[cairo] connecting lines

Donn donn.ingle at gmail.com
Wed Nov 7 11:02:24 PST 2007


Hi, can't reply to my own post since I don't see it courtesy of gmail :(

I reproduced the error, here is some code. I'm sure I'm being thick, which is 
par for the course :)

There should be no line between the arc and the text.
/d

#! /usr/bin/env python
import pygtk
pygtk.require('2.0')
import gtk, gobject, cairo
import math

# Create a GTK+ widget on which we will draw using Cairo
class Screen(gtk.DrawingArea):

    # Draw in response to an expose-event
    __gsignals__ = { "expose-event": "override" }

    # Handle the expose-event by drawing
    def do_expose_event(self, event):

        # Create the cairo context
        cr = self.window.cairo_create()

        # Restrict Cairo to the exposed area; avoid extra work
        cr.rectangle(event.area.x, event.area.y,
                event.area.width, event.area.height)
        cr.clip()

        self.draw(cr, *self.window.get_size())

    def draw(self, cr, width, height):
        # Fill the background with gray
        cr.set_source_rgb(0.5, 0.5, 0.5)
        cr.rectangle(0, 0, width, height)
        cr.fill()

# GTK mumbo-jumbo to show the widget in a window and quit when it's closed
def run(Widget):
    window = gtk.Window()
    window.set_size_request(400, 400)
    window.connect("delete-event", gtk.main_quit)
    widget = Widget()
    widget.show()
    window.add(widget)
    window.present()
    gtk.main()

#######################
## Do all your testing in Shapes ##
#######################

class Shapes(Screen):
    def draw(self, cr, width, height):
        ctx = cr
        
        matrix = cairo.Matrix(1,0,0,1,200, 200)
        ctx.transform(matrix)
        
        ctx.save()
        print "##Draw Square"
        
        ctx.set_source_rgb(1, 0, 0)
        ctx.rectangle(0, 0, 50, 50)
        ctx.fill()

        ctx.set_source_rgb(0.0, 0.0, 0.0)
        ctx.select_font_face("",
        cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_BOLD)
        ctx.set_font_size(128)
        x_bearing, y_bearing, width, height =ctx.text_extents("a")[:4]
        ctx.move_to(-120 - x_bearing, -120 - y_bearing)
        ctx.show_text("15")

        print "##Draw Circle"
        
        ctx.arc(0,0, 25, 0, 2.0 * math.pi)
        ctx.set_source_rgb(1, 0, 1)
        ctx.fill_preserve()
        ctx.set_source_rgb(0, 0, 0)
        ctx.stroke()

        ctx.set_source_rgb(1, 10, 0)
        ctx.rectangle(-10, -10, 10, 10)        
        ctx.fill()



    
    
        ctx.restore()
run(Shapes)


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