GrafitiDemo.Viewer.DrawCalibrationGrid C# (CSharp) Méthode

        private void DrawCalibrationGrid()
        {
            float grid_width = 7, grid_height = 7;

            Gl.glPushMatrix();
            Gl.glColor4d(1, 1, 1, 1);
            Gl.glLineWidth(3.0f);

            // grid
            Gl.glBegin(Gl.GL_LINES);
            for (float k = -0f; k < 1; k += 0.999f / (grid_width - 1.0f))
            {
                Gl.glVertex2f(k, 0.0f);
                Gl.glVertex2f(k, 1.0f);
            }

            for (float k = -0f; k < 1; k += 0.999f / (grid_height - 1.0f))
            {
                Gl.glVertex2f(0f, k);
                Gl.glVertex2f(1.0f, k);
            }
            Gl.glEnd();
            // circles
            Gl.glBegin(Gl.GL_LINE_LOOP);
            for (float angle = 0.0f; angle < Math.PI * 2; angle += ((float)Math.PI / 40.0f))
                Gl.glVertex2d((Math.Sin(angle) / 2) + 0.5, (Math.Cos(angle) / 2) + 0.5);
            Gl.glEnd();

            Gl.glBegin(Gl.GL_LINE_LOOP);
            for (float angle = 0.0f; angle < Math.PI * 2; angle += ((float)Math.PI / 30.0f))
                Gl.glVertex2d(Math.Sin(angle) * 0.33 + 0.5, Math.Cos(angle) * 0.33 + 0.5);
            Gl.glEnd();

            Gl.glBegin(Gl.GL_LINE_LOOP);
            for (float angle = 0.0f; angle < Math.PI * 2; angle += ((float)Math.PI / 30.0f))
                Gl.glVertex2d(Math.Sin(angle) * 0.165 + 0.5, Math.Cos(angle) * 0.165 + 0.5);
            Gl.glEnd();
            Gl.glPopMatrix();
        }