<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="EN-GB" link="#0563C1" vlink="#954F72"> <div class="WordSection1"> Hello Eric,<o:p></o:p> <o:p> </o:p> I was about to get started so your reply is most timely and appreciated.<o:p></o:p> <o:p> </o:p> I’m competent in C and can see what you’re doing here. I should be able to port to Python easily.<o:p></o:p> <o:p> </o:p> Thanks again.<o:p></o:p> <o:p> </o:p> /W<o:p></o:p> <o:p> </o:p> From: cecashon@aol.com <cecashon@aol.com> Sent: 30 April 2019 18:48 To: Warren Vick <wvick@europa.uk.com>; cairo@cairographics.org Subject: Re: [cairo] Text stuffing with Cairo/pycairo?<o:p></o:p> <o:p> </o:p> <div> Hi Warren, Have you made some progress with this? Well, you might need some font metrics and get the transforms in order to be able to do this. The following is in C but it might be helpful. Probably need to change a few things around but it is a start. Eric //gcc -Wall cairo_text_size.c -o cairo_text_size `pkg-config --cflags --libs cairo` -lm #include<cairo.h> #include<cairo-pdf.h> #include<stdio.h> #include<math.h> static void text_in_box(cairo_t *cr, double center_box_x, double center_box_y, double box_width, double box_height, double rotate, char *string); int main() { double width=600.0; double height=600.0; char *string1="Center String"; char *string2="Translate Stringssssss!"; char *string3="Rotate String"; char *string4="Joy!!!"; cairo_surface_t *surface=cairo_pdf_surface_create("cairo_test1.pdf", width, height); cairo_t *cr=cairo_create(surface); //Paint background. cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0); cairo_paint(cr); //Draw from the center of surface. Good for testing text and box alignment. cairo_translate(cr, width/2.0, height/2.0); //Scale the drawing if needed. cairo_scale(cr, 1.0, 1.0); //Draw cartesian coordinates. cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0); cairo_move_to(cr, -width/2.0, 0.0); cairo_line_to(cr, width/2.0, 0.0); cairo_stroke(cr); cairo_move_to(cr, 0.0, -height/2.0); cairo_line_to(cr, 0.0, height/2.0); cairo_stroke(cr); cairo_select_font_face(cr, "courier", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD); //Since the font gets scaled to the box the default font size should be fine. //cairo_set_font_size(cr, 10.0); //Draw text at center. text_in_box(cr, 0.0, 0.0, 350.0, 100.0, 0.0, string1); //Translate text. text_in_box(cr, -120.0, -150.0, 300.0, 30.0, 0.0, string2); //Rotate text. text_in_box(cr, 150.0, 150.0, 121.0, 52.0, M_PI/4.0, string3); text_in_box(cr, -150.0, 185.0, 121.0, 52.0, -M_PI/4.0, string4); text_in_box(cr, 150.0, -190.0, 225.0, 52.0, -M_PI/4.0, string4); printf("Output to cairo_test1.pdf\n"); cairo_destroy(cr); cairo_surface_destroy(surface); return 0; } static void text_in_box(cairo_t *cr, double center_box_x, double center_box_y, double box_width, double box_height, double rotate, char *string) { double move_x=0.0; double move_y=0.0; double scale_x=0.0; double scale_y=0.0; cairo_text_extents_t te; cairo_font_extents_t fe; //Get some font metrics. cairo_text_extents(cr, string, &te); cairo_font_extents(cr, &fe); move_x=-te.width/2.0-te.x_bearing; move_y=-te.height/2.0-te.y_bearing; //Pad the rectangle a little. scale_x=-te.width/2.0-te.x_bearing-4.0; scale_y=-te.height/2.0-te.y_bearing+fe.descent; //Order transforms and draw. cairo_save(cr); cairo_translate(cr, center_box_x, center_box_y); cairo_rotate(cr, rotate); cairo_scale(cr, box_width/fabs(2.0*move_x), box_height/fabs(2.0*move_y)); cairo_set_source_rgba(cr, 0.0, 1.0, 0.0, 0.4); cairo_rectangle(cr, -fabs(scale_x), -fabs(scale_y), fabs(2.0*scale_x), fabs(2.0*scale_y)); cairo_fill(cr); cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0); cairo_move_to(cr, move_x, move_y); cairo_show_text(cr, string); cairo_restore(cr); }<o:p></o:p> </div> <div> <o:p> </o:p> </div> <o:p> </o:p> </div> </body> </html>