Mercurial > MadButterfly
annotate src/shape_text.c @ 84:42698de1f653
Support translate() function for transform attribute of 'g' tag.
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Fri, 22 Aug 2008 12:52:48 +0800 |
| parents | 9ab15ebc9061 |
| children | dd813dcc232c |
| rev | line source |
|---|---|
| 27 | 1 #include <stdio.h> |
| 2 #include <stdlib.h> | |
| 3 #include <string.h> | |
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4 #include <math.h> |
| 27 | 5 #include <cairo.h> |
| 6 #include "mb_types.h" | |
| 7 #include "shapes.h" | |
| 8 | |
| 9 #define OK 0 | |
| 10 #define ERR -1 | |
| 11 | |
| 12 typedef struct _sh_text { | |
| 13 shape_t shape; | |
| 14 char *data; | |
| 15 co_aix x, y; | |
| 16 co_aix d_x, d_y; /* device x and y */ | |
| 17 co_aix font_size; | |
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18 co_aix d_font_size; |
| 27 | 19 cairo_font_face_t *face; |
| 20 cairo_scaled_font_t *scaled_font; | |
| 21 int flags; | |
| 22 } sh_text_t; | |
| 23 | |
| 24 #define TXF_SCALE_DIRTY 0x1 | |
| 25 | |
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26 static void sh_text_free(shape_t *shape) { |
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27 sh_text_t *text = (sh_text_t *)shape; |
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28 |
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29 if(text->scaled_font) |
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30 cairo_scaled_font_destroy(text->scaled_font); |
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31 cairo_font_face_destroy(text->face); |
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32 } |
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33 |
| 27 | 34 shape_t *sh_text_new(const char *txt, co_aix x, co_aix y, |
| 35 co_aix font_size, cairo_font_face_t *face) { | |
| 36 sh_text_t *text; | |
| 37 | |
| 38 text = (sh_text_t *)malloc(sizeof(sh_text_t)); | |
| 39 if(text == NULL) | |
| 40 return NULL; | |
| 41 | |
| 42 memset(text, 0, sizeof(sh_text_t)); | |
| 43 text->shape.sh_type = SHT_TEXT; | |
| 44 text->data = strdup(txt); | |
| 45 if(text->data == NULL) { | |
| 46 free(text); | |
| 47 return NULL; | |
| 48 } | |
| 49 text->x = x; | |
| 50 text->y = y; | |
| 51 text->font_size = font_size; | |
| 52 cairo_font_face_reference(face); | |
| 53 text->face = face; | |
| 54 text->flags |= TXF_SCALE_DIRTY; | |
| 55 | |
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56 text->shape.free = sh_text_free; |
| 27 | 57 |
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58 return (shape_t *)text; |
| 27 | 59 } |
| 60 | |
| 61 static int get_extents(sh_text_t *text, cairo_text_extents_t *extents) { | |
| 62 cairo_matrix_t fmatrix; | |
| 63 cairo_matrix_t ctm; | |
| 64 cairo_scaled_font_t *new_scaled; | |
| 65 cairo_font_options_t *fopt; | |
| 66 | |
| 67 if((text->flags & TXF_SCALE_DIRTY) || | |
| 68 text->scaled_font == NULL) { | |
| 69 fopt = cairo_font_options_create(); | |
| 70 if(fopt == NULL) | |
| 71 return ERR; | |
| 72 memset(&fmatrix, 0, sizeof(cairo_matrix_t)); | |
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73 fmatrix.xx = text->d_font_size; |
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74 fmatrix.yy = text->d_font_size; |
| 27 | 75 memset(&ctm, 0, sizeof(cairo_matrix_t)); |
| 76 ctm.xx = 1; | |
| 77 ctm.yy = 1; | |
| 78 new_scaled = cairo_scaled_font_create(text->face, | |
| 79 &fmatrix, | |
| 80 &ctm, | |
| 81 fopt); | |
| 82 cairo_font_options_destroy(fopt); | |
| 83 if(new_scaled == NULL) | |
| 84 return ERR; | |
| 85 | |
| 86 if(text->scaled_font) | |
| 87 cairo_scaled_font_destroy(text->scaled_font); | |
| 88 text->scaled_font = new_scaled; | |
| 89 text->flags &= ~TXF_SCALE_DIRTY; | |
| 90 } | |
| 91 | |
| 92 cairo_scaled_font_text_extents(text->scaled_font, | |
| 93 text->data, extents); | |
| 94 return OK; | |
| 95 } | |
| 96 | |
| 97 void sh_text_transform(shape_t *shape) { | |
| 98 sh_text_t *text; | |
| 99 co_aix x, y; | |
| 100 co_aix shw; | |
| 101 cairo_text_extents_t extents; | |
| 102 co_aix poses[2][2]; | |
| 103 int r; | |
| 104 | |
| 105 text = (sh_text_t *)shape; | |
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106 |
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107 text->d_font_size = coord_trans_size(shape->coord, text->font_size); |
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parents:
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108 |
| 27 | 109 x = text->x; |
| 110 y = text->y; | |
| 111 coord_trans_pos(shape->coord, &x, &y); | |
| 112 r = get_extents(text, &extents); | |
| 113 if(r != OK) | |
| 58 | 114 /*! \todo announce error. change return type? */ |
| 27 | 115 return; |
| 116 | |
| 117 text->d_x = x; | |
| 118 text->d_y = y; | |
| 119 shw = shape->stroke_width / 2; | |
| 120 /* FIXME: It is unreasonable that a font exceed it's bbox. | |
| 121 * We add 5 pixels in get right bbox. But, it is unreasonable. | |
| 122 */ | |
| 123 poses[0][0] = x + extents.x_bearing - 5 - shw; | |
| 124 poses[0][1] = y + extents.y_bearing - 5 - shw; | |
| 125 poses[1][0] = poses[0][0] + extents.width + 10 + shape->stroke_width; | |
| 126 poses[1][1] = poses[0][1] + extents.height + 10 + shape->stroke_width; | |
| 127 geo_from_positions(shape->geo, 2, poses); | |
| 128 } | |
| 129 | |
| 130 | |
| 131 static void draw_text(sh_text_t *text, cairo_t *cr) { | |
| 132 cairo_set_scaled_font(cr, text->scaled_font); | |
| 133 cairo_move_to(cr, text->d_x, text->d_y); | |
| 134 cairo_text_path(cr, text->data); | |
| 135 } | |
| 136 | |
| 137 | |
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Accept mouse/pointer event and hint the shape that the pointer is over.
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parents:
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138 void sh_text_draw(shape_t *shape, cairo_t *cr) { |
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Accept mouse/pointer event and hint the shape that the pointer is over.
Thinker K.F. Li <thinker@branda.to>
parents:
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139 draw_text((sh_text_t *)shape, cr); |
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Accept mouse/pointer event and hint the shape that the pointer is over.
Thinker K.F. Li <thinker@branda.to>
parents:
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140 } |
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141 |