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### #Actualmanderin87

Posted 30 November 2012 - 01:12 PM

Ive rechecked everything... The rotation code was the problem.... I made two lists to keep track of the points... the original points and the rotated points. Both were pointing to the same object, i thought they were seperate, but they were not... so I just made both lists create a new point when adding to the list. The rotation is now correct.

Here is the polygon constructor

public Polygon(Point... points) {
if(points.length < 3) {
throw new IllegalArgumentException("polygons must contain at least 3 points.");
}

for(Point p : points) {
}
}


And the rotation code.

public void rotate(float x0, float y0, float degree) {
for(int i = 0; i < mOriginalPoints.size(); i++) {
Point point = mOriginalPoints.get(i);

float x = (float) (x0 + (point.x - x0) * Math.cos(Utilities.toRadians(degree)) -
float y = (float) (y0 + (point.x - x0) * Math.sin(Utilities.toRadians(degree)) +

Point p = mRotatedPoints.get(i);
p.x = x;
p.y = y;
}


thanks everyone for the help and forgive my idiocy for not noticing they were they same instead of being seperate.

### #1manderin87

Posted 30 November 2012 - 01:11 PM

Ive rechecked everything... The rotation code was the proble.... I made two lists to keep track of the points... the original points and the rotated points. Both were pointing to the same object, i thought they were seperate, but they were not... so I just made both lists create a new point when adding to the list. The rotation is now correct.

Here is the polygon constructor

public Polygon(Point... points) {
if(points.length < 3) {
throw new IllegalArgumentException("polygons must contain at least 3 points.");
}

for(Point p : points) {
}
}


And the rotation code.

public void rotate(float x0, float y0, float degree) {
for(int i = 0; i < mOriginalPoints.size(); i++) {
Point point = mOriginalPoints.get(i);

float x = (float) (x0 + (point.x - x0) * Math.cos(Utilities.toRadians(degree)) -