CODEWITHSUNDEEP
opengl-es
Ajay_Kumar
Ajay_Kumar

Reputation: 1387

How to draw circle in opengles

Here is my part of code to show circle on screen but unfortunate circle is not coming on screen.

glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT);
 glPushMatrix();
glLoadIdentity();
 glColor3f(0.0f,1.0f,0.0f);
glBegin(GL_LINE_LOOP);

const float DEG2RAD = 3.14159/180;

for (int i=0; i < 360; i++)
{
    float degInRad = i*DEG2RAD;
    glVertex2f(cos(degInRad)*8,sin(degInRad)*8);
}

 glEnd();
glFlush();

I am not understanding code is seems to look ok but circle is not coming on screen.

Upvotes: 1

Views: 3172

Answers (1)

Marcelo Cantos
Marcelo Cantos

Reputation: 185862

Your circle is too big. The default viewport is in the range [(-1 -1), (1 1)].

BTW, you don't need 360 segments. About 30 is usually adequate, depending on how smooth you want it.

Upvotes: 1

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