class GraphicsCanvas2D:
"""
Set up the scene with initial conditions.
- White background
- Width, height
- Title, caption
- Axes drawn (if applicable)
:param height: Height of the canvas on screen (Pixels), defaults to 500.
:type height: `int`, optional
:param width: Width of the canvas on screen (Pixels), defaults to 1000.
:type width: `int`, optional
:param title: Title of the plot. Gets displayed above canvas, defaults to ''.
:type title: `str`, optional
:param caption: Caption (subtitle) of the plot. Gets displayed below the canvas, defaults to ''.
:type caption: `str`, optional
:param grid: Whether a grid should be displayed in the plot, defaults to `True`.
:type grid: `bool`, optional
"""
def __init__(self,
height=500,
width=1000,
title='',
caption='',
grid=True):
# Create a new independent scene
self.scene = canvas()
# Apply the settings
self.scene.background = color.white
self.scene.width = width
self.scene.height = height
self.scene.autoscale = False
# Disable default controls
self.scene.userpan = False # Remove shift+mouse panning (key overwritten)
self.scene.userzoom = True # Keep zoom controls (scrollwheel)
self.scene.userspin = False # Remove ctrl+mouse enabled to rotate
self.__grid_visibility = grid
self.__camera_lock = False
# Apply HTML title/caption
if title != '':
self.scene.title = title
self.__default_caption = caption
if caption != '':
self.scene.caption = caption
# Rotate the camera
# convert_grid_to_z_up(self.scene)
# Any time a key or mouse is held down, run the callback function
rate(30) # 30Hz
self.scene.bind('keydown', self.__handle_keyboard_inputs)
# Create the grid, and display if wanted
self.__graphics_grid = GraphicsGrid(self.scene)
# Toggle grid to 2D
self.__graphics_grid.toggle_2d_3d()
# Lock the grid
self.__graphics_grid.set_relative(False)
# Turn off grid if applicable
if not self.__grid_visibility:
self.__graphics_grid.set_visibility(False)
# Reset the camera to known spot
self.__reset_camera()
self.__graphics_grid.update_grid()
############################
# Canvas Management
############################
# TODO
def clear_scene(self):
pass
def grid_visibility(self, is_visible):
"""
Update the grid visibility in the scene
:param is_visible: Whether the grid should be visible or not
:type is_visible: `bool`
"""
self.__graphics_grid.set_visibility(is_visible)
############################
# UI Management
############################
# TODO
def __setup_ui_controls(self):
pass
def __handle_keyboard_inputs(self):
"""
Pans amount dependent on distance between camera and focus point.
Closer = smaller pan amount
A = move left (pan)
D = move right (pan)
W = move forward (pan)
S = move backward (pan)
<- = rotate left along camera axes (rotate)
-> = rotate right along camera axes (rotate)
^ = rotate up along camera axes (rotate)
V = rotate down along camera axes (rotate)
Q = roll left (rotate)
E = roll right (rotate)
space = move up (pan)
shift = move down (pan)
ctrl + LMB = rotate (Default Vpython)
"""
# If camera lock, just skip the function
if self.__camera_lock:
return
# Constants
pan_amount = 0.02 # units
rot_amount = 1.0 # deg
# Current settings
cam_distance = self.scene.camera.axis.mag
cam_pos = vector(self.scene.camera.pos)
cam_focus = vector(self.scene.center)
# Weird manipulation to get correct vector directions. (scene.camera.up always defaults to world up)
cam_axis = (vector(self.scene.camera.axis)) # X
cam_side_axis = self.scene.camera.up.cross(cam_axis) # Y
cam_up = cam_axis.cross(cam_side_axis) # Z
cam_up.mag = cam_axis.mag
# Get a list of keys
keys = keysdown()
# Userspin uses ctrl, so skip this check to avoid changing camera pose while ctrl is held
if 'ctrl' in keys:
return
################################################################################################################
# PANNING
# Check if the keys are pressed, update vectors as required
# Changing camera position updates the scene center to follow same changes
if 'w' in keys:
cam_pos = cam_pos + cam_axis * pan_amount
if 's' in keys:
cam_pos = cam_pos - cam_axis * pan_amount
if 'a' in keys:
cam_pos = cam_pos + cam_side_axis * pan_amount
if 'd' in keys:
cam_pos = cam_pos - cam_side_axis * pan_amount
if ' ' in keys:
cam_pos = cam_pos + cam_up * pan_amount
if 'shift' in keys:
cam_pos = cam_pos - cam_up * pan_amount
# Update camera position before rotation (to keep pan and rotate separate)
self.scene.camera.pos = cam_pos
################################################################################################################
# Camera Roll
# If only one rotation key is pressed
if 'q' in keys and 'e' not in keys:
# Rotate camera up
cam_up = cam_up.rotate(angle=-radians(rot_amount), axis=cam_axis)
# Set magnitude as it went to inf
cam_up.mag = cam_axis.mag
# Set
self.scene.up = cam_up
# If only one rotation key is pressed
if 'e' in keys and 'q' not in keys:
# Rotate camera up
cam_up = cam_up.rotate(angle=radians(rot_amount), axis=cam_axis)
# Set magnitude as it went to inf
cam_up.mag = cam_axis.mag
# Set
self.scene.up = cam_up
################################################################################################################
# CAMERA ROTATION
d = cam_distance
move_dist = sqrt(d**2 + d**2 -
2 * d * d * cos(radians(rot_amount))) # SAS Cosine
# If only left not right key
if 'left' in keys and 'right' not in keys:
# Calculate distance to translate
cam_pos = cam_pos + norm(cam_side_axis) * move_dist
# Calculate new camera axis
cam_axis = -(cam_pos - cam_focus)
if 'right' in keys and 'left' not in keys:
cam_pos = cam_pos - norm(cam_side_axis) * move_dist
cam_axis = -(cam_pos - cam_focus)
if 'up' in keys and 'down' not in keys:
cam_pos = cam_pos + norm(cam_up) * move_dist
cam_axis = -(cam_pos - cam_focus)
if 'down' in keys and 'up' not in keys:
cam_pos = cam_pos - norm(cam_up) * move_dist
cam_axis = -(cam_pos - cam_focus)
# Update camera position and axis
self.scene.camera.pos = cam_pos
self.scene.camera.axis = cam_axis
def __reset_camera(self):
"""
Reset the camera to a known position
"""
# Reset Camera
self.scene.camera.pos = vector(5, 5, 12) # Hover above (5, 5, 0)
# Ever so slightly off focus, to ensure grid is rendered in the right region
# (if directly at, draws numbers wrong spots)
self.scene.camera.axis = vector(-0.001, -0.001,
-12) # Focus on (5, 5, 0)
self.scene.up = y_axis_vector
############################
# Drawing Functions
############################
def draw_path(self, xy_path, colour=None, thickness=0.05):
"""
Draw a line from point to point in the 2D path
:param xy_path: The path to draw on the canvas
:type xy_path: `list`
:param colour: RGB list to colour the line to
:type colour: `list`
:param thickness: Thickness of the line
:type thickness: `float`
"""
# Default colour to black
if colour is None:
colour = [0, 0, 0]
if colour[0] > 1.0 or colour[1] > 1.0 or colour[2] > 1.0 or \
colour[0] < 0.0 or colour[1] < 0.0 or colour[2] < 0.0:
raise ValueError("RGB values must be normalised between 0 and 1")
# For every point in the list, draw a line to the next one (excluding last point)
for point in range(0, len(xy_path) - 1):
x1 = xy_path[point][0]
y1 = xy_path[point][1]
p1 = vector(x1, y1, 0)
x2 = xy_path[point + 1][0]
y2 = xy_path[point + 1][1]
p2 = vector(x2, y2, 0)
create_line(p1, p2, self.scene, colour=colour, thickness=thickness)
class GraphicsCanvas3D:
"""
Set up the scene with initial conditions.
- White background
- Width, height
- Title, caption
- Axes drawn (if applicable)
:param height: Height of the canvas on screen (Pixels), defaults to 360.
:type height: `int`, optional
:param width: Width of the canvas on screen (Pixels), defaults to 640.
:type width: `int`, optional
:param title: Title of the plot. Gets displayed above canvas, defaults to ''.
:type title: `str`, optional
:param caption: Caption (subtitle) of the plot. Gets displayed below the canvas, defaults to ''.
:type caption: `str`, optional
:param grid: Whether a grid should be displayed in the plot, defaults to `True`.
:type grid: `bool`, optional
"""
def __init__(self, height=360, width=640, title='', caption='', grid=True):
# Create a new independent scene
self.scene = canvas()
# Apply the settings
self.scene.background = color.white
self.scene.width = width
self.scene.height = height
self.scene.autoscale = False
# Disable default controls
self.scene.userpan = False # Remove shift+mouse panning (not very good controls)
self.scene.userzoom = True # Keep zoom controls (scrollwheel)
self.scene.userspin = True # Keep ctrl+mouse enabled to rotate (keyboard rotation more tedious)
# Apply HTML title/caption
if title != '':
self.scene.title = title
self.__default_caption = caption
if caption != '':
self.scene.caption = caption
# List of robots currently in the scene
self.__robots = []
self.__selected_robot = 0
# List of joint sliders per robot
self.__teachpanel = [] # 3D, robot -> joint -> options
self.__teachpanel_sliders = []
self.__idx_qlim_min, self.__idx_qlim_max, self.__idx_theta = 0, 1, 2
# Checkbox states
self.__grid_visibility = grid
self.__camera_lock = False
self.__grid_relative = True
# Create the UI
self.__ui_mode = UImode.CANVASCONTROL
self.__toggle_button = None
self.__toggle_button_text_dict = {
UImode.CANVASCONTROL: "Canvas Controls",
UImode.TEACHPANEL: "Robot Controls"
}
self.__ui_controls = self.__setup_ui_controls([])
# Indices to easily identify entities
self.__idx_btn_reset = 0 # Camera Reset Button
self.__idx_menu_robots = 1 # Menu box
self.__idx_chkbox_ref = 2 # Reference Visibility Checkbox
self.__idx_chkbox_rob = 3 # Robot Visibility Checkbox
self.__idx_chkbox_grid = 4 # Grid Visibility Checkbox
self.__idx_chkbox_cam = 5 # Camera Lock Checkbox
self.__idx_chkbox_rel = 6 # Grid Relative Checkbox
self.__idx_sld_opc = 7 # Opacity Slider
self.__idx_btn_del = 8 # Delete button
self.__idx_btn_clr = 9 # Clear button
# Rotate the camera
convert_grid_to_z_up(self.scene)
# Any time a key or mouse is held down, run the callback function
rate(30) # 30Hz
self.scene.bind('keydown', self.__handle_keyboard_inputs)
# Create the grid, and display if wanted
self.__graphics_grid = GraphicsGrid(self.scene)
if not self.__grid_visibility:
self.__graphics_grid.set_visibility(False)
#######################################
# Canvas Management
#######################################
def clear_scene(self):
"""
This function will clear the screen of all objects
"""
# self.__graphics_grid.clear_scene()
# Set all robots variables as invisible
for robot in self.__robots:
robot.set_reference_visibility(False)
robot.set_robot_visibility(False)
self.scene.waitfor("draw_complete")
new_list = []
for name in self.__ui_controls[self.__idx_menu_robots].choices:
new_list.append(name)
self.__selected_robot = 0
self.__reload_caption(new_list)
def grid_visibility(self, is_visible):
"""
Update the grid visibility in the scene
:param is_visible: Whether the grid should be visible or not
:type is_visible: `bool`
"""
self.__graphics_grid.set_visibility(is_visible)
def add_robot(self, robot):
"""
This function is called when a new robot is created. It adds it to the drop down menu.
:param robot: A graphical robot to add to the scene
:type robot: class:`graphics.graphics_robot.GraphicalRobot`
"""
# ALTHOUGH THE DOCUMENTATION SAYS THAT MENU CHOICES CAN BE UPDATED,
# THE PACKAGE DOES NOT ALLOW IT.
# THUS THIS 'HACK' MUST BE DONE TO REFRESH THE UI WITH AN UPDATED LIST
# Save the list of robot names
new_list = []
for name in self.__ui_controls[self.__idx_menu_robots].choices:
new_list.append(name)
# Add the new one
new_list.append(robot.name)
# Add robot to list
self.__robots.append(robot)
self.__selected_robot = len(self.__robots) - 1
num_options = 3
self.__teachpanel.append([[0] * num_options] * robot.num_joints) # Add spot for current robot settings
# Add robot joint sliders
i = 0
for joint in robot.joints:
self.__teachpanel[self.__selected_robot][i] = [joint.qlim[0], joint.qlim[1], joint.theta]
i += 1
# Refresh the caption
self.__reload_caption(new_list)
# Set it as selected
self.__ui_controls[self.__idx_menu_robots].index = len(self.__robots) - 1
#######################################
# UI Management
#######################################
def __add_mode_button(self):
"""
Adds a button to the UI that toggles the UI mode
:returns: A button
:rtype: class:`vpython.button`
"""
btn_text = self.__toggle_button_text_dict.get(self.__ui_mode, "Unknown Mode Set")
self.scene.append_to_caption('\n')
btn_toggle = button(bind=self.__toggle_mode, text=btn_text)
self.scene.append_to_caption('\n\n')
return btn_toggle
def __del_robot(self):
"""
Remove a robot from the scene and the UI controls
"""
if len(self.__robots) == 0:
# Alert the user and return
self.scene.append_to_caption('<script type="text/javascript">alert("No robot to delete");</script>')
return
# Clear the robot visuals
self.__robots[self.__selected_robot].set_reference_visibility(False)
self.__robots[self.__selected_robot].set_robot_visibility(False)
# Remove from UI
new_list = []
for name in self.__ui_controls[self.__idx_menu_robots].choices:
new_list.append(name)
del new_list[self.__selected_robot]
del self.__robots[self.__selected_robot]
del self.__teachpanel[self.__selected_robot]
self.__selected_robot = 0
# Update UI
self.__reload_caption(new_list)
# Select the top item
if len(self.__ui_controls[self.__idx_menu_robots].choices) > 0:
self.__ui_controls[self.__idx_menu_robots].index = 0
def __handle_keyboard_inputs(self):
"""
Pans amount dependent on distance between camera and focus point.
Closer = smaller pan amount
A = move left (pan)
D = move right (pan)
W = move forward (pan)
S = move backward (pan)
<- = rotate left along camera axes (rotate)
-> = rotate right along camera axes (rotate)
^ = rotate up along camera axes (rotate)
V = rotate down along camera axes (rotate)
Q = roll left (rotate)
E = roll right (rotate)
space = move up (pan)
shift = move down (pan)
ctrl + LMB = rotate (Default Vpython)
"""
# If camera lock, just skip the function
if self.__camera_lock:
return
# Constants
pan_amount = 0.02 # units
rot_amount = 1.0 # deg
# Current settings
cam_distance = self.scene.camera.axis.mag
cam_pos = vector(self.scene.camera.pos)
cam_focus = vector(self.scene.center)
# Weird manipulation to get correct vector directions. (scene.camera.up always defaults to world up)
cam_axis = (vector(self.scene.camera.axis)) # X
cam_side_axis = self.scene.camera.up.cross(cam_axis) # Y
cam_up = cam_axis.cross(cam_side_axis) # Z
cam_up.mag = cam_axis.mag
# Get a list of keys
keys = keysdown()
# Userspin uses ctrl, so skip this check to avoid changing camera pose while ctrl is held
if 'ctrl' in keys:
return
################################################################################################################
# PANNING
# Check if the keys are pressed, update vectors as required
# Changing camera position updates the scene center to follow same changes
if 'w' in keys:
cam_pos = cam_pos + cam_axis * pan_amount
if 's' in keys:
cam_pos = cam_pos - cam_axis * pan_amount
if 'a' in keys:
cam_pos = cam_pos + cam_side_axis * pan_amount
if 'd' in keys:
cam_pos = cam_pos - cam_side_axis * pan_amount
if ' ' in keys:
cam_pos = cam_pos + cam_up * pan_amount
if 'shift' in keys:
cam_pos = cam_pos - cam_up * pan_amount
# Update camera position before rotation (to keep pan and rotate separate)
self.scene.camera.pos = cam_pos
################################################################################################################
# Camera Roll
# If only one rotation key is pressed
if 'q' in keys and 'e' not in keys:
# Rotate camera up
cam_up = cam_up.rotate(angle=-radians(rot_amount), axis=cam_axis)
# Set magnitude as it went to inf
cam_up.mag = cam_axis.mag
# Set
self.scene.up = cam_up
# If only one rotation key is pressed
if 'e' in keys and 'q' not in keys:
# Rotate camera up
cam_up = cam_up.rotate(angle=radians(rot_amount), axis=cam_axis)
# Set magnitude as it went to inf
cam_up.mag = cam_axis.mag
# Set
self.scene.up = cam_up
################################################################################################################
# CAMERA ROTATION
d = cam_distance
move_dist = sqrt(d ** 2 + d ** 2 - 2 * d * d * cos(radians(rot_amount))) # SAS Cosine
# If only left not right key
if 'left' in keys and 'right' not in keys:
# Calculate distance to translate
cam_pos = cam_pos + norm(cam_side_axis) * move_dist
# Calculate new camera axis
cam_axis = -(cam_pos - cam_focus)
if 'right' in keys and 'left' not in keys:
cam_pos = cam_pos - norm(cam_side_axis) * move_dist
cam_axis = -(cam_pos - cam_focus)
if 'up' in keys and 'down' not in keys:
cam_pos = cam_pos + norm(cam_up) * move_dist
cam_axis = -(cam_pos - cam_focus)
if 'down' in keys and 'up' not in keys:
cam_pos = cam_pos - norm(cam_up) * move_dist
cam_axis = -(cam_pos - cam_focus)
# Update camera position and axis
self.scene.camera.pos = cam_pos
self.scene.camera.axis = cam_axis
def __reload_caption(self, new_list):
"""
Reload the UI with the new list of robot names
"""
# Remove all UI elements
for item in self.__ui_controls:
item.delete()
for item in self.__teachpanel_sliders:
item.delete()
self.__teachpanel_sliders = []
# Restore the caption
self.scene.caption = self.__default_caption
# Create the updated caption.
self.__toggle_button = self.__add_mode_button()
self.__load_mode_ui(new_list)
def __load_mode_ui(self, new_list):
"""
"""
if self.__ui_mode == UImode.CANVASCONTROL:
self.__ui_controls = self.__setup_ui_controls(new_list)
elif self.__ui_mode == UImode.TEACHPANEL:
self.__setup_joint_sliders()
else:
self.scene.append_to_caption("UNKNOWN MODE ENTERED\n")
def __setup_ui_controls(self, list_of_names):
"""
The initial configuration of the user interface
:param list_of_names: A list of names of the robots in the screen
:type list_of_names: `list`
"""
# Button to reset camera
btn_reset = button(bind=self.__reset_camera, text="Reset Camera")
self.scene.append_to_caption('\t')
chkbox_cam = checkbox(bind=self.__camera_lock_checkbox, text="Camera Lock", checked=self.__camera_lock)
self.scene.append_to_caption('\t')
chkbox_rel = checkbox(bind=self.__grid_relative_checkbox, text="Grid Relative", checked=self.__grid_relative)
self.scene.append_to_caption('\n\n')
# Drop down for robots / joints in frame
menu_robots = menu(bind=self.__menu_item_chosen, choices=list_of_names)
if not len(list_of_names) == 0:
menu_robots.index = self.__selected_robot
self.scene.append_to_caption('\t')
# Button to delete the selected robot
btn_del = button(bind=self.__del_robot, text="Delete Robot")
self.scene.append_to_caption('\t')
# Button to clear the robots in screen
btn_clr = button(bind=self.clear_scene, text="Clear Scene")
self.scene.append_to_caption('\n\n')
# Checkbox for grid visibility
chkbox_grid = checkbox(bind=self.__grid_visibility_checkbox, text="Grid Visibility",
checked=self.__grid_visibility)
self.scene.append_to_caption('\t')
# Checkbox for reference frame visibilities
if len(self.__robots) == 0:
chkbox_ref = checkbox(bind=self.__reference_frame_checkbox, text="Show Reference Frames", checked=True)
else:
chk = self.__robots[self.__selected_robot].ref_shown
chkbox_ref = checkbox(bind=self.__reference_frame_checkbox, text="Show Reference Frames", checked=chk)
self.scene.append_to_caption('\t')
# Checkbox for robot visibility
if len(self.__robots) == 0:
chkbox_rob = checkbox(bind=self.__robot_visibility_checkbox, text="Show Robot", checked=True)
else:
chk = self.__robots[self.__selected_robot].rob_shown
chkbox_rob = checkbox(bind=self.__robot_visibility_checkbox, text="Show Robot", checked=chk)
self.scene.append_to_caption('\n\n')
# Slider for robot opacity
self.scene.append_to_caption('Opacity:')
if len(self.__robots) == 0:
sld_opc = slider(bind=self.__opacity_slider, value=1)
else:
opc = self.__robots[self.__selected_robot].opacity
sld_opc = slider(bind=self.__opacity_slider, value=opc)
# self.scene.append_to_caption('\n\n')
# Prevent the space bar from toggling the active checkbox/button/etc (default browser behaviour)
self.scene.append_to_caption('''
<script type="text/javascript">
$(document).keyup(function(event) {
if(event.which === 32) {
event.preventDefault();
}
});
</script>''')
# https://stackoverflow.com/questions/22280139/prevent-space-button-from-triggering-any-other-button-click-in-jquery
# Control manual
controls_str = '<br><b>Controls</b><br>' \
'<b>PAN</b><br>' \
'W , S | <i>forward / backward</i><br>' \
'A , D | <i>left / right</i><br>' \
'SPACE , SHIFT | <i>up / down</i><br>' \
'<b>ROTATE</b><br>' \
'CTRL + LMB | <i>free spin</i><br>' \
'ARROWS KEYS | <i>rotate direction</i><br>' \
'Q , E | <i>roll left / right</i><br>' \
'<b>ZOOM</b></br>' \
'MOUSEWHEEL | <i>zoom in / out</i><br>' \
'<script type="text/javascript">var arrow_keys_handler = function(e) {switch(e.keyCode){ case 37: case 39: case 38: case 40: case 32: e.preventDefault(); break; default: break;}};window.addEventListener("keydown", arrow_keys_handler, false);</script>'
# Disable the arrow keys from scrolling in the browser
# https://stackoverflow.com/questions/8916620/disable-arrow-key-scrolling-in-users-browser
self.scene.append_to_caption(controls_str)
return [btn_reset, menu_robots, chkbox_ref, chkbox_rob, chkbox_grid, chkbox_cam, chkbox_rel, sld_opc, btn_del,
btn_clr]
def __setup_joint_sliders(self):
"""
Display the Teachpanel mode of the UI
"""
i = 1
for joint in self.__teachpanel[self.__selected_robot]:
# Add a title
self.scene.append_to_caption('Joint {0}:\t'.format(i))
i += 1
# Add the slider, with the correct joint variables
s = slider(
bind=self.__joint_slider,
min=joint[self.__idx_qlim_min],
max=joint[self.__idx_qlim_max],
value=joint[self.__idx_theta]
)
self.__teachpanel_sliders.append(s)
self.scene.append_to_caption('\n\n')
#######################################
# UI CALLBACKS
#######################################
def __toggle_mode(self):
"""
Callback for when the toggle mode button is pressed
"""
# Update mode
self.__ui_mode = {
UImode.CANVASCONTROL: UImode.TEACHPANEL,
UImode.TEACHPANEL: UImode.CANVASCONTROL
}.get(self.__ui_mode, UImode.CANVASCONTROL) # Update mode, default canvas controls
# Update UI
# get list of robots
new_list = []
for name in self.__ui_controls[self.__idx_menu_robots].choices:
new_list.append(name)
self.__reload_caption(new_list)
def __reset_camera(self):
"""
Reset the camera to a default position and orientation
"""
# Reset Camera
self.scene.up = z_axis_vector
self.scene.camera.pos = vector(10, 10, 10)
self.scene.camera.axis = -self.scene.camera.pos
# Update grid
self.__graphics_grid.update_grid()
def __menu_item_chosen(self, m):
"""
When a menu item is chosen, update the relevant checkboxes/options
:param m: The menu object that has been used to select an item.
:type: class:`menu`
"""
# Get selected item
self.__selected_robot = m.index
# Update the checkboxes/sliders for the selected robot
self.__ui_controls[self.__idx_chkbox_ref].checked = \
self.__robots[self.__selected_robot].ref_shown
self.__ui_controls[self.__idx_chkbox_rob].checked = \
self.__robots[self.__selected_robot].rob_shown
self.__ui_controls[self.__idx_sld_opc].value = \
self.__robots[self.__selected_robot].opacity
def __reference_frame_checkbox(self, c):
"""
When a checkbox is changed for the reference frame option, update the graphics
:param c: The checkbox that has been toggled
:type c: class:`checkbox`
"""
if len(self.__robots) > 0:
self.__robots[self.__selected_robot].set_reference_visibility(c.checked)
def __robot_visibility_checkbox(self, c):
"""
When a checkbox is changed for the robot visibility, update the graphics
:param c: The checkbox that has been toggled
:type c: class:`checkbox`
"""
if len(self.__robots) > 0:
self.__robots[self.__selected_robot].set_robot_visibility(c.checked)
def __grid_visibility_checkbox(self, c):
"""
When a checkbox is changed for the grid visibility, update the graphics
:param c: The checkbox that has been toggled
:type c: class:`checkbox`
"""
self.grid_visibility(c.checked)
self.__grid_visibility = c.checked
def __camera_lock_checkbox(self, c):
"""
When a checkbox is changed for the camera lock, update the camera
:param c: The checkbox that has been toggled
:type c: class:`checkbox`
"""
# Update parameters
# True = locked
self.__camera_lock = c.checked
# True = enabled
self.scene.userspin = not c.checked
self.scene.userzoom = not c.checked
def __grid_relative_checkbox(self, c):
"""
When a checkbox is changed for the grid lock, update the grid
:param c: The checkbox that has been toggled
:type c: class:`checkbox`
"""
self.__graphics_grid.set_relative(c.checked)
self.__grid_relative = c.checked
def __opacity_slider(self, s):
"""
Update the opacity slider depending on the slider value
:param s: The slider object that has been modified
:type s: class:`slider`
"""
if len(self.__robots) > 0:
self.__robots[self.__selected_robot].set_transparency(s.value)
def __joint_slider(self, s):
"""
The callback for when a joint slider has changed value
:param s: The slider object that has been modified
:type s: class:`slider`
"""
# Save the values for updating later
for slider_num in range(0, len(self.__teachpanel_sliders)):
self.__teachpanel[self.__selected_robot][slider_num][self.__idx_theta] = \
self.__teachpanel_sliders[slider_num].value
# Get all angles for the robot
angles = []
for joint_slider in self.__teachpanel_sliders:
angles.append(joint_slider.value)
# Run fkine
poses = self.__robots[self.__selected_robot].fkine(angles)
poses = poses[1:len(poses)] # Ignore the first item
# Update joints
self.__robots[self.__selected_robot].set_joint_poses(poses)
class GraphicsCanvas2D:
"""
Set up the scene with initial conditions.
- White background
- Width, height
- Title, caption
- Axes drawn (if applicable)
:param height: Height of the canvas on screen (Pixels), defaults to 500.
:type height: `int`, optional
:param width: Width of the canvas on screen (Pixels), defaults to 1000.
:type width: `int`, optional
:param title: Title of the plot. Gets displayed above canvas, defaults to ''.
:type title: `str`, optional
:param caption: Caption (subtitle) of the plot. Gets displayed below the canvas, defaults to ''.
:type caption: `str`, optional
:param grid: Whether a grid should be displayed in the plot, defaults to `True`.
:type grid: `bool`, optional
"""
def __init__(self,
height=500,
width=1000,
title='',
caption='',
grid=True):
# Private lists
self.__line_styles = [
'', # None
'-', # Solid (default)
'--', # Dashes
':', # Dotted
'-.', # Dash-dot
]
self.__marker_styles = [
'+', # Plus
'o', # Circle
'*', # Star
'.', # Dot
'x', # Cross
's', # Square
'd', # Diamond
'^', # Up triangle
'v', # Down triangle
'<', # Left triangle
'>', # Right triangle
'p', # Pentagon
'h', # Hexagon
]
self.__colour_styles = [
'r', # Red
'g', # Green
'b', # Blue
'y', # Yellow
'c', # Cyan
'm', # Magenta
'k', # Black (default)
'w', # White
]
self.__colour_dictionary = {
'r': color.red.value,
'g': color.green.value,
'b': color.blue.value,
'c': color.cyan.value,
'y': color.yellow.value,
'm': color.magenta.value,
'k': color.black.value,
'w': color.white.value
}
# Create a new independent scene
self.scene = canvas()
# Apply the settings
self.scene.background = color.white
self.scene.width = width
self.scene.height = height
self.scene.autoscale = False
# Disable default controls
self.scene.userpan = True # Keep shift+mouse panning (key overwritten)
self.scene.userzoom = True # Keep zoom controls (scrollwheel)
self.scene.userspin = False # Remove ctrl+mouse enabled to rotate
self.__grid_visibility = grid
self.__camera_lock = False
# Apply HTML title/caption
if title != '':
self.scene.title = title
self.__default_caption = caption
if caption != '':
self.scene.caption = caption
# Rotate the camera
# convert_grid_to_z_up(self.scene)
# Any time a key or mouse is held down, run the callback function
rate(30) # 30Hz
self.scene.bind('keydown', self.__handle_keyboard_inputs)
# Create the grid, and display if wanted
self.__graphics_grid = GraphicsGrid(self.scene)
# Toggle grid to 2D
self.__graphics_grid.toggle_2d_3d()
# Lock the grid
self.__graphics_grid.set_relative(False)
# Turn off grid if applicable
if not self.__grid_visibility:
self.__graphics_grid.set_visibility(False)
# Reset the camera to known spot
self.__reset_camera()
self.__graphics_grid.update_grid()
#######################################
# Canvas Management
#######################################
# TODO
def clear_scene(self):
pass
def grid_visibility(self, is_visible):
"""
Update the grid visibility in the scene
:param is_visible: Whether the grid should be visible or not
:type is_visible: `bool`
"""
self.__graphics_grid.set_visibility(is_visible)
#######################################
# UI Management
#######################################
# TODO
def __setup_ui_controls(self):
pass
def __handle_keyboard_inputs(self):
"""
Pans amount dependent on distance between camera and focus point.
Closer = smaller pan amount
A = move left (pan)
D = move right (pan)
W = move up (pan)
S = move down (pan)
<- = rotate left along camera axes (rotate)
-> = rotate right along camera axes (rotate)
^ = rotate up along camera axes (rotate)
V = rotate down along camera axes (rotate)
Q = roll left (rotate)
E = roll right (rotate)
ctrl + LMB = rotate (Default Vpython)
"""
# If camera lock, just skip the function
if self.__camera_lock:
return
# Constants
pan_amount = 0.02 # units
rot_amount = 1.0 # deg
# Current settings
cam_distance = self.scene.camera.axis.mag
cam_pos = vector(self.scene.camera.pos)
cam_focus = vector(self.scene.center)
# Weird manipulation to get correct vector directions. (scene.camera.up always defaults to world up)
cam_axis = (vector(self.scene.camera.axis)) # X
cam_side_axis = self.scene.camera.up.cross(cam_axis) # Y
cam_up = cam_axis.cross(cam_side_axis) # Z
cam_up.mag = cam_axis.mag
# Get a list of keys
keys = keysdown()
# Userpan uses ctrl, so skip this check to avoid changing camera pose while shift is held
if 'shift' in keys:
return
################################################################################################################
# PANNING
# Check if the keys are pressed, update vectors as required
# Changing camera position updates the scene center to follow same changes
if 'w' in keys:
cam_pos = cam_pos + cam_up * pan_amount
if 's' in keys:
cam_pos = cam_pos - cam_up * pan_amount
if 'a' in keys:
cam_pos = cam_pos + cam_side_axis * pan_amount
if 'd' in keys:
cam_pos = cam_pos - cam_side_axis * pan_amount
# Update camera position before rotation (to keep pan and rotate separate)
self.scene.camera.pos = cam_pos
################################################################################################################
# Camera Roll
# If only one rotation key is pressed
if 'q' in keys and 'e' not in keys:
# Rotate camera up
cam_up = cam_up.rotate(angle=-radians(rot_amount), axis=cam_axis)
# Set magnitude as it went to inf
cam_up.mag = cam_axis.mag
# Set
self.scene.up = cam_up
# If only one rotation key is pressed
if 'e' in keys and 'q' not in keys:
# Rotate camera up
cam_up = cam_up.rotate(angle=radians(rot_amount), axis=cam_axis)
# Set magnitude as it went to inf
cam_up.mag = cam_axis.mag
# Set
self.scene.up = cam_up
################################################################################################################
# CAMERA ROTATION
d = cam_distance
move_dist = sqrt(d**2 + d**2 -
2 * d * d * cos(radians(rot_amount))) # SAS Cosine
# If only left not right key
if 'left' in keys and 'right' not in keys:
# Calculate distance to translate
cam_pos = cam_pos + norm(cam_side_axis) * move_dist
# Calculate new camera axis
cam_axis = -(cam_pos - cam_focus)
if 'right' in keys and 'left' not in keys:
cam_pos = cam_pos - norm(cam_side_axis) * move_dist
cam_axis = -(cam_pos - cam_focus)
if 'up' in keys and 'down' not in keys:
cam_pos = cam_pos + norm(cam_up) * move_dist
cam_axis = -(cam_pos - cam_focus)
if 'down' in keys and 'up' not in keys:
cam_pos = cam_pos - norm(cam_up) * move_dist
cam_axis = -(cam_pos - cam_focus)
# Update camera position and axis
self.scene.camera.pos = cam_pos
self.scene.camera.axis = cam_axis
def __reset_camera(self):
"""
Reset the camera to a known position
"""
# Reset Camera
self.scene.camera.pos = vector(5, 5, 12) # Hover above (5, 5, 0)
# Ever so slightly off focus, to ensure grid is rendered in the right region
# (if directly at, draws numbers wrong spots)
self.scene.camera.axis = vector(-0.001, -0.001,
-12) # Focus on (5, 5, 0)
self.scene.up = y_axis_vector
#######################################
# Drawing Functions
#######################################
def __draw_path(self,
x_path,
y_path,
opt_line,
opt_marker,
opt_colour,
thickness=0.05):
"""
Draw a line from point to point in the 2D path
:param x_path: The x path to draw on the canvas
:type x_path: `list`
:param y_path: The y path to draw on the canvas
:type y_path: `list`
:param opt_line: The line option argument
:type opt_line: `str`
:param opt_marker: The marker option argument
:type opt_marker: `str`
:param opt_colour: The colour option argument
:type opt_colour: `str`
:param thickness: Thickness of the line
:type thickness: `float`
:raises ValueError: Invalid line type given
"""
# Get colour
colour = self.__get_colour_from_string(opt_colour)
# For every point in the list, draw a line to the next one (excluding last point)
for point in range(0, len(x_path)):
# Get point 1
x1 = x_path[point]
y1 = y_path[point]
p1 = vector(x1, y1, 0)
# If at end / only coordinate - draw a marker
if point == len(x_path) - 1:
create_marker(self.scene, x1, y1, opt_marker, colour)
return
# Get point 2
x2 = x_path[point + 1]
y2 = y_path[point + 1]
p2 = vector(x2, y2, 0)
if opt_line == '':
# Only one marker to avoid double-ups
create_marker(self.scene, x1, y1, opt_marker, colour)
elif opt_line == '-':
create_line(p1,
p2,
self.scene,
colour=colour,
thickness=thickness)
# Only one marker to avoid double-ups
create_marker(self.scene, x1, y1, opt_marker, colour)
elif opt_line == '--':
create_segmented_line(p1,
p2,
self.scene,
0.3,
colour=colour,
thickness=thickness)
# Only one marker to avoid double-ups
create_marker(self.scene, x1, y1, opt_marker, colour)
elif opt_line == ':':
create_segmented_line(p1,
p2,
self.scene,
0.05,
colour=colour,
thickness=thickness)
# Only one marker to avoid double-ups
create_marker(self.scene, x1, y1, opt_marker, colour)
elif opt_line == '-.':
raise NotImplementedError("Other line types not implemented")
else:
raise ValueError("Invalid line type given")
def plot(self, x_coords, y_coords=None, options=''):
"""
Same usage as MATLAB's plot.
If given one list of coordinates, plots against index
If given two lists of coordinates, plots both (1st = x, 2nd = y)
Options string is identical to MATLAB's input string
If you do not specify a marker type, plot uses no marker.
If you do not specify a line style, plot uses a solid line.
b blue . point - solid
g green o circle : dotted
r red x x-mark -. dashdot
c cyan + plus -- dashed
m magenta * star (none) no line
y yellow s square
k black d diamond
w white v triangle (down)
^ triangle (up)
< triangle (left)
> triangle (right)
p pentagram
h hexagram
:param x_coords: The first plane of coordinates to plot
:type x_coords: `list`
:param y_coords: The second plane of coordinates to plot with.
:type y_coords: `list`, `str`, optional
:param options: A string of options to plot with
:type options: `str`, optional
:raises ValueError: Number of X and Y coordinates must be equal
"""
# TODO
# add options for line width, marker size
# If y-vector is str, then only x vector given
if isinstance(y_coords, str):
options = y_coords
y_coords = None
one_set_data = False
# Set y-vector to default if None
if y_coords is None:
one_set_data = True
y_coords = [*range(0, len(x_coords))]
# Verify x, y coords have same length
if len(x_coords) != len(y_coords):
raise ValueError(
"Number of X coordinates does not equal number of Y coordinates."
)
# Verify options given (and save settings to be applied)
verified_options = self.__verify_plot_options(options)
if one_set_data:
# Draw plot for one list of data
self.__draw_path(
y_coords, # Y is default x-coords in one data set
x_coords, # User input
verified_options[0], # Line
verified_options[1], # Marker
verified_options[2], # Colour
)
else:
# Draw plot for two lists of data
self.__draw_path(
x_coords, # User input
y_coords, # User input
verified_options[0], # Line
verified_options[1], # Marker
verified_options[2], # Colour
)
def __verify_plot_options(self, options_str):
"""
Verify that the given options are usable.
:param options_str: The given options from the plot command to verify user input
:type options_str: `str`
:raises ValueError: Unknown character entered
:raises ValueError: Too many line segments used
:raises ValueError: Too many marker segments used
:raises ValueError: Too many colour segments used
:returns: List of options to plot with
:rtype: `list`
"""
default_line = '-'
default_marker = ''
default_colour = 'k'
# Split str into chars list
options_split = list(options_str)
# If 0, set defaults and return early
if len(options_split) == 0:
return [default_line, default_marker, default_colour]
# If line_style given, join the first two options if applicable (some types have 2 characters)
for char in range(0, len(options_split) - 1):
# If char is '-' (only leading character in double length option)
if options_split[char] == '-' and len(options_split) > 1:
# If one of the leading characters is valid
if options_split[char + 1] == '-' or options_split[char +
1] == '.':
# Join the two into the first
options_split[char] = options_split[char] + options_split[
char + 1]
# Shuffle down the rest
for idx in range(char + 2, len(options_split)):
options_split[idx - 1] = options_split[idx]
# Remove duplicate extra
options_split.pop()
# If any unknown, throw error
for option in options_split:
if option not in self.__line_styles and \
option not in self.__marker_styles and \
option not in self.__colour_styles:
error_string = "Unknown character entered: '{0}'"
raise ValueError(error_string.format(option))
##############################
# Verify Line Style
##############################
line_style_count = 0 # Count of options used
line_style_index = 0 # Index position of index used (only used when count == 1)
for option in options_split:
if option in self.__line_styles:
line_style_count = line_style_count + 1
line_style_index = self.__line_styles.index(option)
# If more than one, throw error
if line_style_count > 1:
raise ValueError(
"Too many line style arguments given. Only one allowed")
# If none, set as solid
elif line_style_count == 0 or not any(item in options_split
for item in self.__line_styles):
output_line = default_line
# If one, set as given
else:
output_line = self.__line_styles[line_style_index]
##############################
##############################
# Verify Marker Style
##############################
marker_style_count = 0 # Count of options used
marker_style_index = 0 # Index position of index used (only used when count == 1)
for option in options_split:
if option in self.__marker_styles:
marker_style_count = marker_style_count + 1
marker_style_index = self.__marker_styles.index(option)
# If more than one, throw error
if marker_style_count > 1:
raise ValueError(
"Too many marker style arguments given. Only one allowed")
# If none, set as no-marker
elif marker_style_count == 0 or not any(
item in options_split for item in self.__marker_styles):
output_marker = default_marker
# If one, set as given
else:
output_marker = self.__marker_styles[marker_style_index]
# If marker set and no line given, turn line to no-line
if line_style_count == 0 or not any(
item in options_split for item in self.__line_styles):
output_line = ''
##############################
##############################
# Verify Colour Style
##############################
colour_style_count = 0 # Count of options used
colour_style_index = 0 # Index position of index used (only used when count == 1)
for option in options_split:
if option in self.__colour_styles:
colour_style_count = colour_style_count + 1
colour_style_index = self.__colour_styles.index(option)
# If more than one, throw error
if colour_style_count > 1:
raise ValueError(
"Too many colour style arguments given. Only one allowed")
# If none, set as black
elif colour_style_count == 0 or not any(
item in options_split for item in self.__colour_styles):
output_colour = default_colour
# If one, set as given
else:
output_colour = self.__colour_styles[colour_style_index]
##############################
return [output_line, output_marker, output_colour]
def __get_colour_from_string(self, colour_string):
"""
Using the colour plot string input, return an rgb array of the colour selected
:param colour_string: The colour string option
:type colour_string: `str`
:returns: List of RGB values for the representative colour
:rtype: `list`
"""
# Return the RGB list (black if not in dictionary)
return self.__colour_dictionary.get(colour_string, color.black.value)