class Diagram(object):
- def __init__(self, width, height, background=[1, 1, 1]):
+ def __init__(self, width, height, background=[1, 1, 1], font_size=20):
self.width = width
self.height = height
self.background = background
cr.select_font_face("Georgia", cairo.FONT_SLANT_NORMAL,
cairo.FONT_WEIGHT_NORMAL)
- cr.set_font_size(20)
+ cr.set_font_size(font_size)
# Adjust the font matrix to left-bottom origin
M = cr.get_font_matrix()
else:
return None
- def draw_polygon(self, verts, stroke_color=[0, 0, 0], fill_color=None):
+ def _draw_polygon(self, verts):
cr = self.cr
- if fill_color:
- v = verts[0]
- cr.move_to(v[0], v[1])
- for v in verts[1:]:
- cr.line_to(v[0], v[1])
- cr.close_path()
+ v = verts[0]
+ cr.move_to(v[0], v[1])
+ for v in verts[1:]:
+ cr.line_to(v[0], v[1])
+ cr.close_path()
+
+ def draw_polygon_by_verts(self, verts, fill_color=None, stroke_color=[0, 0, 0]):
+ cr = self.cr
+ if fill_color:
+ self._draw_polygon(verts)
r, g, b, a = self.color_to_rgba(fill_color)
cr.set_source_rgba(r, g, b, a)
cr.fill()
- n = len(verts)
- for i in range(0, n):
- v1 = verts[i]
- v2 = verts[(i + 1) % n]
- cr.move_to(v1[0], v1[1])
- cr.line_to(v2[0], v2[1])
+ if stroke_color:
+ self._draw_polygon(verts)
+ r, g, b, a = self.color_to_rgba(stroke_color)
+ cr.set_source_rgba(r, g, b, a)
+ cr.stroke()
- r, g, b, a = self.color_to_rgba(stroke_color)
- cr.set_source_rgba(r, g, b, a)
- cr.stroke()
+ def draw_polygon(self, cx, cy, sides, r, theta=0.0, fill_color=None, stroke_color=[0, 0, 0]):
+ verts = self.get_regular_polygon(cx, cy, sides, r, theta)
+ self.draw_polygon_by_verts(verts, fill_color, stroke_color)
+ return verts
- def draw_star(self, cx, cy, verts, stroke_color=[0, 0, 0]):
+ def draw_star_by_verts(self, cx, cy, verts, stroke_color=[0, 0, 0]):
cr = self.cr
- v = verts[0]
- cr.move_to(cx, cy)
for v in verts:
- cr.line_to(v[0], v[1])
cr.move_to(cx, cy)
+ cr.line_to(v[0], v[1])
r, g, b, a = self.color_to_rgba(stroke_color)
cr.set_source_rgba(r, g, b, a)
cr.stroke()
- def draw_dot(self, cx, cy, size=10.0, fill_color=[0, 0, 0, 0.5]):
+ def draw_star(self, cx, cy, sides, r, theta=0.0, stroke_color=[0, 0, 0]):
+ apothem = r * cos(pi / sides)
+ apothem_angle = theta + pi / sides
+
+ verts = self.get_regular_polygon(cx, cy, sides, apothem, apothem_angle)
+ self.draw_star_by_verts(cx, cy, verts, stroke_color)
+ return verts
+
+ def draw_circle(self, cx, cy, size=10.0, fill_color=[0, 0, 0, 0.5],
+ stroke_color=None):
cr = self.cr
cr.save()
- r, g, b, a = self.color_to_rgba(fill_color)
- cr.set_source_rgba(r, g, b, a)
cr.arc(cx, cy, size, 0, 2 * pi)
- cr.fill()
+
+ if fill_color:
+ r, g, b, a = self.color_to_rgba(fill_color)
+ cr.set_source_rgba(r, g, b, a)
+ cr.fill()
+
+ if stroke_color:
+ r, g, b, a = self.color_to_rgba(stroke_color)
+ cr.set_source_rgba(r, g, b, a)
+ cr.stroke()
+
cr.restore()
def normalized_angle_01(self, theta):
def draw_line(self, x1, y1, x2, y2, stroke_color=[0, 0, 0, 1]):
cr = self.cr
- r, g, b, a = self.color_to_rgba(stroke_color)
- cr.set_source_rgba(r, g, b, a)
cr.move_to(x1, y1)
cr.line_to(x2, y2)
+ r, g, b, a = self.color_to_rgba(stroke_color)
+ cr.set_source_rgba(r, g, b, a)
cr.stroke()
def draw_rect_from_center(self, cx, cy, width, height, theta=0,
- fill=True, fill_color=[1, 1, 1, 0.8],
- stroke=False, stroke_color=[0, 0, 0, 0.5]):
+ fill_color=[1, 1, 1, 0.8], stroke_color=None):
cr = self.cr
+ # the position of the center of a rectangle at (0,0)
mx = width / 2.0
my = height / 2.0
+ # calculate the position of the bottom-left corner after rotating the
+ # rectangle around the center
rx = cx - (mx * cos(theta) - my * sin(theta))
ry = cy - (mx * sin(theta) + my * cos(theta))
- cr.save()
- cr.translate(rx, ry)
- cr.rotate(theta)
-
- if fill:
- cr.rectangle(0, 0, width, height)
- r, g, b, a = self.color_to_rgba(fill_color)
- cr.set_source_rgba(r, g, b, a)
- cr.fill()
-
- if stroke:
- cr.rectangle(0, 0, width, height)
- r, g, b, a = self.color_to_rgba(stroke_color)
- cr.set_source_rgba(r, g, b, a)
- cr.stroke()
- self.draw_dot(0, 0, 3.0, stroke_color)
+ self.draw_rect(rx, ry, width, height, theta, fill_color, stroke_color)
- cr.restore()
-
- def draw_rect(self, x, y, width, height, fill=True, fill_color=[1, 1, 1, 0.8],
- stroke=False, stroke_color=[0, 0, 0, 0.5]):
+ def draw_rect(self, x, y, width, height, theta=0,
+ fill_color=[1, 1, 1, 0.8], stroke_color=None):
cr = self.cr
cr.save()
cr.translate(x, y)
+ cr.rotate(theta)
- if fill:
+ if fill_color:
cr.rectangle(0, 0, width, height)
r, g, b, a = self.color_to_rgba(fill_color)
cr.set_source_rgba(r, g, b, a)
cr.fill()
- if stroke:
+ if stroke_color:
cr.rectangle(0, 0, width, height)
r, g, b, a = self.color_to_rgba(stroke_color)
cr.set_source_rgba(r, g, b, a)
cr.stroke()
- self.draw_dot(0, 0, 3.0, stroke_color)
cr.restore()
- def draw_centered_text(self, cx, cy, text, theta=0, color=[0, 0, 0], bounding_box=False):
+ def draw_centered_text(self, cx, cy, text, theta=0,
+ color=[0, 0, 0],
+ align_baseline=False,
+ bb_fill_color=[1, 1, 1, 0.8],
+ bb_stroke_color=None):
cr = self.cr
x_bearing, y_bearing, width, height, x_advance = cr.text_extents(text)[:5]
ascent, descent = cr.font_extents()[:2]
# The offset of the lower-left corner of the text.
- # NOTE: y is kept on the baseline
tx = width / 2.0 + x_bearing
- ty = 0
+
+ if align_baseline:
+ # When aligning to the baseline it is convenient the make the
+ # bounding box depend on the font vertical extent and not from the
+ # text content.
+ ty = 0
+ bb = [0, -descent, width, ascent]
+ else:
+ ty = height / 2.0 + y_bearing
+ bb = [0, y_bearing, width, height]
# Angles are intended clockwise by the caller, but the trigonometric
# functions below consider angles counter-clockwise
cr.save()
cr.translate(rx, ry)
cr.rotate(theta)
- self.draw_rect(0, -descent, width, ascent, fill_color=[1, 1, 1, 0.8], stroke=bounding_box)
+
+ if bb_fill_color or bb_stroke_color:
+ self.draw_rect(bb[0], bb[1], bb[2], bb[3], 0, bb_fill_color, bb_stroke_color)
+
r, g, b, a = self.color_to_rgba(color)
cr.set_source_rgba(r, g, b, a)
cr.move_to(0, 0)
theta = 0
- advance = diagram.draw_centered_text(x_offset, y, "Ciao", theta, bounding_box=True)
+ advance = diagram.draw_centered_text(x_offset, y, "Ciao", theta, align_baseline=True, bb_stroke_color=[0, 0, 0, 0.5])
x_offset += advance
- advance = diagram.draw_centered_text(x_offset, y, "____", theta + pi / 4, bounding_box=True)
+ advance = diagram.draw_centered_text(x_offset, y, "____", theta + pi / 4, align_baseline=True, bb_stroke_color=[0, 0, 0, 0.5])
x_offset += advance
- advance = diagram.draw_centered_text(x_offset, y, "jxpqdlf", theta + pi / 2, bounding_box=True)
+ advance = diagram.draw_centered_text(x_offset, y, "jxpqdlf", theta + pi / 2, align_baseline=True, bb_stroke_color=[0, 0, 0, 0.5])
x_offset += advance
- advance = diagram.draw_centered_text(x_offset, y, "pppp", theta + 3 * pi / 4, bounding_box=True)
+ advance = diagram.draw_centered_text(x_offset, y, "pppp", theta + 3 * pi / 4, align_baseline=True, bb_stroke_color=[0, 0, 0, 0.5])
x_offset += advance
- advance = diagram.draw_centered_text(x_offset, y, "dddd", theta + pi, bounding_box=True)
+ advance = diagram.draw_centered_text(x_offset, y, "dddd", theta + pi, align_baseline=True, bb_stroke_color=[0, 0, 0, 0.5])
x_offset += advance
- advance = diagram.draw_centered_text(x_offset, y, "Jjjj", theta + 5 * pi / 4, bounding_box=True)
+ advance = diagram.draw_centered_text(x_offset, y, "Jjjj", theta + 5 * pi / 4, align_baseline=True, bb_stroke_color=[0, 0, 0, 0.5])
x_offset += advance
- advance = diagram.draw_centered_text(x_offset, y, "1369", theta + 3 * pi / 2, bounding_box=True)
+ advance = diagram.draw_centered_text(x_offset, y, "1369", theta + 3 * pi / 2, align_baseline=True, bb_stroke_color=[0, 0, 0, 0.5])
x_offset += advance
- advance = diagram.draw_centered_text(x_offset, y, "qqqq", theta + 7 * pi / 4, bounding_box=True)
+ advance = diagram.draw_centered_text(x_offset, y, "qqqq", theta + 7 * pi / 4, align_baseline=True, bb_stroke_color=[0, 0, 0, 0.5])
x_offset += advance
diagram.draw_line(0, y, 400, y, [0, 0, 1, 0.2])
+ diagram.draw_rect(40, 40, 300, 100, stroke_color=[0, 0, 0, 0.8])
+ diagram.draw_rect(40, 40, 300, 100, pi / 30, stroke_color=[0, 0, 0, 0.8])
+
+ diagram.draw_rect(40, 250, 300, 100, stroke_color=[0, 0, 0, 0.8])
+ diagram.draw_rect_from_center(40 + 150, 250 + 50, 300, 100, theta=(pi / 40), stroke_color=[1, 0, 0], fill_color=None)
+
diagram.show()
projects / experiments / RadialSymmetry.git / blobdiff