roar/libtools/ToolLine.py

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#!/usr/bin/env python3
#
# ToolLine.py
# Copyright (c) 2018, 2019 Lucio Andrés Illanes Albornoz <lucio@lucioillanes.de>
#
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from Tool import Tool
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class ToolLine(Tool):
name = "Line"
TS_NONE = 0
TS_ORIGIN = 1
# {{{ _getLine(self, brushColours, brushSize, dispatchFn, eventDc, isCursor, originPoint, targetPoint)
def _getLine(self, brushColours, brushSize, dispatchFn, eventDc, isCursor, originPoint, targetPoint):
dirty = False
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originPoint, targetPoint = originPoint.copy(), targetPoint.copy()
pointDelta = self._pointDelta(originPoint, targetPoint)
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lineXSign = 1 if pointDelta[0] > 0 else -1; lineYSign = 1 if pointDelta[1] > 0 else -1;
pointDelta = [abs(a) for a in pointDelta]
if pointDelta[0] > pointDelta[1]:
lineXX, lineXY, lineYX, lineYY = lineXSign, 0, 0, lineYSign
else:
lineXX, lineXY, lineYX, lineYY = 0, lineYSign, lineXSign, 0
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pointDelta = [pointDelta[1], pointDelta[0]]
lineD = 2 * pointDelta[1] - pointDelta[0]; lineY = 0;
for lineX in range(pointDelta[0] + 1):
for brushStep in range(brushSize[0]):
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patch = [ \
originPoint[0] + lineX * lineXX + lineY * lineYX + brushStep, \
originPoint[1] + lineX * lineXY + lineY * lineYY, \
*brushColours, 0, " "]
if isCursor:
dispatchFn(eventDc, False, patch); dispatchFn(eventDc, True, patch);
else:
if not dirty:
dirty = True
dispatchFn(eventDc, True, patch)
if lineD > 0:
lineD -= pointDelta[0]; lineY += 1;
lineD += pointDelta[1]
return dirty
# }}}
# {{{ _pointDelta(self, a, b)
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def _pointDelta(self, a, b):
return [a2 - a1 for a1, a2 in zip(a, b)]
# }}}
# {{{ _pointSwap(self, a, b)
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def _pointSwap(self, a, b):
return [b, a]
# }}}
#
# onMouseEvent(self, atPoint, brushColours, brushPos, brushSize, canvas, dispatchFn, eventDc, keyModifiers, mapPoint, mouseDragging, mouseLeftDown, mouseRightDown)
def onMouseEvent(self, atPoint, brushColours, brushPos, brushSize, canvas, dispatchFn, eventDc, keyModifiers, mapPoint, mouseDragging, mouseLeftDown, mouseRightDown):
brushColours, dirty = brushColours.copy(), False
if mouseLeftDown:
brushColours[1] = brushColours[0]
elif mouseRightDown:
brushColours[0] = brushColours[1]
else:
brushColours[1] = brushColours[0]
if self.toolState == self.TS_NONE:
if mouseLeftDown or mouseRightDown:
self.toolColours, self.toolOriginPoint, self.toolState = brushColours, list(mapPoint), self.TS_ORIGIN
dispatchFn(eventDc, True, [*mapPoint, *brushColours, 0, " "])
elif self.toolState == self.TS_ORIGIN:
originPoint, targetPoint = self.toolOriginPoint, list(mapPoint)
dirty = self._getLine(self.toolColours, brushSize, dispatchFn, eventDc, mouseLeftDown or mouseRightDown, originPoint, targetPoint)
if mouseLeftDown or mouseRightDown:
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self.toolColours, self.toolOriginPoint, self.toolState = None, None, self.TS_NONE
else:
return False, dirty
return True, dirty
# __init__(self, *args): initialisation method
def __init__(self, *args):
super().__init__(*args)
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self.toolColours, self.toolOriginPoint, self.toolState = None, None, self.TS_NONE
# vim:expandtab foldmethod=marker sw=4 ts=4 tw=120