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261 lines
9.8 KiB
261 lines
9.8 KiB
from functools import partial |
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from PyQt5.QtCore import Qt |
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from PyQt5.QtGui import QCursor |
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from PyQt5.QtWidgets import QErrorMessage, QFileDialog, QInputDialog, QMainWindow |
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from voronoiview.exceptions import handle_exceptions |
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from voronoiview.mode import Mode |
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from voronoiview.ui.mode_handlers import (MODE_HANDLER_MAP, |
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ogl_keypress_handler, |
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refresh_point_list, |
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reset_colors, |
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generate_random_points) |
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from voronoiview.ui.opengl_widget import (clear_selection, initialize_gl, |
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mouse_leave, paint_gl, resize_gl, |
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set_drawing_context) |
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from voronoiview.points import PointSet |
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from voronoiview.point_manager import PointManager |
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from voronoiview.ui.point_list_widget import item_click_handler |
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from voronoiview_ui import Ui_MainWindow |
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class MainWindow(QMainWindow, Ui_MainWindow): |
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""" |
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A wrapper class for handling creating a window based |
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on the `voronoiview_ui.py` code generated from |
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`voronoiview.ui`. |
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""" |
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# This is a static mode variable since there will only ever |
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# be one MainWindow. |
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_mode = Mode.OFF |
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def __init__(self, parent=None): |
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super(MainWindow, self).__init__(parent) |
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self.setupUi(self) |
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# Size of point for drawing |
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self._point_size = 4 * self.devicePixelRatio() |
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self._viewport_width = self.opengl_widget.width() * self.devicePixelRatio() |
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self._viewport_height = self.opengl_widget.height() * self.devicePixelRatio() |
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# PointManager is a class that is filled with static methods |
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# designed for managing state. |
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PointManager.point_set = PointSet(self._point_size, |
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self._viewport_width, |
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self._viewport_height) |
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self.voronoi_button.setEnabled(False) |
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# We only need to set the context in our OpenGL state machine |
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# wrapper once here since the window is fixed size. |
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# If we allow resizing of the window, the context must be updated |
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# each resize so that coordinates are converted from screen (x, y) |
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# to OpenGL coordinates properly. |
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set_drawing_context(self) |
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# Enables mouse tracking on the viewport so mouseMoveEvents are |
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# tracked and fired properly. |
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self.opengl_widget.setMouseTracking(True) |
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# Enable keyboard input capture on the OpenGL Widget |
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self.opengl_widget.setFocusPolicy(Qt.StrongFocus) |
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# Here we partially apply the key press handler with self to |
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# create a new function that only expects the event `keyPressEvent` |
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# expects. In this way, we've snuck the state of the opengl_widget |
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# into the function so that we can modify it as we please. |
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self.opengl_widget.keyPressEvent = partial(ogl_keypress_handler, self) |
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# Same story here but this time with the itemClicked event |
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# so that when an element is clicked on in the point list it will |
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# highlight. |
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self.point_list_widget.itemClicked.connect(partial(item_click_handler, |
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self)) |
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self.voronoi_button.clicked.connect(self._voronoi) |
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self.reset_button.clicked.connect(self._reset) |
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# ----------------------------------------------- |
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# OpenGL Graphics Handlers are set |
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# here and defined in voronoiview.opengl_widget. |
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# ----------------------------------------------- |
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self.opengl_widget.initializeGL = initialize_gl |
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self.opengl_widget.paintGL = paint_gl |
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self.opengl_widget.resizeGL = resize_gl |
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self.opengl_widget.leaveEvent = partial(mouse_leave, self) |
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# ------------------------------------- |
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# UI Handlers |
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# ------------------------------------- |
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self.action_add_points.triggered.connect(self._add_points) |
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self.action_edit_points.triggered.connect(self._edit_points) |
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self.action_delete_points.triggered.connect(self._delete_points) |
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self.action_move_points.triggered.connect(self._move_points) |
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self.action_clear_canvas.triggered.connect(self._clear_canvas) |
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(self.action_generate_random_points |
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.triggered.connect(self._generate_random_points)) |
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self.action_save_point_configuration.triggered.connect( |
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self._save_points_file) |
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self.action_load_point_configuration.triggered.connect( |
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self._open_points_file) |
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self.action_exit.triggered.connect(self._close_event) |
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# Override handler for mouse press so we can draw points based on |
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# the OpenGL coordinate system inside of the OpenGL Widget. |
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self.opengl_widget.mousePressEvent = self._ogl_click_dispatcher |
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self.opengl_widget.mouseMoveEvent = self._ogl_click_dispatcher |
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self.opengl_widget.mouseReleaseEvent = self._ogl_click_dispatcher |
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# Voronoi flag so it does not continue to run |
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self.voronoi_solved = False |
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# ----------------------------------------------------------------- |
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# Mode changers - these will be used to signal the action in the |
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# OpenGL Widget. |
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# ----------------------------------------------------------------- |
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def _off_mode(self): |
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self._mode = Mode.OFF |
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self.opengl_widget.setCursor(QCursor(Qt.CursorShape.ArrowCursor)) |
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self.status_bar.showMessage('') |
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clear_selection() |
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self.opengl_widget.update() |
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def _add_points(self): |
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self._mode = Mode.ADD |
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self.opengl_widget.setCursor(QCursor(Qt.CursorShape.CrossCursor)) |
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self.status_bar.showMessage('ADD MODE') |
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clear_selection() |
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self.opengl_widget.update() |
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def _edit_points(self): |
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self._mode = Mode.EDIT |
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self.opengl_widget.setCursor(QCursor(Qt.CursorShape.CrossCursor)) |
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self.status_bar.showMessage('EDIT MODE') |
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clear_selection() |
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self.opengl_widget.update() |
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def _delete_points(self): |
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self._mode = Mode.DELETE |
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self.opengl_widget.setCursor(QCursor( |
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Qt.CursorShape.PointingHandCursor)) |
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self.status_bar.showMessage('DELETE MODE') |
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clear_selection() |
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self.opengl_widget.update() |
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def _move_points(self): |
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self._mode = Mode.MOVE |
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self.opengl_widget.setCursor(QCursor(Qt.CursorShape.SizeAllCursor)) |
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self.status_bar.showMessage('MOVE MODE - PRESS ESC OR SWITCH MODES ' + |
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'TO CANCEL SELECTION') |
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clear_selection() |
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self.opengl_widget.update() |
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def _clear_canvas(self): |
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self._reset() |
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PointManager.point_set.clear_points() |
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refresh_point_list(self) |
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self.opengl_widget.update() |
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def _voronoi(self): |
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if len(list(PointManager.point_set.points)) == 0: |
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error_dialog = QErrorMessage() |
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error_dialog.showMessage('Place points before generating the voronoi diagram.') |
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error_dialog.exec_() |
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return |
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clear_selection() |
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self._mode = Mode.VORONOI |
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self.opengl_widget.setCursor(QCursor(Qt.CursorShape.ArrowCursor)) |
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self.status_bar.showMessage('VORONOI DIAGRAM') |
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self.opengl_widget.update() |
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def _reset(self): |
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self._off_mode() |
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self.voronoi_button.setEnabled(False) |
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self.voronoi_solved = False |
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PointManager.voronoi_regions = [] |
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for point in PointManager.point_set.points: |
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point.weight = 1.0 |
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reset_colors() |
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def _generate_random_points(self): |
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value, ok = QInputDialog.getInt(self, 'Number of Points', |
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'Number of Points:', 30, 30, 3000, 1) |
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if ok: |
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self._mode = Mode.ADD |
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generate_random_points(value, |
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(self._viewport_width - self._point_size), |
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(self._viewport_height - self._point_size) |
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) |
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self._mode = Mode.OFF |
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self.opengl_widget.update() |
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refresh_point_list(self) |
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def _voronoi_enabled(self): |
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point_count = len(list(PointManager.point_set.points)) |
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self.voronoi_button.setEnabled(point_count > 0) |
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@property |
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def mode(self): |
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"""" |
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Function designed to be used from a context |
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to get the current mode. |
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""" |
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return self._mode |
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@mode.setter |
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def mode(self, mode): |
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self._mode = mode |
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def _close_event(self, event): |
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import sys |
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sys.exit(0) |
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def _open_points_file(self): |
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ofile, _ = QFileDialog.getOpenFileName(self, |
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'Open Point Configuration', |
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'', |
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'JSON files (*.json)') |
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if ofile: |
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self._mode = Mode.LOADED |
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PointManager.load(ofile) |
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self.opengl_widget.update() |
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refresh_point_list(self) |
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def _save_points_file(self): |
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file_name, _ = (QFileDialog. |
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getSaveFileName(self, |
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'Save Point Configuration', |
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'', |
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'JSON Files (*.json)')) |
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if file_name: |
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PointManager.save(file_name) |
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@handle_exceptions |
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def _ogl_click_dispatcher(self, event): |
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""" |
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Mode dispatcher for click actions on the OpenGL widget. |
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""" |
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# Map from Mode -> function |
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# where the function is a handler for the |
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# OpenGL event. The context passed to these functions allows |
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# them to modify on screen widgets such as the QOpenGLWidget and |
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# QListWidget. |
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self._voronoi_enabled() |
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MODE_HANDLER_MAP[self._mode](self, event)
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