Method drawBaselines

Lib/pagebot/elements/views/mapview.py:715–813

Draws 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):
        """Draws 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.

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

        >>> from pagebot import getContext
        >>> context = getContext()
        >>> from pagebot.elements.element import Element
        >>> from pagebot.style import getRootStyle
        >>> from pagebot.elements.views.pageview import PageView
        >>> style = getRootStyle() # Get default values
        >>> #style['font'] = 'PageBot-Regular'
        >>> #style = dict(font='PageBot-Regular', baselineGrid=1)
        >>> e = Element(style=style) # Works on generic elements as well as pages.
        >>> view = PageView(context=context, style=style)
        >>> view.showBaselineGrid = [BASE_LINE, BASE_INDEX_LEFT, BASE_Y_LEFT]
        >>> view.drawBaselines(e, pt(0, 0))
        """
        show = e.showBaselineGrid or self.showBaselineGrid

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

        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

        startY = e.baselineGridStart
        if startY is None:
            # Otherwise use the top padding as start Y.
            startY = e.pt

        # Assumes origin at bottom for self.context drawing.
        oy = e.h - startY

        line = 0 # Line index
        baselineColor = e.css('baselineColor', color(0,7))
        baselineWidth = e.css('baselineWidth', 0.5)

        # Format of line numbers.
        style = dict(font=e.css('viewMarkerFont'), xTextAlign=RIGHT,
            fontSize=indexFontSize, stroke=noColor, textFill=baselineColor)
        self.context.fill(noColor)
        self.context.stroke(baselineColor, baselineWidth)