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aima-python/canvas.py at 034d279b042224ace4a6356e45f11836ec0bcb8a · sofmonk/aima-python · GitHub
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canvas.py
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canvas.py
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from
IPython
.
display
import
HTML
,
display
_canvas
=
"""
<script type="text/javascript" src="./js/canvas.js"></script>
<div>
<canvas id="{0}" width="{1}" height="{2}" style="background:rgba(158, 167, 184, 0.2);" onclick='click_callback(this, event, "{3}")'></canvas>
</div>
<script> var {0}_canvas_object = new Canvas("{0}");</script>
"""
# noqa
class
Canvas
:
"""Inherit from this class to manage the HTML canvas element in jupyter notebooks.
To create an object of this class any_name_xyz = Canvas("any_name_xyz")
The first argument given must be the name of the object being created.
IPython must be able to refernce the variable name that is being passed.
"""
def
__init__
(
self
,
varname
,
id
=
None
,
width
=
800
,
height
=
600
):
""""""
self
.
name
=
varname
self
.
id
=
id
or
varname
self
.
width
=
width
self
.
height
=
height
self
.
html
=
_canvas
.
format
(
self
.
id
,
self
.
width
,
self
.
height
,
self
.
name
)
self
.
exec_list
=
[]
display
(
HTML
(
self
.
html
))
def
mouse_click
(
self
,
x
,
y
):
"Override this method to handle mouse click at position (x, y)"
raise
NotImplementedError
def
mouse_move
(
self
,
x
,
y
):
raise
NotImplementedError
def
execute
(
self
,
exec_str
):
"Stores the command to be exectued to a list which is used later during update()"
if
not
isinstance
(
exec_str
,
str
):
print
(
"Invalid execution argument:"
,
exec_str
)
self
.
alert
(
"Recieved invalid execution command format"
)
prefix
=
"{0}_canvas_object."
.
format
(
self
.
id
)
self
.
exec_list
.
append
(
prefix
+
exec_str
+
';'
)
def
fill
(
self
,
r
,
g
,
b
):
"Changes the fill color to a color in rgb format"
self
.
execute
(
"fill({0}, {1}, {2})"
.
format
(
r
,
g
,
b
))
def
stroke
(
self
,
r
,
g
,
b
):
"Changes the colors of line/strokes to rgb"
self
.
execute
(
"stroke({0}, {1}, {2})"
.
format
(
r
,
g
,
b
))
def
strokeWidth
(
self
,
w
):
"Changes the width of lines/strokes to 'w' pixels"
self
.
execute
(
"strokeWidth({0})"
.
format
(
w
))
def
rect
(
self
,
x
,
y
,
w
,
h
):
"Draw a rectangle with 'w' width, 'h' height and (x, y) as the top-left corner"
self
.
execute
(
"rect({0}, {1}, {2}, {3})"
.
format
(
x
,
y
,
w
,
h
))
def
rect_n
(
self
,
xn
,
yn
,
wn
,
hn
):
"Similar to rect(), but the dimensions are normalized to fall between 0 and 1"
x
=
round
(
xn
*
self
.
width
)
y
=
round
(
yn
*
self
.
height
)
w
=
round
(
wn
*
self
.
width
)
h
=
round
(
hn
*
self
.
height
)
self
.
rect
(
x
,
y
,
w
,
h
)
def
line
(
self
,
x1
,
y1
,
x2
,
y2
):
"Draw a line from (x1, y1) to (x2, y2)"
self
.
execute
(
"line({0}, {1}, {2}, {3})"
.
format
(
x1
,
y1
,
x2
,
y2
))
def
line_n
(
self
,
x1n
,
y1n
,
x2n
,
y2n
):
"Similar to line(), but the dimensions are normalized to fall between 0 and 1"
x1
=
round
(
x1n
*
self
.
width
)
y1
=
round
(
y1n
*
self
.
height
)
x2
=
round
(
x2n
*
self
.
width
)
y2
=
round
(
y2n
*
self
.
height
)
self
.
line
(
x1
,
y1
,
x2
,
y2
)
def
arc
(
self
,
x
,
y
,
r
,
start
,
stop
):
"Draw an arc with (x, y) as centre, 'r' as radius from angles 'start' to 'stop'"
self
.
execute
(
"arc({0}, {1}, {2}, {3}, {4})"
.
format
(
x
,
y
,
r
,
start
,
stop
))
def
arc_n
(
self
,
xn
,
yn
,
rn
,
start
,
stop
):
"""Similar to arc(), but the dimensions are normalized to fall between 0 and 1
The normalizing factor for radius is selected between width and height by
seeing which is smaller
"""
x
=
round
(
xn
*
self
.
width
)
y
=
round
(
yn
*
self
.
height
)
r
=
round
(
rn
*
min
(
self
.
width
,
self
.
height
))
self
.
arc
(
x
,
y
,
r
,
start
,
stop
)
def
clear
(
self
):
"Clear the HTML canvas"
self
.
execute
(
"clear()"
)
def
font
(
self
,
font
):
"Changes the font of text"
self
.
execute
(
'font("{0}")'
.
format
(
font
))
def
text
(
self
,
txt
,
x
,
y
,
fill
=
True
):
"Display a text at (x, y)"
if
fill
:
self
.
execute
(
'fill_text("{0}", {1}, {2})'
.
format
(
txt
,
x
,
y
))
else
:
self
.
execute
(
'stroke_text("{0}", {1}, {2})'
.
format
(
txt
,
x
,
y
))
def
text_n
(
self
,
txt
,
xn
,
yn
,
fill
=
True
):
"Similar to text(), but with normalized coordinates"
x
=
round
(
xn
*
self
.
width
)
y
=
round
(
yn
*
self
.
height
)
self
.
text
(
txt
,
x
,
y
,
fill
)
def
alert
(
self
,
message
):
"Immediately display an alert"
display
(
HTML
(
'<script>alert("{0}")</script>'
.
format
(
message
)))
def
update
(
self
):
"Execute the JS code to execute the commands queued by execute()"
exec_code
=
"<script>
\n
"
+
'
\n
'
.
join
(
self
.
exec_list
)
+
"
\n
</script>"
self
.
exec_list
=
[]
display
(
HTML
(
exec_code
))
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