Method drawBaselines

Lib/pagebot/elements/views/pageview.py:934–1064

Draw baseline grid if self.showBaselineGrid is True and there is a baseline defined > 0. Use the color from style values viewGridStrokeX and viewGridStrokeWidthX to make a difference with the baselines drawn by Text with style values baselineColor and baselineWidth.

(self, e, origin, background=False)

                    x += cw + gx

    def drawBaselines(self, e, origin, background=False):
        """Draw baseline grid if self.showBaselineGrid is True and there is a
        baseline defined > 0. Use the color from style values viewGridStrokeX
        and viewGridStrokeWidthX to make a difference with the baselines drawn
        by Text with style values baselineColor and baselineWidth.

        In this method is called by an element, instead of self, the show
        attribute is a way to overwrite the setting of self.showBaselineGrid

        NOTE: Text elements have their own baseline drawing method.

        >>> from pagebot import getContext
        >>> context = getContext()
        >>> from pagebot.elements.element import Element
        >>> from pagebot.style import getRootStyle
        >>> from pagebot.document import Document
        >>> style = getRootStyle() # Get default values
        >>> e = Element(style=style) # Works on generic elements as well as pages.
        >>> doc = Document(name='TestDoc', startPage=50, autoPages=100, context=context)
        >>> pages = doc.pages
        >>> len(pages)
        100
        >>> page = doc[50]
        >>> page
        <Page #50 default (1000pt, 1000pt)>
        >>> view = doc.view
        >>> view = PageView(context=context, style=style)
        >>> view.showBaselineGrid = [BASE_LINE, BASE_INDEX_LEFT, BASE_Y_LEFT]
        >>> #view.drawBaselines(e, pt(0, 0))
        >>> doc.build()
        """
        show = e.showBaselineGrid or self.showBaselineGrid

        # Sets the default, in case not drawing or show is True.
        if not show:
            return

        context = self.context
        p = pointOffset(e.origin, origin)
        p = self._applyScale(e, p)

        # Ignore z-axis for now.
        px, py, _ = e._applyAlignment(p)

        # Get the baseline grid of this element.
        baselineGrid = e.baselineGrid

        # Index size depends on baseline.
        indexFontSize = max(9, min(16, baselineGrid*0.5))

        # Gutter between index marker and element padding
        indexGutter = baselineGrid/4

        # Collect all baseline positions on e.
        baselineYs = []

        # Page origin is at the bottom.
        startY = e.h - (e.baselineGridStart or e.pt)