testcases/phpCairo/operator-source.php

   1 <?
   2
   3 $width = 16;
   4 $height = 16;
   5 $pad = 2;
   6
   7 function set_solid_pattern ($x, $y)
   8 {
   9     global $con;
  10     $con->set_source_rgb (1.0, 0, 0.0);
  11 }
  12
  13 function set_translucent_pattern ($x, $y)
  14 {
  15     global $con;
  16     $con->set_source_rgba (1,0, 0, 0.5);
  17 }
  18
  19
  20 function set_gradient_pattern ($x, $y)
  21 {
  22     global $con,$width,$height;
  23
  24     $pat = new CairoLinearGradient ($x, $y, $x + $width, $y + $height);
  25     $pat->add_color_stop_rgba (0.2, 1, 0, 0, 1);
  26     $pat->add_color_stop_rgba ( 0.8, 1, 0, 0, 0.0);
  27     $con->set_source ($pat);
  28
  29 }
  30
  31 function set_surface_pattern($x, $y)
  32 {
  33         global $con,$sur,$width,$height;
  34         $wi = floor(0.6*$width);
  35         $he = floor(0.6*$height);
  36         $x+=0.2 * $width;
  37         $y+=0.2 * $height;
  38         $s = $sur->create_similar(CONTENT_COLOR_ALPHA, $wi, $he);
  39         $con2 = new CairoContext($s);
  40         $con2->set_source_rgb(1,0,0);
  41         $con2->paint();
  42         $con2->set_source_rgb(1,1,1);
  43     $con2->arc ( 0.5 * $wi, 0.5 * $he, 0.5 * $he, 0, 2 * M_PI);
  44         $con2->fill();
  45         $s->write_to_png("temp1.png");
  46         $con->set_source_surface($s,$x,$y);
  47         unset($s);
  48         //unset($con2);
  49 }
  50
  51
  52 function draw_mask ($x, $y)
  53 {
  54
  55     global $con,$width,$height,$sur;
  56     $wi = floor(0.9 * $width);
  57     $he = floor(0.9 * $height);
  58     $x += 0.05 * $width;
  59     $y += 0.05 * $height;
  60     $s = new CairoImageSurface(FORMAT_ARGB32, 1, 1);
  61     $s = $sur->create_similar (
  62                                                  CONTENT_ALPHA,
  63                                                  $wi, $he);
  64     $con2 = new CairoContext($s);
  65
  66     $con2->set_source_rgb (1, 1, 1); /* white */
  67
  68     $con2->arc (0.5 * $wi, 0.5 * $he, 0.45 * $he, 0, 2 * M_PI);
  69     $con2->fill ();
  70
  71
  72     $con->mask_surface ($s, $x, $y);
  73         unset($s);
  74
  75 }
  76
  77 function draw_glyphs ($x, $y)
  78 {
  79
  80     global $con,$width,$height;
  81     $con->set_font_size (0.8 * $height);
  82
  83     $extents = $con->text_extents ("FG");
  84     $con->move_to (
  85                    $x + floor (($width - $extents["width"]) / 2 + 0.5) - $extents["x_bearing"],
  86                    $y + floor (($height - $extents["height"]) / 2 + 0.5) - $extents["y_bearing"]);
  87     $con->show_text ("FG");
  88 }
  89
  90 function draw_polygon ($x, $y)
  91 {
  92     global $con,$width,$height;
  93
  94     $wi = floor(0.9 * $width);
  95     $he = floor(0.9 * $height);
  96     $x += 0.05 * $width;
  97     $y += 0.05 * $height;
  98
  99     $con->new_path ();
 100     $con->move_to ($x, $y);
 101     $con->line_to ($x, $y + $he);
 102     $con->line_to ($x + $wi / 2, $y + 3 * $he / 4);
 103     $con->line_to ($x + $wi, $y + $he);
 104     $con->line_to ($x + $wi, $y);
 105     $con->line_to ($x + $wi / 2, $y + $he / 4);
 106     $con->close_path ();
 107     $con->fill ();
 108 }
 109
 110 function draw_rects ($x, $y)
 111 {
 112     global $con,$width,$height;
 113
 114     $block_width = floor(0.33 * $width + 0.5);
 115     $block_height = floor(0.33 * $height + 0.5);
 116
 117
 118     for ($i = 0; $i < 3; $i++)
 119         for ($j = 0; $j < 3; $j++)
 120             if (($i + $j) % 2 == 0)
 121                 $con->rectangle (
 122                                  $x + $block_width * $i, $y + $block_height * $j,
 123                                  $block_width,         $block_height);
 124
 125     $con->fill ();
 126 }
 127
 128 $imwidth = 4*($width+$pad) + $pad;
 129 $imheight = 4*($height+$pad) + $pad;
 130
 131 $sur = new CairoImageSurface(FORMAT_ARGB32, $imwidth, $imheight);
 132 $con = new CairoContext($sur);
 133
 134     $con->select_font_face ( "Bitstream Vera Sans",
 135                             FONT_SLANT_NORMAL,
 136                             FONT_WEIGHT_NORMAL);
 137
 138     for ($j = 0; $j < 4; $j++) {
 139         for ($i = 0; $i < 4; $i++) {
 140             $x = $i * ($width + $pad) + $pad;
 141             $y = $j * ($height + $pad) + $pad;
 142
 143             $con->save ();
 144
 145             $pat = new CairoLinearGradient ($x + $width, $y,
 146                                                    $x,         $y + $height);
 147             $pat->add_color_stop_rgba (0.2,
 148                                                0.0, 0.0, 1.0, 1.0); /* Solid blue */
 149             $pat->add_color_stop_rgba ( 0.8,
 150                                                0.0, 0.0, 1.0, 0.0); /* Transparent blue */
 151             $con->set_source ($pat);
 152
 153
 154             $con->rectangle ($x, $y, $width, $height);
 155             $con->fill_preserve ();
 156             $con->clip ();
 157
 158             $con->set_operator (OPERATOR_SOURCE);
 159             //pattern_funcs[i] ($x, $y);
 160             switch($i) {
 161                 case 0:
 162                         set_solid_pattern($x,$y);
 163                         break;
 164                 case 1:
 165                         set_translucent_pattern($x,$y);
 166                         break;
 167                 case 2:
 168                         set_gradient_pattern($x,$y);
 169                         break;
 170                 case 3:
 171                         set_surface_pattern($x,$y);
 172                         break;
 173                 }
 174
 175         //draw_funcs[j] (cr, x, y);
 176             switch($j) {
 177                 case 0:
 178                         draw_mask($x,$y);
 179                         break;
 180                 case 1:
 181                         draw_glyphs($x,$y);
 182                         break;
 183                 case 2:
 184                         draw_polygon($x,$y);
 185                         break;
 186                 case 3:
 187                         draw_rects($x,$y);
 188                         break;
 189                 }
 190             $con->restore ();
 191         }
 192     }
 193
 194 $sur->write_to_png("operator-source-php.png");
 195 ?>