de9c6df0bcc41..a7af09c7c82a146fcc259558ae8c46e9bd789a2c 100644 (file)
--- a/qcsrc/client/miscfunctions.qc
+++ b/qcsrc/client/miscfunctions.qc
@@ -214,6 +214,28 @@ vector expandingbox_resize_centered_box_offset(float sz, vector boxsize, float b
        return boxsize * (0.5 * (1 - sz));
 }
 
+// NOTE base is the central value
+// freq: circle frequency, = 2*pi*frequency in hertz
+// start_pos:
+//  -1 start from the lower value
+//   0 start from the base value
+//   1 start from the higher value
+float blink_synced(float base, float range, float freq, float start_time, int start_pos)
+{
+       // note:
+       //   RMS = sqrt(base^2 + 0.5 * range^2)
+       // thus
+       //   base = sqrt(RMS^2 - 0.5 * range^2)
+       // ensure RMS == 1
+
+       return base + range * sin((time - start_time - (M_PI / 2) * start_pos) * freq);
+}
+
+float blink(float base, float range, float freq)
+{
+       return blink_synced(base, range, freq, 0, 0);
+}
+
 void drawborderlines(float thickness, vector pos, vector dim, vector color, float theAlpha, float drawflag)
 {
        vector line_dim = '0 0 0';