+ // Camera dragging
+ static v2f drag_origin; // x/y pixel
+
+ if( vg_get_button_down( "tertiary" ) )
+ v2_copy( vg_mouse, drag_origin );
+ else if( vg_get_button( "tertiary" ) )
+ {
+ // get offset
+ v2_sub( vg_mouse, drag_origin, drag_offset );
+ v2_div( drag_offset, (v2f){ vg_window_x, vg_window_y }, drag_offset );
+ v2_mul( drag_offset, (v2f){ size_current*2.0f, -size_current*r1*2.0f }, drag_offset );
+ }
+ else
+ {
+ v2_copy( result_view, view_point );
+ v2_copy( (v2f){0.0f,0.0f}, drag_offset );
+ }
+
+ // calculate relative position of mouse in view_point space
+
+ { // Debug
+ v2f lwr; v2f upr;
+ v2f lwr1; v2f upr1;
+ v2f p0; v2f p1;
+ v2f vo;
+ v2f mouse_viewspace;
+
+ float rsize = size-view_zoom_extra;
+
+ v2_sub( (v2f){ -size + 0.1f, -size*r1 + 0.1f }, origin, lwr );
+ v2_sub( (v2f){ size - 0.1f, size*r1 - 0.1f }, origin, upr );
+
+ v2_sub( (v2f){ -rsize, -rsize*r1 }, vt_target, lwr1 );
+ v2_sub( (v2f){ rsize, rsize*r1 }, vt_target, upr1 );
+
+ vg_line_box( lwr, upr, 0xffffff00 );
+ vg_line_box( lwr1, upr1, 0xff00ff00 );
+
+ // Calculate vector towards mouse from vt_target
+ v2f mouse_delta;
+ v2_muls( vt_target, -1.0f, vo );
+
+ v2_sub( vt_target, vg_mouse_ws, mouse_delta );
+
+ vg_line( vo, vg_mouse_ws, 0xffffffff );
+
+ // Mouse Locally
+ v2_div( vg_mouse, (v2f){ vg_window_x, vg_window_y }, mouse_viewspace );
+ mouse_viewspace[0] = mouse_viewspace[0]*rsize*2.0f;
+ mouse_viewspace[1] = (1.0f-mouse_viewspace[1])*rsize*2.0f*r1;
+
+ v2_add( lwr1, mouse_viewspace, mouse_viewspace );
+
+ vg_line( mouse_viewspace, (v2f){0.0f, 0.0f}, 0xff0000ff );
+ //}
+
+ // Zoom
+ view_zoom_extra = vg_clampf( view_zoom_extra + vg_mouse_wheel[1], 0.0f, size - 4.0f );
+
+ // Zoom offset adjust
+ rsize = size-view_zoom_extra;
+ v2_sub( (v2f){ -rsize, -rsize*r1 }, vt_target, lwr1 );
+ v2_sub( (v2f){ rsize, rsize*r1 }, vt_target, upr1 );
+
+ v2f mouse_viewspace_new;
+ v2_div( vg_mouse, (v2f){ vg_window_x, vg_window_y }, mouse_viewspace_new );
+ mouse_viewspace_new[0] = mouse_viewspace_new[0]*rsize*2.0f;
+ mouse_viewspace_new[1] = (1.0f-mouse_viewspace_new[1])*rsize*2.0f*r1;
+
+ v2_add( lwr1, mouse_viewspace_new, mouse_viewspace_new );
+
+ v2f zoom_offset;
+ v2_sub( mouse_viewspace, mouse_viewspace_new, zoom_offset );
+ v2_muladds( view_point, zoom_offset, -1.0f, view_point );
+ }
+