MouseEngineLoopStrip Actionscript
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Generates several mouse xy values with delays and bounce. See MouseEngineInit for further information.
author Olaf Havnes
version Revision: 1.1 Date: 2003/02/13 21:23:47
since SWFIT1.0
Get the mouse x position.
The real mouse x position
old_x = x;
x = _x;
The clipped mouse x position
if (x < /:x_min) cl_x = /:x_min;
else if (x > /:x_max) cl_x = /:x_max;
else cl_x = x;
The delayed mouse x position
dc_x = (dc_x * /:delay + cl_x) / (/:delay + 1);
Repeat for y.
The real mouse y position
old_y = y;
y = _y;
The clipped mouse y position
if (y < /:y_min) cl_y = /:y_min;
else if (y > /:y_max) cl_y = /:y_max;
else cl_y = y;
The delayed mouse y position
dc_y = (dc_y * /:delay + cl_y) / (/:delay + 1);
The camera model uses the delayed-clipped mouse values, producing values between - 1 and 1 for camera-position, reversing the sign for the y-values (+ is now up).
cam_x = dc_x / /:cw_2 + /:xwa;
cam_y = - dc_y / /:ch_2 + /:ywa;
Pre-compute
cam_x2 = cam_x * cam_x;
cam_y2 = cam_y * cam_y;
cam_z2 = cam_len_sq - cam_x2 - cam_y2;
Iterate just once through Newton's method. I doubt anybody is able to move the
mouse quick enough to produce a significant error on this value, especially since
the camera uses the delayed mouse values.
cam_z = (cam_z + cam_z2 / cam_z) / 2;
Store in _level0.
/:camera_x = cam_x;
/:camera_y = cam_y;
/:camera_z = cam_z;
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