#!/bin/env python

__doc__='testscript for reportlab.pdfgen'

#tests and documents new low-level canvas

import string

from reportlab.pdfgen import canvas   # gmcm 2000/10/13, pdfgen now a package

from reportlab.lib.units import inch, cm

from reportlab.lib import colors

#################################################################

#

#  first some drawing utilities

#

#

################################################################

BASEFONT = ('Times-Roman', 10)

def framePageForm(c):

    c.beginForm("frame")

    c.saveState()

    # forms can't do non-constant operations

    #canvas.setFont('Times-BoldItalic',20)

    #canvas.drawString(inch, 10.5 * inch, title)

    #c.setFont('Times-Roman',10)

    #c.drawCentredString(4.135 * inch, 0.75 * inch,

    #                        'Page %d' % c.getPageNumber())

    #draw a border

    c.setFillColorRGB(0,0,0.95)

    c.rect(0.3*inch, inch, 0.5*inch, 10*inch, fill=1)

    from reportlab.lib import corp

    c.translate(0.8*inch, 9.6*inch)

    c.rotate(90)

    logo = corp.ReportLabLogo(width=1.3*inch, height=0.5*inch, powered_by=1)

    c.setFillColorRGB(1,1,1)

    c.setStrokeColorRGB(1,1,1)

    logo.draw(c)

    #c.setStrokeColorRGB(1,0,0)

    #c.setLineWidth(5)

    #c.line(0.8 * inch, inch, 0.8 * inch, 10.75 * inch)

    #reset carefully afterwards

    #canvas.setLineWidth(1)

    #canvas.setStrokeColorRGB(0,0,0)\

    c.restoreState()

    c.endForm()

titlelist = []

closeit = 0

def framePage(canvas, title):

    global closeit

    titlelist.append(title)

    #canvas._inPage0()  # do we need this at all?  would be good to eliminate it

    canvas.saveState()

    canvas.setFont('Times-BoldItalic',20)

    canvas.drawString(inch, 10.5 * inch, title)

    canvas.bookmarkHorizontalAbsolute(title, 10.8*inch)

    #newsection(title)

    canvas.addOutlineEntry(title+" section", title, level=0, closed=closeit)

    closeit = not closeit # close every other one

    canvas.setFont('Times-Roman',10)

    canvas.drawCentredString(4.135 * inch, 0.75 * inch,

                            'Page %d' % canvas.getPageNumber())

    canvas.restoreState()

    canvas.doForm("frame")

def makesubsection(canvas, title, horizontal):

    canvas.bookmarkHorizontalAbsolute(title, horizontal)

    #newsubsection(title)

    canvas.addOutlineEntry(title+" subsection", title, level=1)

# outline helpers

#outlinenametree = []

#def newsection(name):

#    outlinenametree.append(name)

#def newsubsection(name):

#    from types import TupleType

#    thissection = outlinenametree[-1]

#    if type(thissection) is not TupleType:

#        subsectionlist = []

#        thissection = outlinenametree[-1] = (thissection, subsectionlist)

#    else:

#        (sectionname, subsectionlist) = thissection

#    subsectionlist.append(name)

class DocBlock:

    """A DocBlock has a chunk of commentary and a chunk of code.

    It prints the code and commentary, then executes the code,

    which is presumed to draw in a region reserved for it.

    """

    def __init__(self):

        self.comment1 = "A doc block"

        self.code = "canvas.setTextOrigin(cm, cm)\ncanvas.textOut('Hello World')"

        self.comment2 = "That was a doc block"

        self.drawHeight = 0

    def _getHeight(self):

        "splits into lines"

        self.comment1lines = string.split(self.comment1, '\n')

        self.codelines = string.split(self.code, '\n')

        self.comment2lines = string.split(self.comment2, '\n')

        textheight = (len(self.comment1lines) +

                len(self.code) +

                len(self.comment2lines) +

                18)

        return max(textheight, self.drawHeight)

    def draw(self, canvas, x, y):

        #specifies top left corner

        canvas.saveState()

        height = self._getHeight()

        canvas.rect(x, y-height, 6*inch, height)

        #first draw the text

        canvas.setTextOrigin(x + 3 * inch, y - 12)

        canvas.setFont('Times-Roman',10)

        canvas.textLines(self.comment1)

        drawCode(canvas, self.code)

        canvas.textLines(self.comment2)

        #now a box for the drawing, slightly within rect        

        canvas.rect(x + 9, y - height + 9, 198, height - 18)

        #boundary:

        self.namespace = {'canvas':canvas,'cm': cm,'inch':inch}

        canvas.translate(x+9, y - height + 9)

        codeObj = compile(self.code, '<sample>','exec')

        exec codeObj in self.namespace

        canvas.restoreState()

def drawAxes(canvas, label):

    """draws a couple of little rulers showing the coords -

    uses points as units so you get an imperial ruler

    one inch on each side"""

    #y axis

    canvas.line(0,0,0,72)

    for y in range(9):

        tenths = (y+1) * 7.2

        canvas.line(-6,tenths,0,tenths)

    canvas.line(-6, 66, 0, 72)  #arrow...

    canvas.line(6, 66, 0, 72)  #arrow...

    canvas.line(0,0,72,0)

    for x in range(9):

        tenths = (x+1) * 7.2

        canvas.line(tenths,-6,tenths, 0)

    canvas.line(66, -6, 72, 0)  #arrow...

    canvas.line(66, +6, 72, 0)  #arrow...

    canvas.drawString(18, 30, label)

def drawCrossHairs(canvas, x, y):

    """just a marker for checking text metrics - blue for fun"""

    canvas.saveState()

    canvas.setStrokeColorRGB(0,1,0)    

    canvas.line(x-6,y,x+6,y)

    canvas.line(x,y-6,x,y+6)

    canvas.restoreState()

def drawCode(canvas, code):

    """Draws a block of text at current point, indented and in Courier"""

    canvas.addLiteral('36 0 Td')

    canvas.setFillColor(colors.blue)

    canvas.setFont('Courier',10)

    t = canvas.beginText()

    t.textLines(code)

    c.drawText(t)

    canvas.setFillColor(colors.black)

    canvas.addLiteral('-36 0 Td')

    canvas.setFont('Times-Roman',10)

def run():

    c = canvas.Canvas('testpdfgen.pdf')

    framePageForm(c) # define the frame form

    c.showOutline()

    framePage(c, 'PDFgen graphics API test script')

    makesubsection(c, "PDFgen and PIDDLE", 10*inch)

    t = c.beginText(inch, 10*inch)

    t.setFont('Times-Roman', 10)

    drawCrossHairs(c, t.getX(),t.getY())

    t.textLines("""

The ReportLab library permits you to create PDF documents directly from

your Python code. The "pdfgen" subpackage is the lowest level exposed

to the user and lets you directly position test and graphics on the

page, with access to almost the full range of PDF features. 

  The API is intended to closely mirror the PDF / Postscript imaging

model.  There is an almost one to one correspondence between commands

and PDF operators.  However, where PDF provides several ways to do a job,

we have generally only picked one. 

  The test script attempts to use all of the methods exposed by the Canvas

class, defined in reportlab/pdfgen/canvas.py

  First, let's look at text output.  There are some basic commands

to draw strings:

-    canvas.setFont(fontname, fontsize [, leading])

-    canvas.drawString(x, y, text)

-    canvas.drawRightString(x, y, text)

-    canvas.drawCentredString(x, y, text)

The coordinates are in points starting at the bottom left corner of the

page.  When setting a font, the leading (i.e. inter-line spacing)

defaults to 1.2 * fontsize if the fontsize is not provided.

For more sophisticated operations, you can create a Text Object, defined

in reportlab/pdfgen/testobject.py.  Text objects produce tighter PDF, run

faster and have many methods for precise control of spacing and position.

Basic usage goes as follows:

-   tx = canvas.beginText(x, y)

-   tx.textOut('Hello')    # this moves the cursor to the right

-   tx.textLine('Hello again') # prints a line and moves down

-   y = tx.getY()       # getX, getY and getCursor track position

-   canvas.drawText(tx)  # all gets drawn at the end

The green crosshairs below test whether the text cursor is working

properly.  They should appear at the bottom left of each relevant

substring.

""")

    t.setFillColorRGB(1,0,0)

    t.setTextOrigin(inch, 4*inch)

    drawCrossHairs(c, t.getX(),t.getY())

    t.textOut('textOut moves across:')

    drawCrossHairs(c, t.getX(),t.getY())

    t.textOut('textOut moves across:')

    drawCrossHairs(c, t.getX(),t.getY())

    t.textOut('textOut moves across:')

    drawCrossHairs(c, t.getX(),t.getY())

    t.textLine('')

    drawCrossHairs(c, t.getX(),t.getY())

    t.textLine('textLine moves down')

    drawCrossHairs(c, t.getX(),t.getY())

    t.textLine('textLine moves down')

    drawCrossHairs(c, t.getX(),t.getY())

    t.textLine('textLine moves down')

    drawCrossHairs(c, t.getX(),t.getY())

    t.setTextOrigin(4*inch,3.25*inch)

    drawCrossHairs(c, t.getX(),t.getY())

    t.textLines('This is a multi-line\nstring with embedded newlines\ndrawn with textLines().\n')

    drawCrossHairs(c, t.getX(),t.getY())

    t.textLines(['This is a list of strings',

                'drawn with textLines().'])

    c.drawText(t)

    t = c.beginText(2*inch,2*inch)

    t.setFont('Times-Roman',10)

    drawCrossHairs(c, t.getX(),t.getY())

    t.textOut('Small text.')

    drawCrossHairs(c, t.getX(),t.getY())

    t.setFont('Courier',14)

    t.textOut('Bigger fixed width text.')

    drawCrossHairs(c, t.getX(),t.getY())

    t.setFont('Times-Roman',10)

    t.textOut('Small text again.')

    drawCrossHairs(c, t.getX(),t.getY())

    c.drawText(t)

    #mark the cursor where it stopped

    c.showPage()

    ##############################################################

    #

    # page 2 - line styles

    #

    ###############################################################

    #page 2 - lines and styles

    framePage(c, 'Line Drawing Styles')

    # three line ends, lines drawn the hard way

    #firt make some vertical end markers

    c.setDash(4,4)

    c.setLineWidth(0)

    c.line(inch,9.2*inch,inch, 7.8*inch)

    c.line(3*inch,9.2*inch,3*inch, 7.8*inch)

    c.setDash() #clears it

    c.setLineWidth(5)

    c.setLineCap(0)

    p = c.beginPath()

    p.moveTo(inch, 9*inch)

    p.lineTo(3*inch, 9*inch)

    c.drawPath(p)

    c.drawString(4*inch, 9*inch, 'the default - butt caps project half a width')

    makesubsection(c, "caps and joins", 8.5*inch)

    c.setLineCap(1)

    p = c.beginPath()

    p.moveTo(inch, 8.5*inch)

    p.lineTo(3*inch, 8.5*inch)

    c.drawPath(p)

    c.drawString(4*inch, 8.5*inch, 'round caps')

    c.setLineCap(2)

    p = c.beginPath()

    p.moveTo(inch, 8*inch)

    p.lineTo(3*inch, 8*inch)

    c.drawPath(p)

    c.drawString(4*inch, 8*inch, 'square caps')

    c.setLineCap(0)

    # three line joins

    c.setLineJoin(0)

    p = c.beginPath()

    p.moveTo(inch, 7*inch)

    p.lineTo(2*inch, 7*inch)

    p.lineTo(inch, 6.7*inch)

    c.drawPath(p)

    c.drawString(4*inch, 6.8*inch, 'Default - mitered join')

    c.setLineJoin(1)

    p = c.beginPath()

    p.moveTo(inch, 6.5*inch)

    p.lineTo(2*inch, 6.5*inch)

    p.lineTo(inch, 6.2*inch)

    c.drawPath(p)

    c.drawString(4*inch, 6.3*inch, 'round join')

    c.setLineJoin(2)

    p = c.beginPath()

    p.moveTo(inch, 6*inch)

    p.lineTo(2*inch, 6*inch)

    p.lineTo(inch, 5.7*inch)

    c.drawPath(p)

    c.drawString(4*inch, 5.8*inch, 'bevel join')

    c.setDash(6,6)

    p = c.beginPath()

    p.moveTo(inch, 5*inch)

    p.lineTo(3*inch, 5*inch)

    c.drawPath(p)

    c.drawString(4*inch, 5*inch, 'dash pattern 6 points on, 3 off- setDash(6,3)')

    makesubsection(c, "dash patterns", 5*inch)

    c.setDash([1,2,3,4,5,6],0)

    p = c.beginPath()

    p.moveTo(inch, 4.5*inch)

    p.lineTo(3*inch, 4.5*inch)

    c.drawPath(p)

    c.drawString(4*inch, 4.5*inch, 'dash pattern lengths growing - setDash([1,2,3,4,5,6],0)')

    c.setDash()

    c.showPage()

##############################################################

#

# higher level shapes

#

###############################################################

    framePage(c, 'Shape Drawing Routines')

    t = c.beginText(inch, 10*inch)

    t.textLines("""

Rather than making your own paths, you have access to a range of shape routines.

These are built in pdfgen out of lines and bezier curves, but use the most compact

set of operators possible.  We can add any new ones that are of general use at no

cost to performance.""")

    t.textLine()

    #line demo    

    makesubsection(c, "lines", 10*inch)

    c.line(inch, 8*inch, 3*inch, 8*inch)

    t.setTextOrigin(4*inch, 8*inch)

    t.textLine('canvas.line(x1, y1, x2, y2)')

    #bezier demo - show control points

    makesubsection(c, "bezier curves", 7.5*inch)

    (x1, y1, x2, y2, x3, y3, x4, y4) = (

                        inch, 6.5*inch,

                        1.2*inch, 7.5 * inch,

                        3*inch, 7.5 * inch,

                        3.5*inch, 6.75 * inch

                        )

    c.bezier(x1, y1, x2, y2, x3, y3, x4, y4)

    c.setDash(3,3)

    c.line(x1,y1,x2,y2)

    c.line(x3,y3,x4,y4)

    c.setDash()

    t.setTextOrigin(4*inch, 7 * inch)

    t.textLine('canvas.bezier(x1, y1, x2, y2, x3, y3, x4, y4)')

    #rectangle

    makesubsection(c, "rectangles", 7*inch)

    c.rect(inch, 5.25 * inch, 2 * inch, 0.75 * inch)

    t.setTextOrigin(4*inch, 5.5 * inch)

    t.textLine('canvas.rect(x, y, width, height) - x,y is lower left')

    #wedge

    makesubsection(c, "wedges", 5*inch)

    c.wedge(inch, 5*inch, 3*inch, 4*inch, 0, 315)

    t.setTextOrigin(4*inch, 4.5 * inch)

    t.textLine('canvas.wedge(x1, y1, x2, y2, startDeg, extentDeg)')

    t.textLine('Note that this is an elliptical arc, not just circular!')

    #wedge the other way

    c.wedge(inch, 4*inch, 3*inch, 3*inch, 0, -45)

    t.setTextOrigin(4*inch, 3.5 * inch)

    t.textLine('Use a negative extent to go clockwise')

    #circle

    makesubsection(c, "circles", 3.5*inch)

    c.circle(1.5*inch, 2*inch, 0.5 * inch)

    c.circle(3*inch, 2*inch, 0.5 * inch)

    t.setTextOrigin(4*inch, 2 * inch)

    t.textLine('canvas.circle(x, y, radius)')

    c.drawText(t)

##############################################################

#

# Page 4 - fonts

#

###############################################################

    c.showPage()

    framePage(c, "Font Control")

    c.drawString(inch, 10*inch, 'Listing available fonts...')

    y = 9.5*inch

    for fontname in c.getAvailableFonts():

        c.setFont(fontname,24)

        c.drawString(inch, y, 'This should be %s' % fontname)

        y = y - 28

    makesubsection(c, "fonts and colors", 4*inch)

    c.setFont('Times-Roman', 12)

    t = c.beginText(inch, 4*inch)

    t.textLines("""Now we'll look at the color functions and how they interact

    with the text.  In theory, a word is just a shape; so setFillColorRGB()

    determines most of what you see.  If you specify other text rendering

    modes, an outline color could be defined by setStrokeColorRGB() too""")

    c.drawText(t)

    t = c.beginText(inch, 2.75 * inch)

    t.setFont('Times-Bold',36)

    t.setFillColor(colors.green)  #green

    t.textLine('Green fill, no stroke')

    #t.setStrokeColorRGB(1,0,0)  #ou can do this in a text object, or the canvas.

    t.setStrokeColor(colors.red)  #ou can do this in a text object, or the canvas.

    t.setTextRenderMode(2)   # fill and stroke

    t.textLine('Green fill, red stroke - yuk!')

    t.setTextRenderMode(0)   # back to default - fill only

    t.setFillColorRGB(0,0,0)   #back to default

    t.setStrokeColorRGB(0,0,0) #ditto

    c.drawText(t)

#########################################################################

#

#  Page 5 - coord transforms

#

#########################################################################

    c.showPage()

    framePage(c, "Coordinate Transforms")

    c.setFont('Times-Roman', 12)

    t = c.beginText(inch, 10 * inch)

    t.textLines("""This shows coordinate transformations.  We draw a set of axes,

    moving down the page and transforming space before each one.

    You can use saveState() and restoreState() to unroll transformations.

    Note that functions which track the text cursor give the cursor position

    in the current coordinate system; so if you set up a 6 inch high frame

    2 inches down the page to draw text in, and move the origin to its top

    left, you should stop writing text after six inches and not eight.""")

    c.drawText(t)

    drawAxes(c, "0.  at origin")

    c.addLiteral('%about to translate space')

    c.translate(2*inch, 7 * inch)

    drawAxes(c, '1. translate near top of page')

    c.saveState()

    c.translate(1*inch, -2 * inch)

    drawAxes(c, '2. down 2 inches, across 1')

    c.restoreState()

    c.saveState()

    c.translate(0, -3 * inch)

    c.scale(2, -1)

    drawAxes(c, '3. down 3 from top, scale (2, -1)')

    c.restoreState()

    c.saveState()

    c.translate(0, -5 * inch)

    c.rotate(-30)

    drawAxes(c, "4. down 5, rotate 30' anticlockwise")

    c.restoreState()