def __init__(self, *args):
self.canvas_width = 2
self.canvas_height = 2
self.need_transform = False
self.cache_pixmap = QtGui.QPixmap()
self.xMajorTick = np.array([])
self.xMinorTick = np.array([])
self.yMajorTick = np.array([])
self.yMinorTick = np.array([])
self.background = CanvasBackground()
class Grid:
def __init__(self, *args):
self.canvas_width = 2
self.canvas_height = 2
self.need_transform = False
self.cache_pixmap = QtGui.QPixmap()
self.xMajorTick = np.array([])
self.xMinorTick = np.array([])
self.yMajorTick = np.array([])
self.yMinorTick = np.array([])
self.background = CanvasBackground()
def setGrid(self, xMajorTick, xMinorTick, yMajorTick, yMinorTick):
self.xMajorTick = xMajorTick
self.xMinorTick = xMinorTick
self.yMajorTick = yMajorTick
self.yMinorTick = yMinorTick
self.need_transform = True
def drawToCache(self, painter, xMap, yMap, rect):
w = rect.width()
h = rect.height()
xMajorTick = xMap.toScreen(self.xMajorTick)
xMinorTick = xMap.toScreen(self.xMinorTick)
yMajorTick = h - yMap.toScreen(self.yMajorTick)
yMinorTick = h - yMap.toScreen(self.yMinorTick)
self.cache_pixmap = QtGui.QPixmap(w, h)
self.cache_pixmap.fill(QtCore.Qt.transparent)
painter = QtGui.QPainter(self.cache_pixmap)
self.background.directDraw(painter, rect)
painter.setPen(QtGui.QPen(QtGui.QColor(QtCore.Qt.gray)))
for x in xMajorTick:
painter.drawLine(x, 0, x, h)
painter.setPen(QtGui.QPen(QtGui.QColor(QtCore.Qt.lightGray)))
for x in xMinorTick:
painter.drawLine(x, 0, x, h)
painter.setPen(QtGui.QPen(QtGui.QColor(QtCore.Qt.gray)))
for y in yMajorTick:
painter.drawLine(0, y, w, y)
# given the usual aspect ratio of the canvas, the vertical minor ticks would make it look crowded
# painter.setPen(QtGui.QPen(QtGui.QColor(QtCore.Qt.lightGray)))
# for y in yMinorTick:
# painter.drawLine(0, y, w, y)
def draw(self, painter, xMap, yMap, rect):
# update the cache according to possibly new canvas dimensions
h = rect.height()
w = rect.width()
if w != self.canvas_width:
self.canvas_width = w
self.need_transform = True
if h != self.canvas_height:
self.canvas_height = h
self.need_transform = True
if self.need_transform:
self.drawToCache(painter, xMap, yMap, rect)
self.need_transform = False
painter.drawPixmap(0, 0, self.cache_pixmap)