Drawing a circle in opengl es android, squiggly boundaries
- by ladiesMan217
I am new to OpenGL ES and facing a hard time drawing a circle on my GLSurfaceView. Here's what I have so far.
the Circle Class
public class MyGLBall {
private int points=40;
private float vertices[]={0.0f,0.0f,0.0f};
private FloatBuffer vertBuff;
//centre of circle
public MyGLBall(){
vertices=new float[(points+1)*3];
for(int i=3;i<(points+1)*3;i+=3){
double rad=(i*360/points*3)*(3.14/180);
vertices[i]=(float)Math.cos(rad);
vertices[i+1]=(float) Math.sin(rad);
vertices[i+2]=0;
}
ByteBuffer bBuff=ByteBuffer.allocateDirect(vertices.length*4);
bBuff.order(ByteOrder.nativeOrder());
vertBuff=bBuff.asFloatBuffer();
vertBuff.put(vertices);
vertBuff.position(0);
}
public void draw(GL10 gl){
gl.glPushMatrix();
gl.glTranslatef(0, 0, 0);
// gl.glScalef(size, size, 1.0f);
gl.glColor4f(1.0f,1.0f,1.0f, 1.0f);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertBuff);
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 0, points/2);
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glPopMatrix();
}
}
I couldn't retrieve the screenshot of my image but here's what it looks like
As you can see the border has crests and troughs thereby renering it squiggly which I do not want. All I want is a simple curve
