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Make EAN and UPC symbols resizable in glabels in accordance with EN 797:1996

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As requested by Sebastien Marie <semarie@online.fr>
This commit is contained in:
Robin Stuart 2018-01-29 19:12:30 +00:00
parent 0d4af7a462
commit 3aeb1ea70a
1 changed files with 13 additions and 6 deletions
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19
backend/render.c
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@ -267,27 +267,34 @@ int render_plot(struct zint_symbol *symbol, float width, float height) {
/* The X-dimension of UPC/EAN symbols is fixed at 0.330mm */
/* The phrase before is questionable. It may scale in certain percentages (80% - 200%).
see https://internationalbarcodes.com/ean-13-specifications/ */
// Can now cope with sizes between 80% and 200%, enforces correct aspect ratio
/* NOTE: This code will need adjustment before it correctly deals with composite symbols */
x_dimension = 0.330;
width = 0.330 * GL_CONST * total_area_width_x;
/* The height is also fixed */
//x_dimension = 0.330;
if (x_dimension < 0.26) {
x_dimension = 0.26;
}
if (x_dimension > 0.66) {
x_dimension = 0.66;
}
width = x_dimension * GL_CONST * total_area_width_x;
switch (upceanflag) {
case 6:
case 12:
case 13:
/* UPC-A, UPC-E and EAN-13 */
/* Height of bars should be 22.85mm */
height = ((0.330 * ((2 * symbol->border_width) + text_offset + text_height)) + 22.85) * GL_CONST;
height = ((x_dimension * ((2 * symbol->border_width) + text_offset + text_height)) + (22.85 * (x_dimension / 0.33))) * GL_CONST;
break;
case 8:
/* EAN-8 */
/* Height of bars should be 18.23mm */
height = ((0.330 * ((2 * symbol->border_width) + text_offset + text_height)) + 18.23) * GL_CONST;
height = ((x_dimension * ((2 * symbol->border_width) + text_offset + text_height)) + (18.23 * (x_dimension / 0.33))) * GL_CONST;
break;
default:
/* EAN-2 and EAN-5 */
/* Height of bars should be 21.10mm */
height = ((0.330 * ((2 * symbol->border_width) + text_offset + text_height)) + 21.10) * GL_CONST;
height = ((x_dimension * ((2 * symbol->border_width) + text_offset + text_height)) + (21.10 * (x_dimension / 0.33))) * GL_CONST;
}
}