| Parker Schuh | 19b93b1 | 2018-03-02 23:26:58 -0800 | [diff] [blame^] | 1 | import gi |
| 2 | gi.require_version('Gtk', '3.0') |
| 3 | from gi.repository import Gtk |
| 4 | from gi.repository import GLib |
| 5 | from gi.repository import Gdk |
| 6 | from gi.repository import GdkX11 |
| 7 | import cairo |
| 8 | |
| 9 | identity = cairo.Matrix() |
| 10 | |
| 11 | # Override the matrix of a cairo context. |
| 12 | class OverrideMatrix(object): |
| 13 | def __init__(self, cr, matrix): |
| 14 | self.cr = cr |
| 15 | self.matrix = matrix |
| 16 | def __enter__(self): |
| 17 | self.cr.save() |
| 18 | self.cr.set_matrix(self.matrix) |
| 19 | |
| 20 | def __exit__(self, type, value, traceback): |
| 21 | self.cr.restore(); |
| 22 | |
| 23 | mainloop = GLib.MainLoop() |
| 24 | |
| 25 | def quit_main_loop(*args): |
| 26 | mainloop.quit() |
| 27 | |
| 28 | def RunApp(): |
| 29 | try: |
| 30 | mainloop.run(); |
| 31 | except KeyboardInterrupt: |
| 32 | print('\nCtrl+C hit, quitting') |
| 33 | mainloop.quit() |
| 34 | |
| 35 | # Create a GTK+ widget on which we will draw using Cairo |
| 36 | class BaseWindow(Gtk.DrawingArea): |
| 37 | def method_connect(self, event, cb): |
| 38 | def handler(obj, *args): |
| 39 | cb(*args) |
| 40 | self.window.connect(event, handler) |
| 41 | |
| 42 | # Draw in response to an expose-event |
| 43 | def __init__(self): |
| 44 | super().__init__() |
| 45 | self.window = Gtk.Window() |
| 46 | self.window.set_title("DrawingArea") |
| 47 | self.window.connect("destroy", quit_main_loop) |
| 48 | self.window.set_events(Gdk.EventMask.BUTTON_PRESS_MASK | |
| 49 | Gdk.EventMask.BUTTON_RELEASE_MASK | |
| 50 | Gdk.EventMask.POINTER_MOTION_MASK | |
| 51 | Gdk.EventMask.SCROLL_MASK | |
| 52 | Gdk.EventMask.KEY_PRESS_MASK |
| 53 | ) |
| 54 | self.method_connect("key-press-event", self.do_key_press) |
| 55 | self.method_connect("button-press-event", self._do_button_press_internal) |
| 56 | self.method_connect("configure-event", self._do_configure) |
| 57 | |
| 58 | self.set_size_request(640, 400) #640 * 2, 1229) |
| 59 | self.window.add(self) |
| 60 | self.window.show_all() |
| 61 | self.center = (0, 0) |
| 62 | self.shape = (640, 400) |
| 63 | self.needs_redraw = False |
| 64 | |
| 65 | def get_current_scale(self): |
| 66 | w_w, w_h = self.window_shape |
| 67 | w, h = self.shape |
| 68 | return min((w_w / w), (w_h / h)) |
| 69 | |
| 70 | def init_extents(self, center, shape): |
| 71 | self.center = center |
| 72 | self.shape = shape |
| 73 | |
| 74 | # The gtk system creates cr which is a cairo_context_t (in the c docs), and then it |
| 75 | # passes it as a function argument to the "draw" event. do_draw is the default name. |
| 76 | def do_draw(self, cr): |
| 77 | cr.save() |
| 78 | cr.set_font_size(20) |
| 79 | cr.translate(self.window_shape[0] / 2, self.window_shape[1] / 2) |
| 80 | scale = self.get_current_scale() |
| 81 | cr.scale(scale, -scale) |
| 82 | cr.translate(-self.center[0], -self.center[1]) |
| 83 | self.needs_redraw = False |
| 84 | self.handle_draw(cr) |
| 85 | cr.restore() |
| 86 | |
| 87 | # Handle the expose-event by drawing |
| 88 | def handle_draw(self, cr): |
| 89 | pass |
| 90 | |
| 91 | def do_key_press(self, event): |
| 92 | pass |
| 93 | |
| 94 | def _do_button_press_internal(self, event): |
| 95 | o_x = event.x |
| 96 | o_y = event.y |
| 97 | x = event.x - self.window_shape[0] / 2 |
| 98 | y = self.window_shape[1] / 2 - event.y |
| 99 | scale = self.get_current_scale() |
| 100 | event.x = x / scale + self.center[0] |
| 101 | event.y = y / scale + self.center[1] |
| 102 | self.do_button_press(event) |
| 103 | event.x = o_x |
| 104 | event.y = o_y |
| 105 | |
| 106 | def do_button_press(self, event): |
| 107 | pass |
| 108 | |
| 109 | def _do_configure(self, event): |
| 110 | self.window_shape = (event.width, event.height) |
| 111 | |
| 112 | def redraw(self): |
| 113 | if not self.needs_redraw: |
| 114 | self.needs_redraw = True |
| 115 | self.window.queue_draw() |