Skip to content

Instantly share code, notes, and snippets.

@tschoonj

tschoonj/gtkextra-print-export.c

Last active December 20, 2015 00:19
Show Gist options
  • Save tschoonj/6040427 to your computer and use it in GitHub Desktop.
Save tschoonj/6040427 to your computer and use it in GitHub Desktop.
Download ZIP
gtkextra3 example that demonstrates how the plot canvas can be exported or printed
Raw
gtkextra-print-export.c
/*
* compile with gcc -o gtkextra-print-export `pkg-config --cflags gtkextra-3.0` gtkextra-print-export.c `pkg-config --libs gtkextra-3.0`
*/
#include <gtkextra/gtkextra.h>
#include <cairo-ps.h>
#include <cairo-pdf.h>
#include <math.h>
#include <string.h>
struct dialogData {
GtkWidget *window;
GtkWidget *canvas;
};
void destroy_window_cb(GtkWidget *widget, gpointer data) {
gtk_main_quit();
}
gboolean delete_event_cb(GtkWidget *widget, GdkEvent *event, gpointer data) {
return FALSE;
}
void draw_page(GtkPrintOperation *operation, GtkPrintContext *context, gint page_nr, struct dialogData *dd) {
cairo_t *cr;
//the following two lines do all the magic
cr = gtk_print_context_get_cairo_context(context);
gtk_plot_canvas_export_cairo(GTK_PLOT_CANVAS(dd->canvas),cr);
return;
}
void print_button_clicked_cb(GtkWidget *button, struct dialogData *dd) {
GtkPrintOperation *operation;
GError *error = NULL;
GtkPrintOperationResult res;
GtkPrintSettings *print_settings;
GtkPageSetup *page_setup;
//print settings
print_settings = gtk_print_settings_new();
gtk_print_settings_set_orientation(print_settings,GTK_PAGE_ORIENTATION_LANDSCAPE);
gtk_print_settings_set_paper_size(print_settings,gtk_paper_size_new(GTK_PAPER_NAME_A4));
page_setup = gtk_page_setup_new();
gtk_page_setup_set_orientation(page_setup,GTK_PAGE_ORIENTATION_LANDSCAPE);
gtk_page_setup_set_paper_size_and_default_margins(page_setup,gtk_paper_size_new(GTK_PAPER_NAME_A4));
operation = gtk_print_operation_new();
gtk_print_operation_set_print_settings(operation,print_settings);
gtk_print_operation_set_default_page_setup(operation,page_setup);
gtk_print_operation_set_show_progress(operation,TRUE);
gtk_print_operation_set_track_print_status(operation, TRUE);
g_signal_connect(G_OBJECT(operation), "draw-page", G_CALLBACK(draw_page), dd);
gtk_print_operation_set_n_pages(operation, 1);
res = gtk_print_operation_run(operation, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG, GTK_WINDOW(dd->window),&error);
if (res == GTK_PRINT_OPERATION_RESULT_APPLY) {
g_object_unref(print_settings);
print_settings = g_object_ref(gtk_print_operation_get_print_settings(operation));
}
g_object_unref(operation);
return;
}
void export_button_clicked_cb(GtkWidget *button, struct dialogData *dd) {
GtkWidget *dialog;
GtkFileFilter *filter;
gchar *filename;
cairo_t *cr;
cairo_surface_t *surface;
dialog = gtk_file_chooser_dialog_new("Export spectra",
GTK_WINDOW(dd->window), GTK_FILE_CHOOSER_ACTION_SAVE,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT, NULL);
gtk_file_chooser_set_do_overwrite_confirmation (GTK_FILE_CHOOSER (dialog), TRUE);
filter = gtk_file_filter_new();
gtk_file_filter_add_pattern(filter,"*.eps");
gtk_file_filter_set_name(filter,"EPS (Encapsulated PostScript)");
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
filter = gtk_file_filter_new();
gtk_file_filter_add_pattern(filter,"*.pdf");
gtk_file_filter_set_name(filter,"PDF (Adobe Portable Document Format)");
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
filter = gtk_file_filter_new();
gtk_file_filter_add_pattern(filter,"*.png");
gtk_file_filter_set_name(filter,"PNG (Portable Network Graphics)");
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
//get selected filter
filter = gtk_file_chooser_get_filter(GTK_FILE_CHOOSER(dialog));
if (strncmp(gtk_file_filter_get_name(filter),"EPS", 3) == 0) {
if (strcmp(filename+strlen(filename)-4, ".eps") != 0) {
filename = (gchar *) g_realloc(filename,sizeof(gchar)*(strlen(filename)+4));
strcat(filename,".eps");
}
surface = cairo_ps_surface_create(filename,842,595);
cairo_ps_surface_set_eps(surface,1);
cr = cairo_create(surface);
gtk_plot_canvas_export_cairo(GTK_PLOT_CANVAS(dd->canvas),cr);
cairo_show_page(cr);
cairo_surface_destroy(surface);
cairo_destroy(cr);
}
else if (strncmp(gtk_file_filter_get_name(filter),"PDF", 3) == 0) {
if (strcmp(filename+strlen(filename)-4, ".pdf") != 0) {
filename = (gchar *) g_realloc(filename,sizeof(gchar)*(strlen(filename)+4));
strcat(filename,".pdf");
}
surface = cairo_pdf_surface_create(filename,842.0,595.0);
cr = cairo_create(surface);
gtk_plot_canvas_export_cairo(GTK_PLOT_CANVAS(dd->canvas),cr);
cairo_show_page(cr);
cairo_surface_destroy(surface);
cairo_destroy(cr);
}
else if (strncmp(gtk_file_filter_get_name(filter),"PNG", 3) == 0) {
if (strcmp(filename+strlen(filename)-4, ".png") != 0) {
filename = (gchar *) g_realloc(filename,sizeof(gchar)*(strlen(filename)+4));
strcat(filename,".png");
}
surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 842, 595);
cr = cairo_create(surface);
gtk_plot_canvas_export_cairo(GTK_PLOT_CANVAS(dd->canvas),cr);
cairo_surface_write_to_png(surface,filename);
cairo_surface_destroy(surface);
cairo_destroy(cr);
}
g_free(filename);
gtk_widget_destroy(dialog);
}
else
gtk_widget_destroy(dialog);
return;
}
int main(int argc, char *argv[]) {
GdkColor white, red;
gtk_init(&argc, &argv);
//create window
GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
g_signal_connect(window, "destroy", G_CALLBACK(destroy_window_cb), NULL);
g_signal_connect(window, "delete-event", G_CALLBACK(delete_event_cb), NULL);
gtk_window_set_title(GTK_WINDOW(window), "GtkExtra example");
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
//create box that will contain the buttons and the canvas
GtkWidget *mainbox = gtk_vbox_new(FALSE, 2);
gtk_container_set_border_width(GTK_CONTAINER(mainbox),5);
gtk_container_add(GTK_CONTAINER(window), mainbox);
GtkWidget *buttonbox = gtk_hbox_new(TRUE, 2);
GtkWidget *printButton, *exportButton, *quitButton;
printButton = gtk_button_new_from_stock(GTK_STOCK_PRINT);
exportButton = gtk_button_new_from_stock(GTK_STOCK_SAVE_AS);
quitButton = gtk_button_new_from_stock(GTK_STOCK_QUIT);
gtk_box_pack_start(GTK_BOX(buttonbox), printButton, FALSE, FALSE, 1);
gtk_box_pack_start(GTK_BOX(buttonbox), exportButton, FALSE, FALSE, 1);
gtk_box_pack_start(GTK_BOX(buttonbox), quitButton, FALSE, FALSE, 1);
struct dialogData *dd = g_malloc(sizeof(struct dialogData));
dd->window = window;
g_signal_connect(G_OBJECT(exportButton),"clicked",G_CALLBACK(export_button_clicked_cb), dd);
g_signal_connect(G_OBJECT(printButton),"clicked",G_CALLBACK(print_button_clicked_cb), dd);
g_signal_connect_swapped(G_OBJECT(quitButton), "clicked", G_CALLBACK(gtk_widget_destroy), window);
gtk_box_pack_start(GTK_BOX(mainbox), buttonbox, FALSE, FALSE, 1);
GtkWidget *canvas = gtk_plot_canvas_new(GTK_PLOT_A4_H, GTK_PLOT_A4_W, 0.8);
gtk_box_pack_start(GTK_BOX(mainbox), canvas, FALSE, FALSE, 2);
GTK_PLOT_CANVAS_UNSET_FLAGS(GTK_PLOT_CANVAS(canvas), GTK_PLOT_CANVAS_CAN_SELECT | GTK_PLOT_CANVAS_CAN_SELECT_ITEM);
gdk_color_parse("white", &white);
gdk_colormap_alloc_color(gdk_colormap_get_system(), &white, FALSE, TRUE);
gdk_color_parse("red", &red);
gdk_colormap_alloc_color(gdk_colormap_get_system(), &red, FALSE, TRUE);
gtk_plot_canvas_set_background(GTK_PLOT_CANVAS(canvas),&white);
dd->canvas = canvas;
//lets add a graph to canvas
//calculate a sine function
double *xvals = g_malloc(sizeof(double)*1000);
double *yvals = g_malloc(sizeof(double)*1000);
int i;
for (i = 0 ; i < 1000 ; i++) {
xvals[i] = 4*M_PI*i/999;
yvals[i] = sin(xvals[i]);
}
GtkWidget *plot_window;
plot_window = gtk_plot_new_with_size(NULL,.65,.45);
gtk_plot_set_background(GTK_PLOT(plot_window),&white);
gtk_plot_hide_legends(GTK_PLOT(plot_window));
gtk_plot_set_ticks(GTK_PLOT(plot_window), GTK_PLOT_AXIS_X, M_PI_2, 5);
gtk_plot_set_ticks(GTK_PLOT(plot_window), GTK_PLOT_AXIS_Y, 0.2, 5);
gtk_plot_grids_set_visible(GTK_PLOT(plot_window),TRUE ,FALSE, TRUE,FALSE);
gtk_plot_axis_hide_title(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_TOP));
gtk_plot_axis_hide_title(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_RIGHT));
gtk_plot_axis_set_title(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_BOTTOM),"x");
gtk_plot_axis_set_title(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_LEFT),"y=sin(x)");
gtk_plot_axis_title_set_attributes(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_LEFT),"Helvetica",40,90,NULL,NULL,TRUE,GTK_JUSTIFY_CENTER);
gtk_plot_axis_title_set_attributes(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_BOTTOM),"Helvetica",40,0,NULL,NULL,TRUE,GTK_JUSTIFY_CENTER);
gtk_plot_axis_set_labels_attributes(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_LEFT),"Helvetica",20,0,NULL,NULL,TRUE,GTK_JUSTIFY_RIGHT);
gtk_plot_axis_set_labels_attributes(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_RIGHT),"Helvetica",20,0,NULL,NULL,TRUE,GTK_JUSTIFY_LEFT);
gtk_plot_axis_set_labels_attributes(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_BOTTOM),"Helvetica",20,0,NULL,NULL,TRUE,GTK_JUSTIFY_CENTER);
gtk_plot_axis_show_labels(gtk_plot_get_axis(GTK_PLOT(plot_window), GTK_PLOT_AXIS_TOP),0);
GtkPlotCanvasChild *child = gtk_plot_canvas_plot_new(GTK_PLOT(plot_window));
gtk_plot_canvas_put_child(GTK_PLOT_CANVAS(canvas), child, .15,.05,.90,.85);
GtkPlotData *dataset;
dataset = GTK_PLOT_DATA(gtk_plot_data_new());
gtk_plot_add_data(GTK_PLOT(plot_window),dataset);
gtk_plot_data_set_numpoints(dataset, 1000);
gtk_plot_data_set_x(dataset, xvals);
gtk_plot_data_set_y(dataset, yvals);
gtk_plot_set_range(GTK_PLOT(plot_window),0.0, 4*M_PI, -1.0, 1.0);
gtk_plot_clip_data(GTK_PLOT(plot_window), TRUE);
gtk_widget_show(GTK_WIDGET(dataset));
gtk_plot_data_set_line_attributes(dataset,GTK_PLOT_LINE_SOLID,0,0,1,&red);
gtk_plot_canvas_paint(GTK_PLOT_CANVAS(canvas));
gtk_widget_queue_draw(GTK_WIDGET(canvas));
gtk_plot_canvas_refresh(GTK_PLOT_CANVAS(canvas));
gtk_plot_paint(GTK_PLOT(plot_window));
gtk_plot_refresh(GTK_PLOT(plot_window),NULL);
gtk_widget_show_all(window);
gtk_main();
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment