diff options
Diffstat (limited to 'src/jarabe/desktop/favoriteslayout.py')
| -rw-r--r-- | src/jarabe/desktop/favoriteslayout.py | 142 |
1 files changed, 107 insertions, 35 deletions
diff --git a/src/jarabe/desktop/favoriteslayout.py b/src/jarabe/desktop/favoriteslayout.py index 85e1b59..360c147 100644 --- a/src/jarabe/desktop/favoriteslayout.py +++ b/src/jarabe/desktop/favoriteslayout.py @@ -1,4 +1,5 @@ # Copyright (C) 2008 One Laptop Per Child +# Copyright (C) 2010 Sugar Labs # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by @@ -28,10 +29,18 @@ from sugar.graphics import style from jarabe.model import bundleregistry from jarabe.desktop.grid import Grid + _logger = logging.getLogger('FavoritesLayout') _CELL_SIZE = 4 _BASE_SCALE = 1000 +_INTERMEDIATE_B = (style.STANDARD_ICON_SIZE + style.SMALL_ICON_SIZE) / 2 +_INTERMEDIATE_A = (style.STANDARD_ICON_SIZE + _INTERMEDIATE_B) / 2 +_INTERMEDIATE_C = (_INTERMEDIATE_B + style.SMALL_ICON_SIZE) / 2 +_ICON_SIZES = [style.MEDIUM_ICON_SIZE, style.STANDARD_ICON_SIZE, + _INTERMEDIATE_A, _INTERMEDIATE_B, _INTERMEDIATE_C, + style.SMALL_ICON_SIZE] + class FavoritesLayout(gobject.GObject, hippo.CanvasLayout): """Base class of the different layout types.""" @@ -81,7 +90,8 @@ class FavoritesLayout(gobject.GObject, hippo.CanvasLayout): if icon not in self.box.get_children(): raise ValueError('Child not in box.') - if not(hasattr(icon, 'get_bundle_id') and hasattr(icon, 'get_version')): + if not (hasattr(icon, 'get_bundle_id') and + hasattr(icon, 'get_version')): logging.debug('Not an activity icon %r', icon) return @@ -101,6 +111,7 @@ class FavoritesLayout(gobject.GObject, hippo.CanvasLayout): def allow_dnd(self): return False + class RandomLayout(FavoritesLayout): """Lay out icons randomly; try to nudge them around to resolve overlaps.""" @@ -181,13 +192,19 @@ class RandomLayout(FavoritesLayout): def allow_dnd(self): return True + _MINIMUM_RADIUS = style.XLARGE_ICON_SIZE / 2 + style.DEFAULT_SPACING + \ style.STANDARD_ICON_SIZE * 2 _MAXIMUM_RADIUS = (gtk.gdk.screen_height() - style.GRID_CELL_SIZE) / 2 - \ style.STANDARD_ICON_SIZE - style.DEFAULT_SPACING +_ICON_SPACING_FACTORS = [1.5, 1.4, 1.3, 1.2, 1.1, 1.0] +_SPIRAL_SPACING_FACTORS = [1.5, 1.5, 1.5, 1.4, 1.3, 1.2] +_MIMIMUM_RADIUS_ENCROACHMENT = 0.75 +_INITIAL_ANGLE = math.pi + class RingLayout(FavoritesLayout): - """Lay out icons in a ring around the XO man.""" + """Lay out icons in a ring or spiral around the XO man.""" __gtype_name__ = 'RingLayout' icon_name = 'view-radial' @@ -201,6 +218,7 @@ class RingLayout(FavoritesLayout): def __init__(self): FavoritesLayout.__init__(self) self._locked_children = {} + self._spiral_mode = False def append(self, icon, locked=False): FavoritesLayout.append(self, icon, locked) @@ -221,33 +239,78 @@ class RingLayout(FavoritesLayout): self._locked_children[child] = (x, y) def _calculate_radius_and_icon_size(self, children_count): - # what's the radius required without downscaling? - distance = style.STANDARD_ICON_SIZE + style.DEFAULT_SPACING + """ Adjust the ring or spiral radius and icon size as needed. """ + self._spiral_mode = False + distance = style.MEDIUM_ICON_SIZE + style.DEFAULT_SPACING * \ + _ICON_SPACING_FACTORS[_ICON_SIZES.index(style.MEDIUM_ICON_SIZE)] + radius = max(children_count * distance / (2 * math.pi), + _MINIMUM_RADIUS) + if radius < _MAXIMUM_RADIUS: + return radius, style.MEDIUM_ICON_SIZE + + distance = style.STANDARD_ICON_SIZE + style.DEFAULT_SPACING * \ + _ICON_SPACING_FACTORS[_ICON_SIZES.index(style.STANDARD_ICON_SIZE)] + radius = max(children_count * distance / (2 * math.pi), + _MINIMUM_RADIUS) + if radius < _MAXIMUM_RADIUS: + return radius, style.STANDARD_ICON_SIZE + + self._spiral_mode = True icon_size = style.STANDARD_ICON_SIZE - # circumference is 2*pi*r; we want this to be at least - # 'children_count * distance' - radius = children_count * distance / (2 * math.pi) - # limit computed radius to reasonable bounds. - radius = max(radius, _MINIMUM_RADIUS) - radius = min(radius, _MAXIMUM_RADIUS) - # recompute icon size from limited radius - if children_count > 0: - icon_size = (2 * math.pi * radius / children_count) \ - - style.DEFAULT_SPACING - # limit adjusted icon size. - icon_size = max(icon_size, style.SMALL_ICON_SIZE) - icon_size = min(icon_size, style.MEDIUM_ICON_SIZE) + angle_, radius = self._calculate_angle_and_radius(children_count, + icon_size) + while radius > _MAXIMUM_RADIUS: + i = _ICON_SIZES.index(icon_size) + if i < len(_ICON_SIZES) - 1: + icon_size = _ICON_SIZES[i + 1] + angle_, radius = self._calculate_angle_and_radius( + children_count, icon_size) + else: + break return radius, icon_size - def _calculate_position(self, radius, icon_size, index, children_count, - sin=math.sin, cos=math.cos): + def _calculate_position(self, radius, icon_size, icon_index, + children_count, sin=math.sin, cos=math.cos): + """ Calculate an icon position on a circle or a spiral. """ width, height = self.box.get_allocation() - angle = index * (2 * math.pi / children_count) - math.pi / 2 - x = radius * cos(angle) + (width - icon_size) / 2 - y = radius * sin(angle) + (height - icon_size - - (style.GRID_CELL_SIZE/2) ) / 2 + if self._spiral_mode: + min_width_, box_width = self.box.get_width_request() + min_height_, box_height = self.box.get_height_request(box_width) + angle, radius = self._calculate_angle_and_radius(icon_index, + icon_size) + x, y = self._convert_from_polar_to_cartesian(angle, radius, + icon_size, + width, height) + else: + angle = icon_index * (2 * math.pi / children_count) - math.pi / 2 + x = radius * cos(angle) + (width - icon_size) / 2 + y = radius * sin(angle) + (height - icon_size - \ + (style.GRID_CELL_SIZE / 2)) / 2 + return x, y + + def _convert_from_polar_to_cartesian(self, angle, radius, icon_size, width, + height): + """ Convert angle, radius to x, y """ + x = int(math.sin(angle) * radius) + y = int(math.cos(angle) * radius) + x = - x + (width - icon_size) / 2 + y = y + (height - icon_size - (style.GRID_CELL_SIZE / 2)) / 2 return x, y + def _calculate_angle_and_radius(self, icon_count, icon_size): + """ Based on icon_count and icon_size, calculate radius and angle. """ + spiral_spacing = _SPIRAL_SPACING_FACTORS[_ICON_SIZES.index(icon_size)] + icon_spacing = icon_size + style.DEFAULT_SPACING * \ + _ICON_SPACING_FACTORS[_ICON_SIZES.index(icon_size)] + angle = _INITIAL_ANGLE + radius = _MINIMUM_RADIUS - (icon_size * _MIMIMUM_RADIUS_ENCROACHMENT) + for i_ in range(icon_count): + circumference = radius * 2 * math.pi + n = circumference / icon_spacing + angle += (2 * math.pi / n) + radius += (float(icon_spacing) * spiral_spacing / n) + return angle, radius + def _get_children_in_ring(self): children_in_ring = [child for child in self.box.get_layout_children() \ if child not in self._locked_children] @@ -294,6 +357,7 @@ class RingLayout(FavoritesLayout): else: return 0 + _SUNFLOWER_CONSTANT = style.STANDARD_ICON_SIZE * .75 """Chose a constant such that STANDARD_ICON_SIZE icons are nicely spaced.""" @@ -319,6 +383,7 @@ This is the golden angle: http://en.wikipedia.org/wiki/Golden_angle Calculation: math.radians(360) / ( _GOLDEN_RATIO * _GOLDEN_RATIO ) """ + class SunflowerLayout(RingLayout): """Spiral layout based on Fibonacci ratio in phyllotaxis. @@ -346,7 +411,8 @@ class SunflowerLayout(RingLayout): return None, style.STANDARD_ICON_SIZE def adjust_index(self, i): - """Skip floret indices which end up outside the desired bounding box.""" + """Skip floret indices which end up outside the desired bounding box. + """ for idx in self.skipped_indices: if i < idx: break @@ -377,7 +443,7 @@ class SunflowerLayout(RingLayout): # removed to make room for the "active activity" icon. x = r * cos(phi) + (width - icon_size) / 2 y = r * sin(phi) + (height - icon_size - \ - (style.GRID_CELL_SIZE / 2) ) / 2 + (style.GRID_CELL_SIZE / 2)) / 2 # skip allocations outside the allocation box. # give up once we can't fit @@ -385,10 +451,12 @@ class SunflowerLayout(RingLayout): if y < 0 or y > (height - icon_size) or \ x < 0 or x > (width - icon_size): self.skipped_indices.append(index) - continue # try again + # try again + continue return x, y + class BoxLayout(RingLayout): """Lay out icons in a square around the XO man.""" @@ -421,14 +489,16 @@ class BoxLayout(RingLayout): return (90 - d) / 45. if d < 225: return -1 - return cos_d(360 - d) # mirror around 180 + # mirror around 180 + return cos_d(360 - d) cos = lambda r: cos_d(math.degrees(r)) sin = lambda r: cos_d(math.degrees(r) - 90) - return RingLayout._calculate_position\ - (self, radius, icon_size, index, children_count, - sin=sin, cos=cos) + return RingLayout._calculate_position(self, radius, icon_size, index, + children_count, sin=sin, + cos=cos) + class TriangleLayout(RingLayout): """Lay out icons in a triangle around the XO man.""" @@ -467,7 +537,8 @@ class TriangleLayout(RingLayout): return (d + 90) / 120. if d <= 90: return (90 - d) / 60. - return -cos_d(180 - d) # mirror around 90 + # mirror around 90 + return -cos_d(180 - d) sqrt_3 = math.sqrt(3) @@ -478,11 +549,12 @@ class TriangleLayout(RingLayout): return ((d + 90) / 120.) * sqrt_3 - 1 if d <= 90: return sqrt_3 - 1 - return sin_d(180 - d) # mirror around 90 + # mirror around 90 + return sin_d(180 - d) cos = lambda r: cos_d(math.degrees(r)) sin = lambda r: sin_d(math.degrees(r)) - return RingLayout._calculate_position\ - (self, radius, icon_size, index, children_count, - sin=sin, cos=cos) + return RingLayout._calculate_position(self, radius, icon_size, index, + children_count, sin=sin, + cos=cos) |