Wed, 20 Jan 2021 11:37:03 +0100
reimplemented lasercutter changes
15 | 1 | """ |
2 | BufferedCanvas -- flicker-free canvas widget | |
3 | Copyright (C) 2005, 2006 Daniel Keep, 2011 Duane Johnson | |
4 | ||
5 | To use this widget, just override or replace the draw method. | |
6 | This will be called whenever the widget size changes, or when | |
7 | the update method is explicitly called. | |
8 | ||
9 | Please submit any improvements/bugfixes/ideas to the following | |
10 | url: | |
11 | ||
12 | http://wiki.wxpython.org/index.cgi/BufferedCanvas | |
13 | ||
14 | 2006-04-29: Added bugfix for a crash on Mac provided by Marc Jans. | |
15 | """ | |
16 | ||
17 | # Hint: try removing '.sp4msux0rz' | |
18 | __author__ = 'Daniel Keep <daniel.keep.sp4msux0rz@gmail.com>' | |
19 | ||
20 | __license__ = """ | |
21 | This file is part of the Printrun suite. | |
22 | ||
23 | Printrun is free software: you can redistribute it and/or modify | |
24 | it under the terms of the GNU General Public License as published by | |
25 | the Free Software Foundation, either version 3 of the License, or | |
26 | (at your option) any later version. | |
27 | ||
28 | Printrun is distributed in the hope that it will be useful, | |
29 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
30 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31 | GNU General Public License for more details. | |
32 | ||
33 | You should have received a copy of the GNU General Public License | |
34 | along with Printrun. If not, see <http://www.gnu.org/licenses/>. | |
35 | """ | |
36 | ||
37 | __all__ = ['BufferedCanvas'] | |
38 | ||
39 | import wx | |
40 | ||
41 | class BufferedCanvas(wx.Panel): | |
42 | """ | |
43 | Implements a flicker-free canvas widget. | |
44 | ||
45 | Standard usage is to subclass this class, and override the | |
46 | draw method. The draw method is passed a device context, which | |
47 | should be used to do your drawing. | |
48 | ||
49 | If you want to force a redraw (for whatever reason), you should | |
50 | call the update method. This is because the draw method is never | |
51 | called as a result of an EVT_PAINT event. | |
52 | """ | |
53 | ||
54 | # These are our two buffers. Just be aware that when the buffers | |
55 | # are flipped, the REFERENCES are swapped. So I wouldn't want to | |
56 | # try holding onto explicit references to one or the other ;) | |
57 | buffer = None | |
58 | backbuffer = None | |
59 | ||
60 | def __init__(self, | |
61 | parent, | |
62 | ID=-1, | |
63 | pos = wx.DefaultPosition, | |
64 | size = wx.DefaultSize, | |
65 | style = wx.NO_FULL_REPAINT_ON_RESIZE | wx.WANTS_CHARS): | |
66 | wx.Panel.__init__(self, parent, ID, pos, size, style) | |
67 | ||
68 | # Bind events | |
69 | self.Bind(wx.EVT_PAINT, self.onPaint) | |
70 | ||
71 | # Disable background erasing (flicker-licious) | |
72 | def disable_event(*pargs, **kwargs): | |
73 | pass # the sauce, please | |
74 | self.Bind(wx.EVT_ERASE_BACKGROUND, disable_event) | |
75 | ||
76 | # | |
77 | # General methods | |
78 | # | |
79 | ||
80 | def draw(self, dc, w, h): | |
81 | """ | |
82 | Stub: called when the canvas needs to be re-drawn. | |
83 | """ | |
84 | pass | |
85 | ||
86 | def update(self): | |
87 | """ | |
88 | Causes the canvas to be updated. | |
89 | """ | |
90 | self.Refresh() | |
91 | ||
92 | def getWidthHeight(self): | |
46 | 93 | width, height = self.GetClientSize() |
15 | 94 | if width == 0: |
95 | width = 1 | |
96 | if height == 0: | |
97 | height = 1 | |
98 | return (width, height) | |
99 | ||
100 | # | |
101 | # Event handlers | |
102 | # | |
103 | ||
104 | def onPaint(self, event): | |
105 | # Blit the front buffer to the screen | |
46 | 106 | w, h = self.GetClientSize() |
15 | 107 | if not w or not h: |
108 | return | |
109 | else: | |
110 | dc = wx.BufferedPaintDC(self) | |
111 | self.draw(dc, w, h) |