#! /usr/bin/env python

# This software is distributed according to the terms of the Gnu General
# Public License. See http://www.gnu.org for more information. This software
# comes with no warranty whatsoever, implied or otherwise.


import sys
from qt import *
from qtcanvas import *

#------------------------------------------------------------------------------#
class CanvasWidget(QWidget):

    def __init__(self, *args):
        apply(QWidget.__init__, (self, ) + args)

        self.canvas = Canvas(self)
        self.canvas.resize(555, 553)

        self.view = CanvasView(self.canvas, self)
        self.view.resize(559, 557)
#------------------------------------------------------------------------------#
class Canvas(QCanvas):

    def __init__(self, *args):
        apply(QCanvas.__init__, (self, ) + args)

        self.setBackgroundPixmap(QPixmap("satellite.jpg"))
#------------------------------------------------------------------------------#
class CanvasView(QCanvasView):
    
    def __init__(self, *args):
        apply(QCanvasView.__init__, (self, ) + args)
        self.rectangles = []
        self.pen = QPen(Qt.red, 1)
        self.selRect = None
        self.maxRect = None

    def contentsMousePressEvent(self, ev):
        colliders = self.canvas().collisions(ev.pos())
        if (len(colliders) > 0): 
            self.selectRect(colliders[0])
        else:

            # to prevent overlapping slices, we define a rectangular area whose
            # edges are the farthest the new rectangle can extend in any
            # direction.  the area contains the clicked point and is defined by
            # the edges of all existing slices.
            maxRect = QCanvasRectangle(0, 0,
                                       self.canvas().width(),
                                       self.canvas().height(),
                                       self.canvas())
#            for rect in self.rectangles:
                

            self.selRect = None
            self.newRect = QCanvasRectangle(self.canvas())
            self.newRect.move(ev.x(), ev.y())
            self.newRect.setPen(self.pen)

    def contentsMouseMoveEvent(self, ev):
        # don't draw if click is in an existing rectangle
        if (self.selRect is not None):
            return

        # everything's kosher; draw the rectangle
        w = ev.x() - self.newRect.x()
        h = ev.y() - self.newRect.y()
        self.newRect.setSize(w, h)
        self.rectangles.append(self.newRect)
        self.newRect.show()
        self.canvas().update()

    def selectRect(self, rect):
        self.selRect = rect
#------------------------------------------------------------------------------#
def main(args):
    app = QApplication(args)
    cw = CanvasWidget()
    cw.resize(700, 650)
    app.setMainWidget(cw)
    cw.show()
    app.exec_loop()
#------------------------------------------------------------------------------#
main(sys.argv)