/**
* create a random surface
*
* @param obj
* @param x1:surface x begin
* @param x2:surface x end
* @param y1:surface y begin
* @param y2:surface y end
* @return: the surface mObject
*/
private mObject createRandomSurface(mObject obj, int x1, int x2, int y1, int y2) {
int i = 0, j = 0;
x1 /= 20;
x2 /= 20;
y1 /= 20;
y2 /= 20;
mPoint3[][] points = new mPoint3[x2 - x1 + 1][y2 - y1 + 1];
for (i = y1; i <= y2; i++) {
for (j = x1; j <= x2; j++) {
points[j - x1][i - y1] =
new mPoint3(j * 20, i * 20, (float) (Math.random() * 70 * Math.exp(0 - 0.3 * j)));
}
}
return new mSurface(points, x2 - x1 + 1, y2 - y1 + 1);
}
