public override void erase(gnu.app.displayhack.DisplayHack hack)
{
gnu.x11.Window window = hack.window;
/* Minimum radius = L/sqrt(2) ~= 0.707*L,
* where L = max(width, heigth)
* sqrt(2) = 1.414213562373095
*
* Take radius = L for faster (easier) computation.
*/
int radius = Math.Max (window.width, window.height);
int full = 360 * 64;
int delta = (full/200) * hack.eraser_delta;
int step_count = (int) Math.Ceiling ( (double)(1 + full/delta));
int start = DisplayHack.random.Next (full);
// clockwise or counter-clockwise
if (DisplayHack.random.Next()%2==0) delta = -delta;
for (int i=0; i<step_count; i++) {
window.arc (hack.display.default_gc,
window.width/2 - radius, window.height/2 - radius,
2*radius, 2*radius, (start+i*delta) % full, delta, true);
if (sleep (hack)) return;
}
hack.sleep (hack.delay/2); // before next screen
}
public override void erase(gnu.app.displayhack.DisplayHack hack)
{
gnu.x11.Window window = hack.window;
/* Minimum radius = L/sqrt(2) ~= 0.707*L,
* where L = max(width, heigth)
* sqrt(2) = 1.414213562373095
*
* Take radius = L for faster (easier) computation.
*/
int radius = Math.Max (window.width, window.height);
int full = 360 * 64;
int third = full / 3;
int start = DisplayHack.random.Next (full);
/* 200 = speed in {@link CircleWipe}
* 3 = three circles
* 2 = converge from two sides
*/
int delta = (full/200/3/2) * hack.eraser_delta;
/* 1 to offset rounding error
* 3 = three circles
* 2 = converge from two sides
*/
int step_count = 1 + full/delta/3/2;
for (int i=0; i<step_count; i++) {
// first circle
window.arc (hack.display.default_gc,
window.width/2 - radius, window.height/2 - radius,
2*radius, 2*radius, (start+i*delta) % full, delta, true);
window.arc (hack.display.default_gc,
window.width/2 - radius, window.height/2 - radius,
2*radius, 2*radius, (start-i*delta) % full, delta, true);
// second circle
window.arc (hack.display.default_gc,
window.width/2 - radius, window.height/2 - radius,
2*radius, 2*radius, (start+third+i*delta) % full, delta, true);
window.arc (hack.display.default_gc,
window.width/2 - radius, window.height/2 - radius,
2*radius, 2*radius, (start+third-i*delta) % full, delta, true);
// third circle
window.arc (hack.display.default_gc,
window.width/2 - radius, window.height/2 - radius,
2*radius, 2*radius, (start+2*third+i*delta) % full, delta, true);
window.arc (hack.display.default_gc,
window.width/2 - radius, window.height/2 - radius,
2*radius, 2*radius, (start+2*third-i*delta) % full, delta, true);
if (sleep (hack)) return;
}
hack.sleep (hack.delay/2); // before next screen
}
public override void erase(gnu.app.displayhack.DisplayHack hack)
{
hack.window.clear (false);
hack.sleep (hack.delay/2); // before next screen
}