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
}