annotate src/shape_text.c @ 285:248a40d51473

Check in test program for sh_text_set_text for debugging. It is not working yet.
author wycc
date Sat, 31 Jan 2009 16:52:28 +0800
parents c8b6ca46950b
children 13ce87b6dbf5
rev   line source
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <math.h>
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5 #include <cairo.h>
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6 #include <pango/pangocairo.h>
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7 #include "mb_types.h"
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8 #include "mb_shapes.h"
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9
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10 #define ASSERT(x)
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11 #define OK 0
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12 #define ERR -1
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13
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14 typedef struct _sh_text {
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15 shape_t shape;
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16 char *data;
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17 co_aix x, y;
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18 co_aix d_x, d_y; /* device x and y */
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19 co_aix font_size;
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20 co_aix d_font_size;
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21 cairo_font_face_t *face;
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22 cairo_scaled_font_t *scaled_font;
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23 int flags;
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24 PangoLayout *layout;
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25 PangoAttrList *attrs;
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26 } sh_text_t;
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28 #define TXF_SCALE_DIRTY 0x1
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29
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30 static void sh_text_free(shape_t *shape) {
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31 sh_text_t *text = (sh_text_t *)shape;
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32
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33 if(text->scaled_font)
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34 cairo_scaled_font_destroy(text->scaled_font);
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35 cairo_font_face_destroy(text->face);
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36 }
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38 static void sh_text_P_generate_layout(sh_text_t *text,cairo_t *cr);
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39 shape_t *rdman_shape_text_new(redraw_man_t *rdman,
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40 const char *txt, co_aix x, co_aix y,
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41 co_aix font_size, cairo_font_face_t *face,PangoAttrList *attrs) {
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42 sh_text_t *text;
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43
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44 text = (sh_text_t *)malloc(sizeof(sh_text_t));
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45 if(text == NULL)
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46 return NULL;
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47
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48
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49 memset(text, 0, sizeof(sh_text_t));
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50 mb_obj_init(text, MBO_TEXT);
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51 text->data = strdup(txt);
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52 if(text->data == NULL) {
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53 free(text);
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54 return NULL;
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55 }
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56 text->x = x;
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57 text->y = y;
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58 text->font_size = font_size;
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59 cairo_font_face_reference(face);
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60 text->face = face;
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61 text->flags |= TXF_SCALE_DIRTY;
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62
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63 text->shape.free = sh_text_free;
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64 text->layout = NULL;
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65 text->attrs = attrs;
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66 sh_text_P_generate_layout(text, rdman->cr);
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67
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68 rdman_shape_man(rdman, (shape_t *)text);
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70 return (shape_t *)text;
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71 }
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72
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73 extern void sh_text_set_text(shape_t *shape, const char *txt) {
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74 sh_text_t *text = (sh_text_t *)shape;
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75 char *buf;
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76
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77 buf = strdup(txt);
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78 if(text->data) free(text->data);
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79 text->data = buf;
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80 }
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81
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82 static int get_extents(sh_text_t *text, PangoRectangle *extents) {
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83 cairo_matrix_t fmatrix;
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84 cairo_matrix_t ctm;
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85 cairo_scaled_font_t *new_scaled;
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86 cairo_font_options_t *fopt;
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87
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88 pango_layout_get_extents(text->layout, NULL, extents);
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89 pango_extents_to_pixels(extents,NULL);
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90 return OK;
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91 }
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92
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93 void sh_text_transform(shape_t *shape) {
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94 sh_text_t *text;
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95 co_aix x, y;
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96 co_aix shw;
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97 PangoRectangle extents;
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98 co_aix poses[2][2];
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99 int r;
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100
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101 text = (sh_text_t *)shape;
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102
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103 text->d_font_size = coord_trans_size(shape->coord, text->font_size);
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104
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105 x = text->x;
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106 y = text->y;
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107 coord_trans_pos(shape->coord, &x, &y);
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108 r = get_extents(text, &extents);
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110 //printf("x=%f y=%f text=%s ascent=%d,descent=%d,width=%d height=%d\n", x,y,text->data,PANGO_ASCENT(extents), PANGO_DESCENT(extents), extents.width, extents.height);
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111 ASSERT(r == OK);
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112
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113 text->d_x = x-5;
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114 text->d_y = y-PANGO_DESCENT(extents)+5;
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115 shw = shape->stroke_width / 2;
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116 /* FIXME: It is unreasonable that a font exceed it's bbox.
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117 * We add 5 pixels in get right bbox. But, it is unreasonable.
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118 */
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119
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120 poses[0][0] = x + extents.x - shw;
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121 poses[0][1] = y + extents.y - shw;
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122 poses[1][0] = poses[0][0] + extents.width + shape->stroke_width;
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123 poses[1][1] = poses[0][1] + extents.height + shape->stroke_width;
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124 geo_from_positions(shape->geo, 2, poses);
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125 /*! \todo Support ratation for shape_text. */
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126 }
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127
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128 static void sh_text_P_generate_layout(sh_text_t *text,cairo_t *cr)
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129 {
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130 PangoAttribute *attr;
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131 PangoAttrList *attrlist;
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132 PangoFontDescription *desc;
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133
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134 if (text->layout) {
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135 g_object_unref(text->layout);
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136 }
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137 text->layout = pango_cairo_create_layout(cr);
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138 desc = pango_font_description_from_string("Sans Bold");
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139 cairo_set_source_rgb (cr, 0, 0, 0);
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140 pango_layout_set_font_description (text->layout, desc);
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141 pango_layout_set_text(text->layout,text->data,strlen(text->data));
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142 pango_layout_set_attributes(text->layout, text->attrs);
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143 pango_cairo_update_layout(cr,text->layout);
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144 }
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Thinker K.F. Li <thinker@branda.to>
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145 static void draw_text(sh_text_t *text, cairo_t *cr) {
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86a5ae82ccf2 * Modify svg2code_ex to use differnt font size at two test items to illustrate the function of the new text parser
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146 sh_text_P_generate_layout(text, cr);
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Thinker K.F. Li <thinker@branda.to>
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147 cairo_move_to(cr, text->d_x, text->d_y);
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a90fd749af82 Implement the whole tspan attribute. Currently, we can accept font family/font style/font weight and font size.
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148 pango_cairo_show_layout(cr,text->layout);
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Thinker K.F. Li <thinker@branda.to>
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149 }
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Thinker K.F. Li <thinker@branda.to>
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150
19c603dd6ff9 Add text shape.
Thinker K.F. Li <thinker@branda.to>
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151
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e06a4a667ce2 Accept mouse/pointer event and hint the shape that the pointer is over.
Thinker K.F. Li <thinker@branda.to>
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152 void sh_text_draw(shape_t *shape, cairo_t *cr) {
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Thinker K.F. Li <thinker@branda.to>
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153 draw_text((sh_text_t *)shape, cr);
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Thinker K.F. Li <thinker@branda.to>
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154 }
e06a4a667ce2 Accept mouse/pointer event and hint the shape that the pointer is over.
Thinker K.F. Li <thinker@branda.to>
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155