static void GLUT_Paint( DaoProcess *proc, DaoValue *p[], int N )
{
GLUT_SetGraphics( proc, p, N );
DaoxCanvas_SetViewport( daox_current_canvas,
-window_width/2, window_width/2, -window_height/2, window_height/2 );
glutMainLoop();
}
void DaoxCanvas_Move( int x, int y )
{
DaoxAABBox2D box = daox_current_canvas->viewport;
float xscale = (box.right - box.left) / window_width;
float yscale = (box.top - box.bottom) / window_height;
box.left -= (x - last_x) * xscale;
box.right -= (x - last_x) * xscale;
box.bottom += (y - last_y) * xscale;
box.top += (y - last_y) * xscale;
last_x = x;
last_y = y;
if( box.left > 0.9*window_width ) return;
if( box.right < 0.1*window_width ) return;
if( box.bottom > 0.9*window_height ) return;
if( box.top < 0.1*window_height ) return;
DaoxCanvas_SetViewport( daox_current_canvas, box.left, box.right, box.bottom, box.top );
}
void DaoxWindow_MoveCanvas( DaoxWindow *self, DaoxCanvas *canvas, int x, int y )
{
DaoxAABBox2D box = canvas->viewport;
float xscale = (box.right - box.left) / self->width;
float yscale = (box.top - box.bottom) / self->height;
int dx = x - self->cursorPosX;
int dy = y - self->cursorPosY;
box.left -= dx * xscale;
box.right -= dx * xscale;
box.bottom += dy * yscale;
box.top += dy * yscale;
// TODO: Use canvas bounding box to do it;
//if( box.left > 0.9*self->width ) return;
//if( box.right < 0.1*self->width ) return;
//if( box.bottom > 0.9*self->height ) return;
//if( box.top < 0.1*self->height ) return;
DaoxCanvas_SetViewport( canvas, box.left, box.right, box.bottom, box.top );
}
void DaoxCanvas_Zoom( int zoomin )
{
DaoxAABBox2D box = daox_current_canvas->viewport;
float width, height, dw, dh;
width = box.right - box.left;
height = box.top - box.bottom;
dw = 0.0;
dh = 0.0;
if( zoomin ){
dw = width / 6;
dh = height / 6;
}else{
dw = - width / 4;
dh = - height / 4;
}
box.left += dw;
box.right -= dw;
box.bottom += dh;
box.top -= dh;
DaoxCanvas_SetViewport( daox_current_canvas, box.left, box.right, box.bottom, box.top );
}
