badmanners/xfce4-eyes-plugin
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Implement eye position calculations in 3D coords (bug #9036).

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Current behavior is better but it still feels unnatural. This is mostly
because the eye balls are in the same x-y plane as the mouse pointer.

The attached patch calculates 3D angles of the eye sight as if the eye ball
was slightly behind the screen (at the moment the distance is hardcoded to
3x eyeball radius). Smaller z distance makes the eyeballs more independent,
larger - increases the (x-y) tracking distance (the eyes remain in their
center position longer).
This commit is contained in:
Andrzej 2013-03-03 09:45:03 +01:00 • committed by Harald Judt
parent 6e7c093a78
commit 88c2ec8222
1 changed files with 23 additions and 22 deletions
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45
panel-plugin/eyes.c
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@ -68,11 +68,10 @@ calculate_pupil_xy (EyesPlugin *eyes_applet,
gint *pupil_y,
GtkWidget *widget)
{
double sina;
double cosa;
double h;
double temp;
double nx, ny;
double distance;
double angle, angle_z;
double radius_x, radius_y;
gfloat xalign, yalign;
gint width, height;
@ -81,32 +80,34 @@ calculate_pupil_xy (EyesPlugin *eyes_applet,
height = GTK_WIDGET(widget)->allocation.height;
gtk_misc_get_alignment(GTK_MISC(widget), &xalign, &yalign);
/* calculate x,y pointer offsets wrt to eye center */
nx = x - MAX(width - eyes_applet->eye_width, 0) * xalign
- eyes_applet->eye_width / 2 - GTK_WIDGET(widget)->allocation.x;
ny = y - MAX(height - eyes_applet->eye_height, 0) * yalign
- eyes_applet->eye_height / 2 - GTK_WIDGET(widget)->allocation.y;
h = hypot (nx, ny);
if (h < 0.5 ||
abs (h) < (abs (hypot (eyes_applet->eye_height / 2,
eyes_applet->eye_width / 2))
- eyes_applet->wall_thickness
- eyes_applet->pupil_height))
{
*pupil_x = nx + eyes_applet->eye_width / 2;
*pupil_y = ny + eyes_applet->eye_height / 2;
return;
}
/* calculate eye sizes */
radius_x = (eyes_applet->eye_width -
eyes_applet->wall_thickness -
eyes_applet->pupil_width) / 2.0;
radius_y = (eyes_applet->eye_height -
eyes_applet->wall_thickness -
eyes_applet->pupil_height) / 2.0;
sina = nx / h;
cosa = ny / h;
/* by default assume the z-axis distance of 3 radius_x */
distance = 3 * radius_x;
temp = hypot ((eyes_applet->eye_width / 2) * sina, (eyes_applet->eye_height / 2) * cosa);
temp -= hypot ((eyes_applet->pupil_width / 2) * sina, (eyes_applet->pupil_height / 2) * cosa);
temp -= hypot ((eyes_applet->wall_thickness / 2) * sina, (eyes_applet->wall_thickness / 2) * cosa);
/* correction factor for aspect ratio of the eye */
if (radius_y != 0)
ny *= radius_x / radius_y;
*pupil_x = temp * sina + (eyes_applet->eye_width / 2);
*pupil_y = temp * cosa + (eyes_applet->eye_height / 2);
/* calculate 3D rotation angles */
angle_z = atan2 (ny, nx);
angle = atan2 (hypot (nx, ny), distance);
/* perform 3D rotation of a vector [0,0,1] (z=1) */
*pupil_x = radius_x * sin (angle) * cos (angle_z) + eyes_applet->eye_width / 2;
*pupil_y = radius_y * sin (angle) * sin (angle_z) + eyes_applet->eye_height / 2;
}