projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| d14a1e28 RD |
1 | """ |
| 2 | wxPyColourChooser | |
| 3 | Copyright (C) 2002 Michael Gilfix | |
| 1fded56b | 4 | |
| d14a1e28 | 5 | This file is part of wxPyColourChooser. |
| 1fded56b | 6 | |
| d14a1e28 RD |
7 | You should have received a file COPYING containing license terms |
| 8 | along with this program; if not, write to Michael Gilfix | |
| 9 | (mgilfix@eecs.tufts.edu) for a copy. | |
| 10 | ||
| 11 | This version of wxPyColourChooser is open source; you can redistribute it and/or | |
| 12 | modify it under the terms listed in the file COPYING. | |
| 13 | ||
| 14 | This program is distributed in the hope that it will be useful, | |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| 17 | """ | |
| 18 | ||
| 19 | import canvas | |
| 20 | import colorsys | |
| 21 | from wxPython.wx import * | |
| 22 | ||
| 23 | class PyColourSlider(canvas.Canvas): | |
| 24 | """A Pure-Python Colour Slider | |
| 25 | ||
| 26 | The colour slider displays transitions from value 0 to value 1 in | |
| 27 | HSV, allowing the user to select a colour within the transition | |
| 28 | spectrum. | |
| 29 | ||
| 30 | This class is best accompanying by a wxSlider that allows the user | |
| 31 | to select a particular colour shade. | |
| 32 | """ | |
| 33 | ||
| 34 | HEIGHT = 172 | |
| 35 | WIDTH = 12 | |
| 36 | ||
| 37 | def __init__(self, parent, id, colour=None): | |
| 38 | """Creates a blank slider instance. A colour must be set before the | |
| 39 | slider will be filled in.""" | |
| 40 | # Set the base colour first since our base class calls the buffer | |
| 41 | # drawing function | |
| 42 | self.SetBaseColour(colour) | |
| 43 | ||
| 44 | canvas.Canvas.__init__(self, parent, id, | |
| 45 | size=wxSize(self.WIDTH, self.HEIGHT)) | |
| 46 | ||
| 47 | def SetBaseColour(self, colour): | |
| 48 | """Sets the base, or target colour, to use as the central colour | |
| 49 | when calculating colour transitions.""" | |
| 50 | self.base_colour = colour | |
| 51 | ||
| 52 | def GetBaseColour(self): | |
| 53 | """Return the current colour used as a colour base for filling out | |
| 54 | the slider.""" | |
| 55 | return self.base_colour | |
| 56 | ||
| 57 | def GetValue(self, pos): | |
| 58 | """Returns the colour value for a position on the slider. The position | |
| 59 | must be within the valid height of the slider, or results can be | |
| 60 | unpredictable.""" | |
| 61 | return self.buffer.GetPixel(0, pos) | |
| 62 | ||
| 63 | def DrawBuffer(self): | |
| 64 | """Actual implementation of the widget's drawing. We simply draw | |
| 65 | from value 0.0 to value 1.0 in HSV.""" | |
| 66 | if self.base_colour is None: | |
| 67 | return | |
| 68 | ||
| 69 | target_red = self.base_colour.Red() | |
| 70 | target_green = self.base_colour.Green() | |
| 71 | target_blue = self.base_colour.Blue() | |
| 72 | ||
| 73 | h,s,v = colorsys.rgb_to_hsv(target_red / 255.0, target_green / 255.0, | |
| 74 | target_blue / 255.0) | |
| 75 | v = 1.0 | |
| 76 | vstep = 1.0 / self.HEIGHT | |
| 77 | for y_pos in range(0, self.HEIGHT): | |
| 78 | r,g,b = [c * 255.0 for c in colorsys.hsv_to_rgb(h,s,v)] | |
| 79 | colour = wxColour(int(r), int(g), int(b)) | |
| 80 | self.buffer.SetPen(wxPen(colour, 1, wxSOLID)) | |
| 81 | self.buffer.DrawRectangle(0, y_pos, 15, 1) | |
| 82 | v = v - vstep |