cairo

问题 I have an application written in C using GTK (although the language is probably unimportant for this question). This application has a fullscreen gtk_window with a single gtk_drawing_area . For the drawing area, I have registered a tick callback via gtk_widget_add_tick_callback which just calls gtk_widget_queue_draw every tick. Inside the drawing area draw callback, I change the color of the entire window at regular intervals (e.g., from black to white at 1Hz). Say that in this call to the

问题 I wanted to use cairo library for c++ graphics. I included the libraries using sudo apt-get install libcairo2-dev and further I installed GLX-Dock(Cairo Dock with OpenGL) using Ubuntu open software center and used the code in http://cairographics.org/FAQ/ and compiled with command g++ trial.cpp but it gives me the following error fatal error: cairo.h: No such file or directory compilation terminated. How should i compile and run the file? Moreover can someone recommend easy to learn graphics

问题 Objective: I would like to display a generated .png image using a template. I worked with the example here. Here is the final snippet of code from that example: def gen_chart(request): ... pp = CairoPlot.PiePlot(surface, data, heigth, width, background = None, gradient = True, shadow = True, series_colors = colors ) pp.render() response = HttpResponse(mimetype="image/png") pp.surface.write_to_png(response) return response Accessing the gen_chart view shows a pretty pie chart. However, I'd

问题 In my program, even if do all the obvious housekeeping, such as calling cairo_destroy() , cairo_surface_destroy() ..., valgrind always finds memory leaks, the leaks are in cairo dependencies ( freetype , pixman , ...). How do I cleanup after cairo , so that valgrind won't detect any leaks, or are the leaks normal? Sample output ==1861== HEAP SUMMARY: ==1861== in use at exit: 1,996,663 bytes in 532 blocks ==1861== total heap usage: 21,915 allocs, 21,383 frees, 95,411,698 bytes allocated ==1861

问题 For some reason I can't get python to find cairo. When I did ./waf configure I got Setting top to : /home/user/pycairo/py2cairo-1.10.0 Setting out to : /home/user/pycairo/py2cairo-1.10.0/build_directory ./configure() Checking for 'gcc' (c compiler) : ok Checking for program python : /usr/bin/python Checking for python version : (2, 7, 2, 'final', 0) Checking for library python2.7 : yes Checking for program python2.7-config : /usr/bin/python2.7-config Checking for header Python.h : yes

问题 The simplest example. We create a window by means of Gtk, we add there area for drawing of Gtk.DrawingArea and on it we draw the text by means of Cairo. Example: #!/usr/bin/env python from gi.repository import Gtk import cairo class MyWindow (Gtk.Window): def __init__(self): Gtk.Window.__init__(self, title='MyWindow') darea = Gtk.DrawingArea() darea.connect('draw', self.on_draw) self.add(darea) def on_draw(self, widget, ctx): ctx.set_source_rgb(0, 0, 0) ctx.select_font_face("Sans", cairo.FONT

问题 i am trying to install pycairo 1.10.0 for use with my custom-build python 3.1. however, sudo /flower/bin/easy_install-3.1 pycairo fails with XXX@XXXX:/adventures$ sudo /flower/bin/easy_install-3.1 pycairo install_dir /flower/lib/python3.1/site-packages/ Searching for pycairo Reading http://pypi.python.org/simple/pycairo/ Reading http://cairographics.org/pycairo Best match: pycairo 1.10.0 Downloading http://cairographics.org/releases/pycairo-1.10.0.tar.bz2 Processing pycairo-1.10.0.tar.bz2

问题 I am trying to install the pycairo (Python bindings for the cairo graphics library) under OSX. I started with easy_install pycairo and got: Requested 'cairo >= 1.8.8' but version of cairo is 1.0.4 error: Setup script exited with Error: cairo >= 1.8.8 not found So I went to cairo's site and downloaded the latest package (1.8.8) of cairo, and also the latest package of something called pixman (both source packages -- couldn't find osx binaries) unzipped both, each in own directory. for pixman,

问题 On RedHat OpenShift servers it is not possible to compile node.js module canvas, because there are missing cairo libraries for the linux, and related required libraries as well. 回答1: This is how to make it compile: export PATH=/sbin:$PATH:$OPENSHIFT_DATA_DIR/usr/local/bin export LD_LIBRARY_PATH=$OPENSHIFT_DATA_DIR/usr/local/lib:/opt/rh/nodejs010/root/usr/lib64:$LD_LIBRARY_PATH export PKG_CONFIG_PATH=$OPENSHIFT_DATA_DIR/usr/local/lib/pkgconfig cd $OPENSHIFT_DATA_DIR curl -L http://sourceforge

问题 After upgrading gnuplot from 4.6 to 5.0.1 , I encounter the following error: set terminal pdfcairo size 3.0in,2.25in font ',8' ^ "plot.plt", line 114: unknown or ambiguous terminal type; type just 'set terminal' for a list How can I fix it? PS: pdfcairo works fine in the previous version (4.6). I install the gnuplot by the following command: #build it: ./configure --with-cairo make #install it: sudo make install As described in GNUPLOT Version 5.0.1 Release Notes, the pdfcairo is included by