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Attention | Topic was automatically imported from the old Question2Answer platform. |
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Asked By | miladh06 |
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Old Version | Published before Godot 3 was released. |
Hi, Is there any algorithm or example for pinch zoom?
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Reply From: | mafious |
This isn’t as simple in godot as everyone would like it to be, but you can find some examples that kinda work on this thread: Loading...
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Reply From: | miladh06 |
this works for pinch and pan:
extends Camera2D
var first_distance =0
var events={}
var percision = 10
var current_zoom
var maximum_zoomin = Vector2(0.5,0.5)
var minimum_zoomout = Vector2(3,3)
var center
func _ready():
set_process_unhandled_input(true)
pass
func is_zooming():
return events.size()>1
func dist():
var first_event =null
var result
for event in events:
if first_event!=null:
result = events[event].pos.distance_to(first_event.pos)
break
first_event = events[event]
return result
func center():
var first_event =null
var result
for event in events:
if first_event!=null:
result = (map_pos(events[event].pos) + map_pos(first_event))/2
break
first_event = events[event].pos
return result
func map_pos(pos):
var mtx = get_viewport().get_canvas_transform()
var mt = mtx.affine_inverse()
var p = mt.xform(pos)
return p
func _unhandled_input(event):
if event.type == InputEvent.SCREEN_TOUCH and event.is_pressed():
events[event.index]=event
if events.size()>1:
current_zoom=get_zoom()
first_distance = dist()
center = center()
elif event.type == InputEvent.SCREEN_TOUCH and not event.is_pressed():
events.erase(event.index)
elif event.type == InputEvent.SCREEN_DRAG :
events[event.index] = event
if events.size()>1:
var second_distance = dist()
if abs(first_distance-second_distance)>percision:
var new_zoom =Vector2(first_distance/second_distance,first_distance/second_distance)
var zoom = new_zoom*current_zoom
if zoom<minimum_zoomout and zoom>maximum_zoomin:
set_zoom(zoom)
elif zoom>minimum_zoomout:
set_zoom(minimum_zoomout)
elif zoom<maximum_zoomin:
set_zoom(maximum_zoomin)
set_global_pos(center)
elif events.size()==1:
set_global_pos(get_global_pos()-event.relative_pos*get_zoom()*2)
Thx for your example. I had some errors In Godot 3.2.2
I tried to update your code.
extends Camera2D
var first_distance =0
var events={}
var percision = 10
var current_zoom
var maximum_zoomin = Vector2(0.5,0.5)
var minimum_zoomout = Vector2(3,3)
var center
func _ready():
set_process_unhandled_input(true)
pass
func is_zooming():
return events.size()>1
func dist():
var first_event =null
var result
for event in events:
if first_event!=null:
result = events[event].get_position().distance_to(first_event.get_position())
break
first_event = events[event]
return result
func centerino():
var first_event =null
var result
for event in events:
if first_event!=null:
result = (map_pos(events[event].get_position()) + map_pos(first_event))/2
break
first_event = events[event].get_position()
return result
func map_pos(pos):
var mtx = get_viewport().get_canvas_transform()
var mt = mtx.affine_inverse()
var p = mt.xform(pos)
return p
func _unhandled_input(event):
if event is InputEventScreenTouch and event.is_pressed():
events[event.index]=event
if events.size()>1:
current_zoom=get_zoom()
first_distance = dist()
center = centerino()
elif event is InputEventScreenTouch and not event.is_pressed():
events.erase(event.index)
elif event is InputEventScreenDrag :
events[event.index] = event
if events.size()>1:
var second_distance = dist()
if abs(first_distance-second_distance)>percision:
var new_zoom =Vector2(first_distance/second_distance,first_distance/second_distance)
var zoom = new_zoom*current_zoom
if zoom<minimum_zoomout and zoom>maximum_zoomin:
set_zoom(zoom)
elif zoom>minimum_zoomout:
set_zoom(minimum_zoomout)
elif zoom<maximum_zoomin:
set_zoom(maximum_zoomin)
set_global_position(center)
elif events.size()==1:
set_global_position(get_global_position()-event.get_relative()*get_zoom()*2)
iLLe | 2020-07-07 17:38
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Reply From: | neoncube |
For anyone running across this question nowadays, I’d highly recommend the tutorial at https://kidscancode.org/godot_recipes/2d/touchscreen_camera/ 