TextExtents


Object Hierarchy:

Object hierarchy for TextExtents

Description:

[ CCode ( cname = "cairo_text_extents_t" , has_type_id = false ) ]
public struct TextExtents

Example: Centered text:

public static int main (string[] args) {
// Create a context:
Cairo.ImageSurface surface = new Cairo.ImageSurface (Cairo.Format.ARGB32, 256, 256);
Cairo.Context context = new Cairo.Context (surface);

// Text:
string utf8 = "cairo";

context.select_font_face ("Sans", Cairo.FontSlant.NORMAL, Cairo.FontWeight.NORMAL);
context.set_font_size (52.0);

Cairo.TextExtents extents;
context.text_extents (utf8, out extents);
double x = 128.0-(extents.width/2 + extents.x_bearing);
double y = 128.0-(extents.height/2 + extents.y_bearing);

context.move_to (x, y);
context.show_text (utf8);

// Draw helping lines:
context.set_source_rgba (1, 0.2, 0.2, 0.6);
context.set_line_width (6.0);
context.arc (x, y, 10.0, 0, 2*Math.PI);
context.fill ();
context.move_to (128.0, 0);
context.rel_line_to (0, 256);
context.move_to (0, 128.0);
context.rel_line_to (256, 0);
context.stroke ();

// Save the image:
surface.write_to_png ("img.png");


return 0;
}

valac --pkg cairo text-centered.vala

Example: TextExtents:

public static int main (string[] args) {
// Create a context:
Cairo.ImageSurface surface = new Cairo.ImageSurface (Cairo.Format.ARGB32, 290, 256);
Cairo.Context context = new Cairo.Context (surface);

// Text:
string utf8 = "cairo";
double x = 25.0;
double y = 150.0;

context.select_font_face ("Sans", Cairo.FontSlant.NORMAL, Cairo.FontWeight.NORMAL);

Cairo.TextExtents extents;
context.set_font_size (100.0);
context.text_extents (utf8, out extents);

context.move_to (x,y);
context.show_text (utf8);

// Draw helping lines:
context.set_source_rgba (1, 0.2, 0.2, 0.6);
context.set_line_width (6.0);
context.arc (x, y, 10.0, 0, 2*Math.PI);
context.fill ();
context.move_to (x,y);
context.rel_line_to (0, -extents.height);
context.rel_line_to (extents.width, 0);
context.rel_line_to (extents.x_bearing, -extents.y_bearing);
context.stroke ();

// Save the image:
surface.write_to_png ("img.png");

return 0;
}

valac --pkg cairo text-extends.vala


Namespace: Cairo
Package: cairo

Content:

Fields: