/* Copyright (C) 2008 The cairomm Development Team * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ /* M_PI is defined in math.h in the case of Microsoft Visual C++, and * Solaris needs math.h for M_PI and floor() */ #if defined(_MSC_VER) #define _USE_MATH_DEFINES #endif #include #include #include #include #include // This example is based on the C cairo example of the same name const int WIDTH = 150; const int HEIGHT = 150; const int NUM_TEXT = 20; const int TEXT_SIZE = 12; /* Draw the word cairo at NUM_TEXT different angles */ void draw(Cairo::RefPtr cr, int width, int height) { int i, x_off, y_off; Cairo::TextExtents extents; std::string text("cairo"); cr->select_font_face("Bitstream Vera Sans", Cairo::FONT_SLANT_NORMAL, Cairo::FONT_WEIGHT_NORMAL); cr->set_font_size(TEXT_SIZE); Cairo::FontOptions font_options; font_options.set_hint_style(Cairo::HINT_STYLE_NONE); font_options.set_hint_metrics(Cairo::HINT_METRICS_OFF); font_options.set_antialias(Cairo::ANTIALIAS_GRAY); cr->set_font_options(font_options); cr->set_source_rgb(0.0, 0.0, 0.0); cr->translate(width / 2.0, height / 2.0); cr->get_text_extents(text, extents); if (NUM_TEXT == 1) { x_off = y_off = 0; } else { y_off = (int) - floor(0.5 + extents.height / 2.0); x_off = (int) floor(0.5 + (extents.height + 1.0) / (2.0 * tan (M_PI / NUM_TEXT))); } for (i=0; i < NUM_TEXT; i++) { cr->save(); cr->rotate(2 * M_PI * i / NUM_TEXT); cr->set_line_width(1.0); cr->rectangle(x_off - 0.5, y_off - 0.5, extents.width + 1, extents.height + 1); cr->set_source_rgb(1, 0, 0); cr->stroke(); cr->move_to(x_off - extents.x_bearing, y_off - extents.y_bearing); cr->set_source_rgb(0, 0, 0); cr->show_text("cairo"); cr->restore(); } } int main (void) { Cairo::RefPtr surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, WIDTH, HEIGHT); Cairo::RefPtr cr = Cairo::Context::create(surface); draw(cr, WIDTH, HEIGHT); #ifdef CAIRO_HAS_PNG_FUNCTIONS const char* filename = "text-rotate.png"; surface->write_to_png(filename); std::cout << "Wrote file " << filename << std::endl; #else std::cout << "You must compile cairo with PNG support for this example to work" << std::endl; #endif }