Zoom to centre, for now

static/picture-annotation.py

@@ -718,17 +718,10 @@ def on_wheel(event):

                                
                                
                                
                            
                                
                                    
                                        
                                            718  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            719  
                                                event.preventDefault()
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            720  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        721 -
                                            scale_exponent += (-1 if event.deltaY > 0 else 1) / 16
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        722 -
                                        
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        721 +
                                            # Adjust scale exponent and compute new scale
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        722 +
                                            scale_exponent += (-1 if event.deltaY > 0 else 1) / 4
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            723  
                                                new_scale = 2 ** scale_exponent
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        724 -
                                        
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        725 -
                                            rect = zoom_container.getBoundingClientRect()
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        726 -
                                            pointer_x = event.clientX - rect.left
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        727 -
                                            pointer_y = event.clientY - rect.top
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        728 -
                                        
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        729 -
                                            translate_x = pointer_x - (pointer_x - translate_x) * (new_scale / scale)
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        730 -
                                            translate_y = pointer_y - (pointer_y - translate_y) * (new_scale / scale)
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        731 -
                                        
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        724 +
                                            # Update scale
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            725  
                                                scale = new_scale
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            726  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            727  
                                                update_transform()