perl-opengl-鼠标事件与球体视角

xiaodouya33

#!/usr/bin/perl -w
use strict;
use warnings;
use OpenGL qw/ :all /;
use OpenGL::Config;   
#!/usr/bin/perl -w
use strict;
use warnings;
use OpenGL qw/ :all /;
use OpenGL::Config;   

my $a=rand(1);
my $b=rand(1);
my $c=rand(1);
my $look=0.1;
my $lookx=0.1;
my $looky=0.1;
glutInit();
glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE);
glutInitWindowPosition(100,100);
glutInitWindowSize(400,400);
glutCreateWindow("my  OpenGL program");
glClearColor(0,0,0,255);
glClear(GL_COLOR_BUFFER_BIT);  
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-2,2,-2,2,-2,2);
gluLookAt($look,$look,$look,0.0,0.0,0.0,0.0,$look,0.0);
glMatrixMode(GL_MODELVIEW);
glutDisplayFunc(\&mydis);
glutMouseFunc(\&mymouse);
glutMainLoop();
sub mydis()
{
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glClearColor(0,0,0,255);
glClear(GL_COLOR_BUFFER_BIT);
&qiu();
}
sub mymouse()
{
my ($button,$state,$myx,$myy)=@_;
if ($button==GLUT_LEFT_BUTTON  and $state==GLUT_DOWN)
{
$look=($myx+$myy)/2/400;
$lookx=($myx-200)/400;
$looky=(200-$myy)/400;               
}
print "mouse x:$myx-y:$myy-look:$look\n";
}
sub qiu()
{
my $x;
my $y;
my $z;
my $c=3.1415926/180;
glLoadIdentity();
gluLookAt($lookx,$looky,$look,0.0,0.0,0.0,0.0,$look,0.0);
for (my $phi=-80.00;$phi<=80.00;$phi+=20.00)
{
my $phir=$c*$phi;
my $phir20=$c*($phi+20);     
glBegin(GL_QUAD_STRIP);
glColor3f($a,$b,$c);
for (my $theta=-180.00;$theta<=180.00;$theta+=20.00)
{
my $thetar=$c*$theta;
$x=sin($thetar)*cos($phir);
$y=cos($thetar)*cos($phir);
$z=sin($phir);
glVertex3d($x,$y,$z);
$x=sin($thetar)*cos($phir20);
$y=cos($thetar)*cos($phir20);
$z=sin($phir20);         
glVertex3d($x,$y,$z);  
}  
glEnd();
glFlush();
}
}