Hi leigh!
I've tried, but it doesn't work... the quad goes in a wrong position :
(
My quad has these coordinates
//vertex bottom left
vertex[0] = 9.5f;
vertex[1] = 10f;
vertex[2] = 0.0f;
//top left
vertex[3] = 9.5f;
vertex[4] = 11.0f;
vertex[5] = 0.0f;
//bottom right
vertex[6] = 10.5f;
vertex[7] = 10f;
vertex[8] = 0.0f;
//top right
vertex[9] = 10.5;
vertex[10] = 11f;
vertex[11] = 0.0f;
and this is my draw function...
public void draw(GL10 gl){
gl.glPushMatrix();
gl.glTranslatef(-10, -10.5f, 0); //to the origin
gl.glRotatef(45, 0, 0, -1); //rotate
gl.glTranslatef(10, 10.5f, -2.0f); //back to previous position
// Enabled the vertices buffer for writing and to be used during
// rendering.
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
// Specifies the location and data format of an array of vertex
// coordinates to use when rendering.
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, markerBuffer);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, NUMERO_VERTICI);
// Disable the vertices buffer.
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glPopMatrix();
}
On 18 Giu, 17:31, Leigh McRae <leigh.mc...@lonedwarfgames.com> wrote:
> Translate the quad to the origin, rotate, translate back.
>
> Leigh
>
> On 6/18/2010 11:12 AM, Paolo wrote:
>
>
>
>
>
> > Hi guys!
> > I'm a newbie in OpenGL. :D
> > I'm trying to rotate a quad around its center.
>
> > This is my scenario: I've a quad, drawn with TRIANGLE_STRIP, at
> > specified coordinates. Now I want to rotate of 45 degrees around its
> > center, without move it from its position, not around the origin of
> > the aces.
> > I hope you are able to understand my english... :)
>
> > How can I do that?
>
> > Thanks
>
> > Paolo
>
> --
> Leigh McRaewww.lonedwarfgames.com
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