I am having a user draw a line on the screen, there is a start point and a end point. If the user extends over a certain angle I change the position of the endpoint so the user cannot extend beyond the specified angle. However it seems that when I cacluate the angle the user is drawing and make suer it is not over MAX ANGLE, and set the angle to the MAX ANGLE, there is a difference. This can be seen by when I draw the line, once i get to a certain angle, the line jumps and locks at the MAX ANGLE, but there shouldnt be any jump, it should be smooth, like the line ran into a invisible barrier. This could just be me though, my PosX and PosY are floats.
private void CheckAngle() {
double adj = Math.abs(PosX - PosX2);
double c1 = adj;
double c2 = Math.abs(PosY - PosY2);
double hyp = Math.hypot(c1, c2);
double angle = Math.cos((adj/hyp));
angle = angle * 100;
if (angle > MAX_ANGLE) {
double opp = (Math.tan(MAX_ANGLE) * Math.abs(PosX - PosX2));
if (PosY > PosY2) {
PosY2 =(float) (PosY - opp);
} else {
PosY2 =(float) (PosY + opp);
}
}
}
My answer was a combination of using radians, as well as unsing
Math.acos() & Math.atan()
so the final code looks like this
private void CheckAngle() {
double adj = Math.abs(PosX - PosX2);
double opp = Math.abs(PosY - PosY2);
double hyp = Math.sqrt((adj*adj)+(opp*opp));
double angle = Math.acos((adj/hyp));
angle = angle * 100;
angle = Math.toRadians(angle);
if (angle > MAX_ANGLE) {
opp = (Math.atan(MAX_ANGLE) * adj);
if (PosY > PosY2) {
PosY2 =(float) (PosY - opp);
} else {
PosY2 =(float) (PosY + opp);
}
}
}