use strict;
use warnings;
use OpenGL;
use Prima::OpenGL;
use Prima::Application;
$::application-> begin_paint;
exit unless $::application-> gl_begin_paint;
$::application-> line(0,0,1000,1000);
glViewport(100, 100, 200, 200);
glClearColor(0,0,1,1);
glClear(GL_COLOR_BUFFER_BIT);
glOrtho(-1,1,-1,1,-1,1);
glColor3f(1,0,0);
glBegin(GL_POLYGON);
        glVertex2f(-0.5,-0.5);
        glVertex2f(-0.5, 0.5);
        glVertex2f( 0.5, 0.5);
        glVertex2f( 0.5,-0.5);
glEnd();
glFinish();
$::application-> gl_end_paint;
$::application-> end_paint;