python类DotLine()的实例源码

def _add_crosshair(self):
        """
        Adds vertical, horizontal and diagonal crosshairs to the graphic scene
        """
        pen = QPen(self.crosshair_line_color)
        pen.setWidth(self.line_width)
        pen.setStyle(Qt.DotLine)
        width, height = self.width(), self.height()
        mx, my = self._get_middle()

        # horizontal
        self.scene.addLine(0, my, width, my, pen=pen)
        # vertical
        self.scene.addLine(mx, 0, mx, height, pen=pen)
        # 45°
        self.scene.addLine(0, 0, width, height, pen=pen)
        self.scene.addLine(width, 0, 0, height, pen=pen)

def drawGlyphBackground(self, painter, glyph, rect, selected=False):
        if glyph.name == ".notdef":
            painter.fillRect(QRectF(*rect), self._notdefBackgroundColor)
        if selected:
            if self._glyphSelectionColor is not None:
                selectionColor = self._glyphSelectionColor
            else:
                palette = self.palette()
                active = palette.currentColorGroup() != QPalette.Inactive
                opacityMultiplier = platformSpecific.colorOpacityMultiplier()
                selectionColor = palette.color(QPalette.Highlight)
                selectionColor.setAlphaF(
                    .2 * opacityMultiplier if active else .9)
            xMin, yMin, width, height = rect
            painter.save()
            if self._drawMetrics:
                pen = painter.pen()
                pen.setStyle(Qt.DotLine)
                pen.setColor(self._metricsColor)
                painter.setPen(pen)
                drawing.drawLine(painter, xMin, yMin, xMin, yMin + height)
                drawing.drawLine(
                    painter, xMin + width, yMin, xMin + width, yMin + height)
            painter.fillRect(xMin, yMin, width, -26, selectionColor)
            painter.restore()

def _add_circles(self, n, add_text_labels=True):
        """
        Adds n circles to the graphic scene.
        :param n: the number of circles
        """
        pen = QPen(self.circle_line_color)
        pen.setStyle(Qt.DotLine)
        pen.setWidth(self.line_width)
        width, height = self.width(), self.height()
        stepw, steph = width/n, height/n
        mx, my = self._get_middle()

        for i in range(1, n+1):
            w, h = width - i * stepw, height - i * steph
            self.scene.addEllipse((width-w)/2, (height-h)/2, w, h, pen)

            if add_text_labels:
                text = QGraphicsTextItem()
                text.setDefaultTextColor(self.text_label_color)
                text.setPlainText(str(int(w/2)))
                text.setPos(mx+w/2.0, my)

                text2 = QGraphicsTextItem()
                text2.setDefaultTextColor(self.text_label_color)
                text2.setPlainText(str(int(-w / 2)))
                text2.setPos(mx - w / 2.0, my)

                self.scene.addItem(text)
                self.scene.addItem(text2)