X-Git-Url: https://git.ao2.it/flexagon-toolkit.git/blobdiff_plain/b0d293a76ed3a595754b643f48b2f2d1b03395f6..6ed0df361ceb82dcd9fb592c910123a2d3a274ed:/src/diagram/diagram.py diff --git a/src/diagram/diagram.py b/src/diagram/diagram.py index eee9fc6..e6c51c4 100755 --- a/src/diagram/diagram.py +++ b/src/diagram/diagram.py @@ -32,6 +32,87 @@ class Diagram(object): raise NotImplementedError @staticmethod + def test(diagram): + diagram.clear() + + x = 40 + y = 200 + + x_offset = x + + theta = 0 + + diagram.draw_line(0, y, 400, y, (1, 0, 0, 1)) + + advance = diagram.draw_centered_text(x_offset, y, "Ciao", theta, + align_baseline=True, + bb_stroke_color=(0, 0, 0, 0.5), + bb_fill_color=(1, 1, 1, 0.8)) + x_offset += advance + + advance = diagram.draw_centered_text(x_offset, y, "____", theta + pi / 4, + align_baseline=True, + bb_stroke_color=(0, 0, 0, 0.5), + bb_fill_color=(1, 1, 1, 0.8)) + x_offset += advance + + advance = diagram.draw_centered_text(x_offset, y, "jxpqdlf", theta + pi / 2, + align_baseline=True, + bb_stroke_color=(0, 0, 0, 0.5), + bb_fill_color=(1, 1, 1, 0.8)) + x_offset += advance + + advance = diagram.draw_centered_text(x_offset, y, "pppp", theta + 3 * pi / 4, + align_baseline=True, + bb_stroke_color=(0, 0, 0, 0.5), + bb_fill_color=(1, 1, 1, 0.8)) + x_offset += advance + + advance = diagram.draw_centered_text(x_offset, y, "dddd", theta + pi, + align_baseline=True, + bb_stroke_color=(0, 0, 0, 0.5), + bb_fill_color=(1, 1, 1, 0.8)) + x_offset += advance + + advance = diagram.draw_centered_text(x_offset, y, "Jjjj", theta + 5 * pi / 4, + align_baseline=True, + bb_stroke_color=(0, 0, 0, 0.5), + bb_fill_color=(1, 1, 1, 0.8)) + x_offset += advance + + advance = diagram.draw_centered_text(x_offset, y, "1369", theta + 3 * pi / 2, + color=(0, 1, 0), + align_baseline=True, + bb_stroke_color=(0, 0, 0, 0.5), + bb_fill_color=(1, 1, 1, 0.8)) + x_offset += advance + + advance = diagram.draw_centered_text(x_offset, y, "qqqq", theta + 7 * pi / 4, + align_baseline=True, + bb_stroke_color=(0, 0, 0, 0.5), + bb_fill_color=(1, 1, 1, 0.8)) + x_offset += advance + + 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)) + + verts = diagram.draw_regular_polygon(190, 90, 3, 20) + + 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) + + verts = diagram.draw_regular_polygon(190, 300, 6, 20, pi / 3., (0, 0, 1, 0.5), (0, 1, 0.5)) + diagram.draw_apothem_star(190, 300, 6, 20, 0, (1, 0, 1)) + + diagram.draw_star_by_verts(190, 300, verts, (1, 0, 0, 0.5)) + diagram.draw_star(190, 300, 6, 25, 0, (1, 0, 1, 0.2)) + + diagram.draw_circle(190, 300, 30, (0, 1, 0, 0.5), None) + diagram.draw_circle(100, 300, 30, (1, 0, 0, 0.5), (0, 1, 1, 0.5)) + + @staticmethod def color_to_rgba(color): assert len(color) >= 3 @@ -46,6 +127,66 @@ class Diagram(object): return fmod(theta, 2 * pi) / (2 * pi) @staticmethod + def calc_rotate_translate_transform(src_x, src_y, dest_x, dest_y, theta): + """Calculate the transformation matrix resulting from a rotation and + a translation. + + Return the matrix as a list of values sorted in row-major order.""" + + # A rotate-translate transformation is composed by these steps: + # + # 1. rotate by 'theta' around (src_x, src_y); + # 2. move to (dest_x, dest_y). + # + # Step 1 can be expressed by these sub-steps: + # + # 1a. translate by (-src_x, -src_y) + # 1b. rotate by 'theta' + # 1c. translate by (src_x, src_y) + # + # Step 2. can be expressed by a translation like: + # + # 2a. translate by (dest_x - src_x, dest_y - src_y) + # + # The consecutive translations 1c and 2a can be easily combined, so + # the final steps are: + # + # T1 -> translate by (-src_x, -src_y) + # R -> rotate by 'theta' + # T2 -> translate by (dest_x, dest_y) + # + # Using affine transformations these are expressed as: + # + # | 1 0 -src_x | + # T1 = | 0 1 -src_y | + # | 0 0 1 | + # + # | cos(theta) -sin(theta) 0 | + # R = | sin(theta) cos(theta) 0 | + # | 0 0 1 | + # + # | 1 0 dest_x | + # T2 = | 0 1 dest_y | + # | 0 0 1 | + # + # Composing these transformations into one is achieved by multiplying + # the matrices from right to left: + # + # T = T2 * R * T1 + # + # NOTE: To remember this think about composing functions: T2(R(T1())), + # the inner one is performed first. + # + # The resulting T matrix is the one below. + matrix = [ + cos(theta), -sin(theta), -src_x * cos(theta) + src_y * sin(theta) + dest_x, + sin(theta), cos(theta), -src_x * sin(theta) - src_y * cos(theta) + dest_y, + 0, 0, 1 + ] + + return matrix + + @staticmethod def get_regular_polygon(x, y, sides, r, theta0=0.0): """Calc the coordinates of the regular polygon. @@ -86,3 +227,22 @@ class Diagram(object): apothem_angle = theta + pi / sides return self.draw_star(cx, cy, sides, apothem, apothem_angle, stroke_color) + + def draw_rect(self, x, y, width, height, theta=0, + stroke_color=None, + fill_color=(1, 1, 1, 0.8)): + raise NotImplementedError + + def draw_rect_from_center(self, cx, cy, width, height, theta=0.0, + stroke_color=None, + fill_color=(1, 1, 1, 0.8)): + # 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)) + + self.draw_rect(rx, ry, width, height, theta, stroke_color, fill_color)