| 1 | """ |
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| 2 | Arc slicer for 2D data |
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| 3 | """ |
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| 4 | import math |
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| 5 | |
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| 6 | from BaseInteractor import _BaseInteractor |
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| 7 | from sans.guiframe.events import SlicerParameterEvent |
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| 8 | |
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| 9 | class ArcInteractor(_BaseInteractor): |
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| 10 | """ |
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| 11 | Select an annulus through a 2D plot |
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| 12 | """ |
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| 13 | def __init__(self, base, axes, color='black', zorder=5, r=1.0, |
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| 14 | theta1=math.pi/8, theta2=math.pi/4): |
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| 15 | |
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| 16 | _BaseInteractor.__init__(self, base, axes, color=color) |
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| 17 | self.markers = [] |
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| 18 | self.axes = axes |
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| 19 | self._mouse_x = r |
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| 20 | self._mouse_y = 0 |
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| 21 | |
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| 22 | self._save_x = r |
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| 23 | self._save_y = 0 |
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| 24 | |
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| 25 | self.scale = 10.0 |
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| 26 | |
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| 27 | self.theta1 = theta1 |
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| 28 | self.theta2 = theta2 |
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| 29 | self.radius = r |
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| 30 | [self.arc] = self.axes.plot([], [], |
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| 31 | linestyle='-', marker='', |
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| 32 | color=self.color) |
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| 33 | self.npts = 20 |
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| 34 | self.has_move = False |
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| 35 | self.connect_markers([self.arc]) |
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| 36 | self.update() |
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| 37 | |
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| 38 | def set_layer(self, n): |
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| 39 | """ |
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| 40 | Allow adding plot to the same panel |
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| 41 | :param n: the number of layer |
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| 42 | """ |
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| 43 | self.layernum = n |
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| 44 | self.update() |
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| 45 | |
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| 46 | def clear(self): |
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| 47 | """ |
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| 48 | Clear this slicer and its markers |
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| 49 | """ |
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| 50 | self.clear_markers() |
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| 51 | try: |
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| 52 | for item in self.markers: |
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| 53 | item.remove() |
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| 54 | self.arc.remove() |
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| 55 | except: |
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| 56 | # Old version of matplotlib |
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| 57 | for item in range(len(self.axes.lines)): |
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| 58 | del self.axes.lines[0] |
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| 59 | |
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| 60 | def get_radius(self): |
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| 61 | """ |
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| 62 | Return arc radius |
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| 63 | """ |
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| 64 | radius = math.sqrt(math.pow(self._mouse_x, 2) + \ |
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| 65 | math.pow(self._mouse_y, 2)) |
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| 66 | return radius |
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| 67 | |
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| 68 | def update(self, theta1=None, theta2=None, nbins=None, r=None): |
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| 69 | """ |
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| 70 | Update the plotted arc |
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| 71 | :param theta1: starting angle of the arc |
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| 72 | :param theta2: ending angle of the arc |
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| 73 | :param nbins: number of points along the arc |
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| 74 | :param r: radius of the arc |
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| 75 | """ |
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| 76 | # Plot inner circle |
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| 77 | x = [] |
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| 78 | y = [] |
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| 79 | if theta1 != None: |
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| 80 | self.theta1 = theta1 |
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| 81 | if theta2 != None: |
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| 82 | self.theta2 = theta2 |
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| 83 | while self.theta2 < self.theta1: |
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| 84 | self.theta2 += (2 * math.pi) |
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| 85 | while self.theta2 >= (self.theta1 + 2 * math.pi): |
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| 86 | self.theta2 -= (2 * math.pi) |
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| 87 | npts = int((self.theta2 - self.theta1)/(math.pi/120)) |
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| 88 | |
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| 89 | if r == None: |
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| 90 | self.radius = math.sqrt(math.pow(self._mouse_x, 2) + \ |
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| 91 | math.pow(self._mouse_y, 2)) |
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| 92 | else: |
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| 93 | self.radius = r |
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| 94 | for i in range(self.npts): |
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| 95 | phi = (self.theta2 - self.theta1)/(self.npts - 1) * i + self.theta1 |
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| 96 | xval = 1.0 * self.radius * math.cos(phi) |
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| 97 | yval = 1.0 * self.radius * math.sin(phi) |
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| 98 | |
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| 99 | x.append(xval) |
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| 100 | y.append(yval) |
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| 101 | #self.marker.set(xdata=[self._mouse_x],ydata=[0]) |
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| 102 | self.arc.set_data(x, y) |
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| 103 | |
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| 104 | def save(self, ev): |
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| 105 | """ |
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| 106 | Remember the roughness for this layer and the next so that we |
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| 107 | can restore on Esc. |
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| 108 | """ |
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| 109 | self._save_x = self._mouse_x |
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| 110 | self._save_y = self._mouse_y |
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| 111 | #self._save_x = ev.xdata |
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| 112 | #self._save_y = ev.ydata |
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| 113 | self.base.freeze_axes() |
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| 114 | |
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| 115 | def moveend(self, ev): |
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| 116 | """ |
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| 117 | After a dragging motion reset the flag self.has_move to False |
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| 118 | :param ev: event |
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| 119 | """ |
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| 120 | self.has_move = False |
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| 121 | |
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| 122 | event = SlicerParameterEvent() |
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| 123 | event.type = self.__class__.__name__ |
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| 124 | event.params = self.get_params() |
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| 125 | self.base.moveend(ev) |
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| 126 | |
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| 127 | def restore(self): |
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| 128 | """ |
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| 129 | Restore the roughness for this layer. |
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| 130 | """ |
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| 131 | self._mouse_x = self._save_x |
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| 132 | self._mouse_y = self._save_y |
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| 133 | |
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| 134 | def move(self, x, y, ev): |
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| 135 | """ |
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| 136 | Process move to a new position, making sure that the move is allowed. |
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| 137 | """ |
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| 138 | #print "ring move x, y", x,y |
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| 139 | self._mouse_x = x |
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| 140 | self._mouse_y = y |
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| 141 | self.has_move = True |
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| 142 | self.base.base.update() |
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| 143 | |
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| 144 | def set_cursor(self, radius, phi_min, phi_max, nbins): |
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| 145 | """ |
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| 146 | """ |
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| 147 | self.theta1 = phi_min |
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| 148 | self.theta2 = phi_max |
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| 149 | self.update(nbins=nbins, r=radius) |
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| 150 | |
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| 151 | def get_params(self): |
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| 152 | """ |
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| 153 | """ |
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| 154 | params = {} |
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| 155 | params["radius"] = self.radius |
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| 156 | params["theta1"] = self.theta1 |
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| 157 | params["theta2"] = self.theta2 |
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| 158 | return params |
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| 159 | |
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| 160 | def set_params(self, params): |
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| 161 | """ |
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| 162 | """ |
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| 163 | x = params["radius"] |
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| 164 | phi_max = self.theta2 |
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| 165 | nbins = self.npts |
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| 166 | self.set_cursor(x, self._mouse_y, phi_max, nbins) |
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| 167 | |
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| 168 | |
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