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manderin87

Polygon rotation is too fast compared to objects rotation

36 posts in this topic

They both recieve the same mDegree value.

Could it be something with the way i move the degree past 0?

[CODE]
if(mDegree > 360) {
mDegree = 0;
} else if(mDegree < 0) {
mDegree = 360;
}
[/CODE]
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Does the SpriteBatch draw method deffinitely take the angle in degrees and not radians?

Could you show us how SpriteBatch uses mDegree?

Is this the same SpriteBatch method as referred to here?
http://tylerforsythe.com/2011/11/xna-spritebatch-draw-and-icecream-use-a-rotation-value-in-radians/

On second thoughts I see that is a different SpriteBatch :( Edited by de_mattT
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the draw method i use is above, but spritebatch deffinitely uses degrees

its located here [url="https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g2d/SpriteBatch.java"]https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g2d/SpriteBatch.java[/url]
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This method is better for fixing the degree but it didnt change the behavior that I am experiencing

[CODE]
if(mDegree >= 360) {
mDegree -= 360;
} else if(mDegree < 0) {
mDegree += 360;
}
[/CODE]
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Is this a funciton you've defined yourself "Utilities.toRadians()"? If so can you post the code?
Is there a reason why you aren't using "Math.toRadians()"?
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[quote name='manderin87' timestamp='1354232099' post='5005498']
This method is better for fixing the degree but it didnt change the behavior that I am experiencing

[CODE]
if(mDegree >= 360) {
mDegree -= 360;
} else if(mDegree < 0) {
mDegree += 360;
}
[/CODE]
[/quote]

Try:
[source lang="java"]
while(mDegree >= 360) {mDegree -= 360;}
while(mDegree < 0) {mDegree += 360;}
[/source]

Edit - Aagh, derp. Sorry for double post. Edited by Khatharr
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[quote name='Khatharr' timestamp='1354244436' post='5005544']
Does SpriteBatch::draw() want degrees or radians?
[/quote]

Degrees
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[quote name='Khatharr' timestamp='1354244657' post='5005545']
while(mDegree >= 360) {mDegree -= 360;}
while(mDegree < 0) {mDegree += 360;}
[/quote]

Didnt fix it. I know it has to be something wrong with the polygone rotation, its not working correctly. Ive stared at it for hours and i dont know what the problem is. Ive checked several places and the algorithm seems to be correct, but its not rotating correctly.
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Okay, looking back over the whole thread, can you post the whole code path for this thing? Seems like it'll be faster than everyone guessing at it.

[quote name='manderin87' timestamp='1354245110' post='5005548']
Didnt fix it. I know it has to be something wrong with the polygone rotation, its not working correctly. Ive stared at it for hours and i dont know what the problem is. Ive checked several places and the algorithm seems to be correct, but its not rotating correctly.
[/quote]

Yeah, that wasn't intended as a fix. Just a more complete solution for rotating something into range without modulation. Edited by Khatharr
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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

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

for(Point p : points) {
mRotatedPoints.add(new Point(p));
mOriginalPoints.add(new Point(p));
}
}
[/CODE]

And the rotation code.

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

Point p = mRotatedPoints.get(i);
p.x = x;
p.y = y;
}
[/CODE]

thanks everyone for the help and forgive my idiocy for not noticing they were they same instead of being seperate. Edited by manderin87
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