X-Git-Url: https://git.ao2.it/experiments/RadialSymmetry.git/blobdiff_plain/aad1044b2a0ad5ca47d21f74da7066708b9c584a..c9af9befec0d61da74f67cbbe9f035ae5a486d9d:/Diagram.py diff --git a/Diagram.py b/Diagram.py index 0bc3925..28cb064 100755 --- a/Diagram.py +++ b/Diagram.py @@ -23,7 +23,7 @@ from math import * 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 @@ -38,7 +38,7 @@ class Diagram(object): 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() @@ -97,39 +97,36 @@ class Diagram(object): 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(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]) - - r, g, b, a = self.color_to_rgba(stroke_color) - cr.set_source_rgba(r, g, b, a) - cr.stroke() + 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() def draw_star(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) @@ -139,8 +136,8 @@ class Diagram(object): cr = self.cr cr.save() - cr.set_source_rgba(fill_color[0], fill_color[1], fill_color[2], - fill_color[3]) + 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() cr.restore() @@ -157,63 +154,67 @@ class Diagram(object): cr.stroke() def draw_rect_from_center(self, cx, cy, width, height, theta=0, - fill=True, fill_color=[1, 1, 1], - stroke=False, stroke_color=[0, 0, 0]): + fill=True, fill_color=[1, 1, 1, 0.8], + stroke=False, stroke_color=[0, 0, 0, 0.5]): 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) - cr.set_source_rgba(fill_color[0], fill_color[1], fill_color[2], 0.8) - cr.fill() - - if stroke: - cr.rectangle(0, 0, width, height) - cr.set_source_rgba(stroke_color[0], stroke_color[1], stroke_color[2], 0.5) - cr.stroke() - self.draw_dot(0, 0, 3.0, list(stroke_color) + [0.5]) + self.draw_rect(rx, ry, width, height, theta, fill, fill_color, stroke, + stroke_color) - cr.restore() - - def draw_rect(self, x, y, width, height, fill=True, fill_color=[1, 1, 1], - stroke=False, stroke_color=[0, 0, 0]): + def draw_rect(self, x, y, width, height, theta=0, fill=True, fill_color=[1, 1, 1, 0.8], + stroke=False, stroke_color=[0, 0, 0, 0.5]): cr = self.cr cr.save() cr.translate(x, y) + cr.rotate(theta) if fill: cr.rectangle(0, 0, width, height) - cr.set_source_rgba(fill_color[0], fill_color[1], fill_color[2], 0.8) + 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) - cr.set_source_rgba(stroke_color[0], stroke_color[1], stroke_color[2], 0.5) + 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, list(stroke_color) + [0.5]) + 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=True, bb_fill_color=[1, 1, 1, 0.8], + bb_stroke=False, bb_stroke_color=[0, 0, 0, 0.5]): 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 @@ -226,8 +227,12 @@ class Diagram(object): cr.save() cr.translate(rx, ry) cr.rotate(theta) - self.draw_rect(0, -descent, width, ascent, fill_color=[1, 1, 1, 0.1], stroke=bounding_box) - cr.set_source_rgba(color[0], color[1], color[2], 0.8) + + if bb_fill or bb_stroke: + self.draw_rect(bb[0], bb[1], bb[2], bb[3], 0, bb_fill, bb_fill_color, bb_stroke, 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) cr.show_text(text) cr.fill() @@ -248,30 +253,36 @@ if __name__ == "__main__": 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=True) 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=True) 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=True) 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=True) 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=True) 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=True) 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=True) 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=True) x_offset += advance diagram.draw_line(0, y, 400, y, [0, 0, 1, 0.2]) + diagram.draw_rect(40, 40, 300, 100, stroke=True) + diagram.draw_rect(40, 40, 300, 100, pi / 30, stroke=True) + + diagram.draw_rect(40, 250, 300, 100, stroke=True) + diagram.draw_rect_from_center(40 + 150, 250 + 50, 300, 100, theta=pi / 40, stroke=True, stroke_color=[1, 0, 0], fill=False) + diagram.show()