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[Plplot-cvs] SF.net SVN: plplot:[9822] trunk/examples/c
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From: <ai...@us...> - 2009-04-20 18:26:48
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Revision: 9822
http://plplot.svn.sourceforge.net/plplot/?rev=9822&view=rev
Author: airwin
Date: 2009-04-20 18:26:38 +0000 (Mon, 20 Apr 2009)
Log Message:
-----------
Move contents of cairo directory into parent directory and remove the cairo
subdirectory in preparation for integrating these examples (which
demonstrate how to draw into an externally supplied XDrawable or Cairo
context) into the installed examples build.
Added Paths:
-----------
trunk/examples/c/README.cairo
trunk/examples/c/ext-cairo-test.c
trunk/examples/c/extXdrawable_demo.c
Removed Paths:
-------------
trunk/examples/c/cairo/
Copied: trunk/examples/c/README.cairo (from rev 9819, trunk/examples/c/cairo/README.cairo)
===================================================================
--- trunk/examples/c/README.cairo (rev 0)
+++ trunk/examples/c/README.cairo 2009-04-20 18:26:38 UTC (rev 9822)
@@ -0,0 +1,24 @@
+
+Some examples demonstrating how to use the PLplot and the Cairo driver to draw
+into an externally supplied XDrawable or Cairo context.
+
+EXTERNAL X DRAWABLE EXAMPLES
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The external X drawable example is extXdrawable_demo.c. They are not part
+of the general PLplot testbed of examples, but are instead designed to
+demonstrate the use of the ability of plplot's xcairo driver to use an X
+drawable supplied by an application. The example itself uses GTK but the
+concept applies to any graphical framework, or even programs using libX11
+directly.
+
+
+EXTERNAL CAIRO CONTEXT EXAMPLES
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The C program ext-cairo-test.c demonstrates how to pass in an external
+Cairo Context that PLplot can use for plotting. On unix like systems you
+should be able to compile this as follows:
+
+gcc ext-cairo-test.c -o ext-cairo-test `pkg-config --cflags --libs plplotd cairo`
+
Property changes on: trunk/examples/c/README.cairo
___________________________________________________________________
Added: keywords
+ Author Date Id Revision
Added: svn:mergeinfo
+
Added: eol-style
+ native
Copied: trunk/examples/c/ext-cairo-test.c (from rev 9819, trunk/examples/c/cairo/ext-cairo-test.c)
===================================================================
--- trunk/examples/c/ext-cairo-test.c (rev 0)
+++ trunk/examples/c/ext-cairo-test.c 2009-04-20 18:26:38 UTC (rev 9822)
@@ -0,0 +1,26 @@
+#include <stdio.h>
+
+#include <cairo.h>
+#include <cairo-ps.h>
+
+#include <plplot.h>
+
+int main(int argc, char *argv[])
+{
+ cairo_surface_t *cairoSurface;
+ cairo_t *cairoContext;
+
+ cairoSurface = cairo_ps_surface_create("test.ps", 720, 540);
+ cairoContext = cairo_create(cairoSurface);
+
+ plsdev("extcairo");
+ plinit();
+ pl_cmd(PLESC_DEVINIT, cairoContext);
+ plenv(0.0, 1.0, 0.0, 1.0, 1, 0);
+ pllab("x", "y", "title");
+ plend();
+
+ cairo_destroy(cairoContext);
+ cairo_surface_destroy(cairoSurface);
+}
+
Property changes on: trunk/examples/c/ext-cairo-test.c
___________________________________________________________________
Added: keywords
+ Author Date Id Revision
Added: svn:mergeinfo
+
Added: eol-style
+ native
Copied: trunk/examples/c/extXdrawable_demo.c (from rev 9821, trunk/examples/c/cairo/extXdrawable_demo.c)
===================================================================
--- trunk/examples/c/extXdrawable_demo.c (rev 0)
+++ trunk/examples/c/extXdrawable_demo.c 2009-04-20 18:26:38 UTC (rev 9822)
@@ -0,0 +1,200 @@
+/*
+ A simple GTK application demonstrating the use of the X Drawable
+ functionality of plplot's xcairo driver.
+
+ Copyright (C) 2008 Jonathan Woithe <jw...@ph...>
+
+ This file is part of PLplot.
+
+ PLplot is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Library Public License as published
+ by the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ PLplot is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with PLplot; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+ */
+
+/* Set to 0 to draw direct to an X Window, 1 to draw via a pixmap */
+#define TO_PIXMAP 1
+
+#include <stdio.h>
+#include <plplot.h>
+#include <gtk/gtk.h>
+
+/* Needed for GDK_WINDOW_XID */
+#include <gdk/gdkx.h>
+
+/* Main menu structure */
+static GtkItemFactoryEntry menu_items[] = {
+ { "/_File", NULL, NULL, 0, "<Branch>" },
+ { "/File/_Quit", "<control>Q", gtk_main_quit, 0, NULL },
+};
+
+#define APP_INITIAL_WIDTH 320
+#define APP_INITIAL_HEIGHT 200
+
+typedef struct App {
+ GtkWidget *rootwindow;
+ GtkWidget *plotwindow;
+ GdkPixmap *plotwindow_pixmap;
+} App;
+
+App app;
+
+/* ======================================================================== */
+
+void setup_plot_drawable(App *app) {
+
+struct {
+ Display *display;
+ Drawable drawable;
+} xinfo;
+
+PLFLT x[3] = {1,3,4};
+PLFLT y[3] = {3,2,5};
+
+ plsdev("xcairo");
+ plsetopt("drvopt", "external_drawable");
+ plinit();
+
+ #if TO_PIXMAP==1
+ /* Here we set up to draw to a pixmap */
+ xinfo.display = GDK_PIXMAP_XDISPLAY(app->plotwindow_pixmap);
+ xinfo.drawable = GDK_PIXMAP_XID(app->plotwindow_pixmap);
+ #else
+ /* Alternatively, we can do direct to a visible X Window */
+ xinfo.display = GDK_WINDOW_XDISPLAY(app->plotwindow->window);
+ xinfo.drawable = GDK_WINDOW_XID(app->plotwindow->window);
+ #endif
+
+ pl_cmd(PLESC_DEVINIT, &xinfo);
+ plenv(0,5,0,5,0,0);
+
+ plline(3, x, y);
+ plend();
+}
+/* ======================================================================== */
+
+static gint ev_plotwindow_conf(GtkWidget *widget, GdkEventConfigure *ev, gpointer *data) {
+
+ #if TO_PIXMAP==1
+ /* Allocate pixmap */
+ if (app.plotwindow_pixmap)
+ gdk_pixmap_unref(app.plotwindow_pixmap);
+ app.plotwindow_pixmap = gdk_pixmap_new(widget->window,
+ widget->allocation.width,widget->allocation.height,-1);
+
+ /* Clear the pixmap to a sensible background colour */
+ gdk_draw_rectangle(app.plotwindow_pixmap,
+ widget->style->black_gc, TRUE, 0, 0,
+ widget->allocation.width, widget->allocation.height);
+
+ /* If drawing to a pixmap we can do a plot from the conf handler since
+ * the pixmap is now realised (the window widget isn't).
+ */
+ setup_plot_drawable(&app);
+ #endif
+
+ return(TRUE);
+}
+
+static gint ev_plotwindow_expose(GtkWidget *widget, GdkEventExpose *ev, gpointer *data) {
+
+ #if TO_PIXMAP==1
+ /* Dump the cached plot (created in the conf handler) to the window from
+ * the pixmap. We don't need to recreate the plot on each expose.
+ */
+ gdk_draw_pixmap(widget->window,
+ widget->style->fg_gc[GTK_WIDGET_STATE(widget)],
+ app.plotwindow_pixmap, ev->area.x, ev->area.y, ev->area.x, ev->area.y,
+ ev->area.width, ev->area.height);
+ #else
+ /* If drawing direct to an X Window, ensure GTK's double buffering
+ * is turned off for that window or else the plot will be overridden
+ * when the buffer is dumped to the screen.
+ */
+ setup_plot_drawable(&app);
+ #endif
+
+ return(TRUE);
+}
+
+/* ======================================================================== */
+
+void init_app(App *app) {
+
+GtkWidget *menubar;
+GtkItemFactory *item_factory;
+GtkAccelGroup *accel_group = gtk_accel_group_new();
+signed int nitems = sizeof(menu_items) / sizeof(menu_items[0]);
+
+GtkWidget *vbox, *hbox;
+
+ /* Create the top-level root window */
+ app->rootwindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+ gtk_signal_connect(GTK_OBJECT(app->rootwindow), "delete_event", gtk_main_quit,
+ NULL);
+
+ /* A toplevel box to hold things */
+ vbox = gtk_vbox_new(FALSE,0);
+ gtk_container_add(GTK_CONTAINER(app->rootwindow), vbox);
+
+ /* Construct the main menu structure */
+ item_factory = gtk_item_factory_new(GTK_TYPE_MENU_BAR,"<main>",accel_group);
+ gtk_item_factory_create_items(item_factory, nitems, menu_items, NULL);
+ gtk_window_add_accel_group(GTK_WINDOW(app->rootwindow), accel_group);
+ menubar = gtk_item_factory_get_widget(item_factory,"<main>");
+ gtk_box_pack_start(GTK_BOX(vbox), menubar, FALSE, FALSE, 0);
+ gtk_widget_show(menubar);
+
+ /* Fiddle with boxes to effect an indent from the edges of the root window */
+ hbox = gtk_hbox_new(FALSE,0);
+ gtk_box_pack_start(GTK_BOX(vbox), hbox, TRUE, TRUE, 10);
+ vbox = gtk_vbox_new(FALSE,10);
+ gtk_box_pack_start(GTK_BOX(hbox), vbox, TRUE, TRUE, 10);
+
+ /* Add an area to plot into */
+ app->plotwindow = gtk_drawing_area_new();
+ app->plotwindow_pixmap = NULL;
+
+ #if TO_PIXMAP!=1
+ /* Turn off double buffering if we are plotting direct to the plotwindow
+ * in setup_plot_drawable().
+ */
+ GTK_WIDGET_UNSET_FLAGS(app->plotwindow, GTK_DOUBLE_BUFFERED);
+ #endif
+
+ /* By experiment, 3x3 seems to be the smallest size plplot can cope with.
+ * Here we utilise the side effect that gtk_widget_set_size_request()
+ * effectively sets the minimum size of the widget.
+ */
+ gtk_widget_set_size_request(app->plotwindow,3,3);
+ gtk_box_pack_start(GTK_BOX(vbox), app->plotwindow, TRUE, TRUE, 0);
+
+ // Set the initial size of the application
+ gtk_window_set_default_size(GTK_WINDOW(app->rootwindow), APP_INITIAL_WIDTH,APP_INITIAL_HEIGHT);
+
+ g_signal_connect(G_OBJECT(app->plotwindow), "configure_event",
+ G_CALLBACK(ev_plotwindow_conf), NULL);
+ g_signal_connect(G_OBJECT(app->plotwindow), "expose_event",
+ G_CALLBACK(ev_plotwindow_expose), NULL);
+
+ gtk_widget_show_all(app->rootwindow);
+}
+/* ======================================================================== */
+
+int main(int argc, char *argv[]) {
+ gtk_init(&argc, &argv);
+ init_app(&app);
+ gtk_main();
+ return 0;
+}
+/* ======================================================================== */
Property changes on: trunk/examples/c/extXdrawable_demo.c
___________________________________________________________________
Added: keywords
+ Author Date Id Revision
Added: svn:mergeinfo
+
Added: eol-style
+ native
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