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linjal.py
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linjal.py
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import sys
from PyQt4.QtCore import Qt
from PyQt4.QtGui import (qApp, QAction, QActionGroup, QApplication,
QKeySequence, QMainWindow, QStyle)
from canvas import Canvas, PenTool, SelectTool
WINDOW_WIDTH = 640
WINDOW_HEIGHT = 400
def center_widget_on_desktop(widget):
widget.setGeometry(QStyle.alignedRect(Qt.LeftToRight,
Qt.AlignCenter,
widget.size(),
qApp.desktop().availableGeometry()))
class MainWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self._create_actions()
self._create_toolbar()
self._canvas = Canvas()
self._canvas.scale(16, 16)
self.setCentralWidget(self._canvas)
def _create_actions(self):
self._delete_action = QAction("Delete", None)
self._delete_action.setShortcuts(QKeySequence.Delete)
self._delete_action.triggered.connect(self._delete)
self._select_action = QAction("Select", None)
self._select_action.setCheckable(True)
self._select_action.triggered.connect(self._use_select_tool)
self._pen_action = QAction("Pen", None)
self._pen_action.setCheckable(True)
self._pen_action.setChecked(True)
self._pen_action.triggered.connect(self._use_pen_tool)
self._new_shape_action = QAction("New Shape", None)
self._new_shape_action.triggered.connect(self._new_shape)
self._tool_group = QActionGroup(None)
self._tool_group.addAction(self._select_action)
self._tool_group.addAction(self._pen_action)
def _create_toolbar(self):
toolbar = self.addToolBar("Tools")
toolbar.addAction(self._delete_action)
toolbar.addAction(self._select_action)
toolbar.addAction(self._pen_action)
toolbar.addAction(self._new_shape_action)
def _use_select_tool(self):
self._canvas.use_tool(SelectTool)
def _use_pen_tool(self):
self._canvas.use_tool(PenTool)
def _new_shape(self):
self._canvas.new_shape()
def _delete(self):
self._canvas.delete_selection()
if __name__ == '__main__':
app = QApplication(sys.argv)
main_window = MainWindow()
main_window.resize(WINDOW_WIDTH, WINDOW_HEIGHT)
center_widget_on_desktop(main_window)
main_window.show()
app.setActiveWindow(main_window) # Fixes some GC issue when closing the window
app.exec_()