def __init__(self, title=None):
self.top = self.bottom = self.left = self.right= self.margin
self.canvas = Canvas(self.width, self.height, antialias=self.antialias)
self.title = title
self.x_labels = []
self.y_labels = []
self.x_spacing = 10
self.y_spacing = 10
self.x_max = 10
self.y_max = 10
self.continuous = True
class Plot(object):
margin = 4
line_width = 2
axes_line_width = 2
width = 450
height = 150
background = 'FFFFFF'
show_axes = True
show_grid = True
show_labels = True
show_title = True
antialias = True
def __init__(self, title=None):
self.top = self.bottom = self.left = self.right= self.margin
self.canvas = Canvas(self.width, self.height, antialias=self.antialias)
self.title = title
self.x_labels = []
self.y_labels = []
self.x_spacing = 10
self.y_spacing = 10
self.x_max = 10
self.y_max = 10
self.continuous = True
def write(self, data, file):
if self.show_labels:
self.left = 40
self.bottom = 15
self._adjust_margins(data.x_labels, data.y_labels)
self._setup_canvas_scale(data.x_max, data.y_max)
self._draw_background()
if self.show_grid:
self._draw_grid(data.x_spacing, data.y_spacing, data.x_max, data.y_max)
if self.show_labels:
self._draw_labels(data.x_labels, data.y_labels, data.x_spacing, data.y_spacing)
self.draw(data, width=self.line_width, continuous=data.continuous, color=COLORS['blue'])
if self.show_axes:
self._draw_axes(data.x_max, data.y_max)
if self.show_title:
self._draw_title(self.title, data.x_max, data.y_max)
self.canvas.write(file)
def _draw_background(self):
self.canvas.move(0,0)
self.canvas.rectangle(self.width, self.height, fill=self.background)
def _adjust_margins(self, x_labels, y_labels):
for label in y_labels:
width, height = self.canvas.text_size(label)
if width+2*self.margin > self.left:
self.left = width+2*self.margin
width, height = self.canvas.font_size()
if height+self.margin > self.bottom:
self.bottom = height+self.margin
def _setup_canvas_scale(self, x_max, y_max):
sx = (self.width - self.left - self.right) / float(x_max)
sy = (self.height - self.top - self.bottom) / float(y_max)
tx = self.left
ty = self.height - self.bottom
self.canvas.scale(sx, sy, tx, ty)
self.canvas.restore()
def _draw_axes(self, x_max, y_max, color='BABDB6'):
self.canvas.scale()
self.canvas.move(0, y_max)
self.canvas.line(0, 0)
self.canvas.line(x_max, 0)
self.canvas.restore()
self.canvas.stroke(width=self.axes_line_width, color=color, antialias=False)
def _draw_grid(self, x_spacing, y_spacing, x_max, y_max, color='EEEEEC'):
self.canvas.scale()
y_spacing = int(y_spacing) or 1
for y in xrange(y_spacing, int(y_max), y_spacing):
self.canvas.move(0, y)
self.canvas.line(x_max, y)
x_spacing = int(x_spacing/2) or 1
for x in xrange(x_spacing, int(x_max), x_spacing):
self.canvas.move(x, 0)
self.canvas.line(x, y_max)
self.canvas.restore()
self.canvas.stroke(width=1, dash=[3, 2], color=color, antialias=False)
def _draw_labels(self, x_labels, y_labels, x_spacing, y_spacing, color='555753'):
for i, label in enumerate(x_labels):
self.canvas.scale()
self.canvas.move(i*x_spacing, 0)
self.canvas.restore()
if i == 0:
align = 'left'
self.canvas.move(-self.margin, 0, relative=True)
else:
align = 'center'
self.canvas.text(label, align=align, valign='top', color=color)
for i, label in enumerate(y_labels):
self.canvas.scale()
self.canvas.move(0, i*y_spacing)
self.canvas.restore()
self.canvas.text(label, align='right', valign='middle', color=color)
def _draw_title(self, title, x_max, y_max, color='555753'):
self.canvas.scale()
self.canvas.move(x_max/2, y_max)
self.canvas.restore()
self.canvas.text(title, color=color)
def draw(self, data, color='3465A4', width=2, continuous=True):
self.canvas.scale()
self.canvas.move(0, 0)
for x, y in data:
if not continuous:
self.canvas.move(x, 0)
self.canvas.line(x, y)
self.canvas.restore()
self.canvas.stroke(width=width, color=color)