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path: root/pysamples/push_mouse_event.py
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#Copyright (c) 2009-10, Walter Bender, Tony Forster

#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:

#The above copyright notice and this permission notice shall be included in
#all copies or substantial portions of the Software.

#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#THE SOFTWARE.

#
# This procedure is invoked when the user-definable block on the "extras"
# palette is selected.

# Usage: Import this code into a Python (user-definable) block; when
# this code is run, the current mouse status will be pushed to the
# FILO heap. If a mouse button event occurs, a y, x, and 1 are pushed
# to the heap. If no button is pressed, 0 is pushed to the heap.

# To use these data, pop the heap in a compare block to determine if a
# button has been pushed. If a 1 was popped from the heap, pop the x
# and y coordinates.


def myblock(tw, x):  # ignore second argument

    ###########################################################################
    #
    # Push mouse event to stack
    #
    ###########################################################################

    if tw.mouse_flag == 1:
        # push y first so x will be popped first
        tw.lc.heap.append((tw.canvas.height / 2) - tw.mouse_y)
        tw.lc.heap.append(tw.mouse_x - (tw.canvas.width / 2))
        tw.lc.heap.append(1) # mouse event
        tw.mouse_flag = 0
    else:
        tw.lc.heap.append(0) # no mouse event