ibm_cairo_logo.c

#include <gtk/gtk.h>
#include <cairo.h>
#include <cairo-pdf.h>
#include <cairo-ps.h>
#include <cairo-svg.h>
#include <math.h>
#include <gdk/gdkkeysyms.h>
#include <string.h>#define WIDTH  800
#define HEIGHT 600
#define STRIDE WIDTH*4
#define MAX_COORDS 1024/* This path desribes what will be drawn later The bulk of it is doing the IBM letters by connect the dotsat the very end, we will get fancy and add a (R) Registered logo.
*/
static void
travel_path (cairo_t *cr)
{gint     pen_radius         = 10;cairo_set_source_rgb (cr, 1,1,1);cairo_paint (cr);cairo_set_line_width (cr, pen_radius*2);/* Use IBM Blue Pen Color with no ALPHA */cairo_set_source_rgba (cr, .3, .42, .69, 1);/* This Draws the IBM 8 Lines "I" Logo */cairo_move_to (cr, 10, 10);cairo_line_to (cr, 160, 10); cairo_move_to (cr, 10, 40);cairo_line_to (cr, 160, 40);/* NOTE: Narrower Middle: 1/3 width */cairo_move_to (cr, 60, 70);cairo_line_to (cr, 110, 70);cairo_move_to (cr, 60, 100);cairo_line_to (cr, 110, 100);cairo_move_to (cr, 60, 130);cairo_line_to (cr, 110, 130);cairo_move_to (cr, 60, 160);cairo_line_to (cr, 110, 160);/* END Narrower Middle */cairo_move_to (cr, 10, 190);cairo_line_to (cr, 160, 190);cairo_move_to (cr, 10, 220);cairo_line_to (cr, 160, 220);/* END "I" DRAWING *//* This Draws the IBM 8 Lines "B" Logo */cairo_move_to (cr, 170, 10);cairo_line_to (cr, 340, 10); cairo_move_to (cr, 170, 40);cairo_line_to (cr, 360, 40); cairo_move_to (cr, 200, 70);cairo_line_to (cr, 250, 70);/*B's have holes in them! */cairo_move_to (cr, 300, 70); cairo_line_to (cr, 360, 70); cairo_move_to (cr, 210, 100);cairo_line_to (cr, 350, 100); cairo_move_to (cr, 210, 130);cairo_line_to (cr, 350, 130); cairo_move_to (cr, 200, 160);cairo_line_to (cr, 250, 160);/*B's have holes in them! */cairo_move_to (cr, 300, 160); cairo_line_to (cr, 360, 160); cairo_move_to (cr, 170, 190);cairo_line_to (cr, 360, 190); cairo_move_to (cr, 170, 220);cairo_line_to (cr, 340, 220); /* END "B" DRAWING *//* THE EVER POINTY "M"  */cairo_move_to (cr, 370, 10);cairo_line_to (cr, 470, 10); cairo_move_to (cr, 560, 10);cairo_line_to (cr, 660, 10); cairo_move_to (cr, 370, 40);cairo_line_to (cr, 490, 40); cairo_move_to (cr, 540, 40);cairo_line_to (cr, 660, 40); cairo_move_to (cr, 400, 70);cairo_line_to (cr, 510, 70); cairo_move_to (cr, 520, 70);cairo_line_to (cr, 630, 70); cairo_move_to (cr, 400, 100);cairo_line_to (cr, 630, 100); cairo_move_to (cr, 400, 130);cairo_line_to (cr, 470, 130);cairo_move_to (cr, 480, 130);cairo_line_to (cr, 550, 130);cairo_move_to (cr, 560, 130);cairo_line_to (cr, 630, 130); cairo_move_to (cr, 400, 160);cairo_line_to (cr, 470, 160);cairo_move_to (cr, 490, 160);cairo_line_to (cr, 540, 160);cairo_move_to (cr, 560, 160);cairo_line_to (cr, 630, 160); cairo_move_to (cr, 370, 190);cairo_line_to (cr, 470, 190);cairo_move_to (cr, 500, 190);cairo_line_to (cr, 530, 190);cairo_move_to (cr, 560, 190);cairo_line_to (cr, 660, 190); cairo_move_to (cr, 370, 220);cairo_line_to (cr, 470, 220);cairo_move_to (cr, 510, 220);cairo_line_to (cr, 520, 220);cairo_move_to (cr, 560, 220);cairo_line_to (cr, 660, 220); /* END POINTY LETTERS *//* We stroke the path so we see everything we just specifiedby connecting the dots*/cairo_stroke(cr);/* Let us add a disclaimer and show some fancy cairo: *//* We are going to want a nice fine lined circle around the R you need to make sure you have stroked existing thingsthat you wanted drawn with the larger pen before continuing. */cairo_set_line_width (cr, pen_radius*.5);/* Now we will draw the fancy circle around the "R" *//* NOTE: The angles are in radians */cairo_move_to (cr, 710, 200);double angle1 = 0 * (M_PI/180.0);  double angle2 = 360 * (M_PI/180.0);/* We draw a large black circle */cairo_set_source_rgba (cr, 0, 0, 0, 1);cairo_arc (cr, 710, 200, 20, angle1, angle2);cairo_stroke (cr);/* We draw a smaller white circle centered on it */cairo_set_source_rgba (cr, 1, 1, 1, 1);cairo_arc (cr, 710, 200, 20, angle1, angle2);/* We use the fill operator to fill in the circle! */cairo_fill (cr);/* We are going to draw the letter "R" with black pen*/cairo_move_to (cr, 695,212); /* Bottom left of text at point */cairo_set_source_rgba (cr, 0, 0, 0, 1);cairo_select_font_face (cr, "Sans", CAIRO_FONT_SLANT_NORMAL,CAIRO_FONT_WEIGHT_BOLD);cairo_set_font_size (cr, 40);cairo_show_text (cr, "R");/* We stroke everything we have just done to actually draw it...*/ cairo_stroke (cr);     }/* Apply our path to the surface specified */
static void
draw (cairo_surface_t *surface)
{cairo_t *cr;cr = cairo_create (surface);/* Try applying the scale and rotate factors here to examine their effects on the output!*//* cairo_rotate (cr, -M_PI / 4); *//* cairo_scale (cr, 2, 1.0);  */travel_path (cr);cairo_destroy (cr);
}/* Function needed to draw to gtk window */
static void
draw_gtk (GtkWidget      *widget,GdkEventExpose *eev,gpointer        data)
{cairo_t *cr;cr = gdk_cairo_create (widget->window);travel_path (cr);cairo_destroy (cr);
}/* We will draw our path on multiple surfaces to demonstrate some of the various cairo backend
*/
int
main (gint    argc,gchar **argv)
{cairo_surface_t *surface;/* PDF Backend */surface = cairo_pdf_surface_create ("IBM.pdf",WIDTH, HEIGHT);draw (surface);cairo_surface_destroy (surface);/* Postscript Backend */surface = cairo_ps_surface_create ("IBM.ps",WIDTH, HEIGHT);draw (surface);cairo_surface_destroy (surface);/* Image backend */surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,WIDTH, HEIGHT);draw (surface);cairo_surface_write_to_png (surface, "IBM.png");cairo_surface_destroy (surface);/* Scalable Vector Graphics Backend */surface = cairo_svg_surface_create ("IBM.svg",WIDTH, HEIGHT);draw (surface);cairo_surface_destroy (surface);/* GTK Window using Cairo */gtk_init (NULL, NULL);        /* Fire up GTK!       */GtkWidget *mainwin;           /* Make a new windows */GtkWidget *canvas = NULL;     /* Make a new canvas  */mainwin = gtk_window_new (GTK_WINDOW_TOPLEVEL);canvas = gtk_drawing_area_new ();gtk_widget_set_size_request (canvas, WIDTH, HEIGHT);     gtk_container_add (GTK_CONTAINER (mainwin), canvas); /* Place the canvas in the window */g_signal_connect (mainwin, "destroy", G_CALLBACK (gtk_main_quit), NULL); /* Quit graphically *//* Instead of drawing like usual, we connect the expose event to do the drawing! */g_signal_connect (G_OBJECT (canvas), "expose-event",G_CALLBACK (draw_gtk), NULL);gtk_widget_show_all (mainwin); /* Show the window on the screen */gtk_main ();return 0;
}

Makefile

all: gcc ibm_cairo_logo.c  `pkg-config --libs --cflags gtk+-2.0`
clean:rm -f a.out

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用Cairo画IBM logo并输出为pdf，ps，svg格式文件

ibm_cairo_logo.c

Makefile

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