testcases/phpCairo/clip-operator.php

   1 <?
   2 $width = 16;
   3 $height = 16;
   4 $pad = 2;
   5 $noperator = 1 + OPERATOR_SATURATE - OPERATOR_CLEAR;
   6 $imagewidth = $noperator * ($width + $pad) + $pad;
   7 $imageheight = 4 * ($height + $pad) + $pad;
   8 $sur = new CairoImageSurface(FORMAT_ARGB32, $imagewidth, $imageheight);
   9 $con = new CairoContext($sur);
  10 $con->select_font_face("Bitstream Vera Sans");
  11 $con->set_font_size(0.9 * $height);
  12
  13 for($i=0; $i < 4; $i++) {
  14         for($op = OPERATOR_CLEAR; $op < $noperator; $op++) {
  15                 $x = $op *($width + $pad) + $pad;
  16                 $y = $i * ($height + $pad) + $pad;
  17
  18                 $con->save();
  19                 $pat = new CairoLinearGradient($x + $width, $y, $x, $y + $height);
  20                 $pat->add_color_stop_rgba(0.2,0,0,1,1);
  21         $pat->add_color_stop_rgba(0.8,0,0,1,0);
  22
  23                 $con->set_source($pat);
  24                 $con->rectangle($x, $y, $width, $height);
  25                 $con->fill();
  26                 $con->set_operator($op);
  27                 $con->set_source_rgb(1,0,0);
  28                 $con->move_to($x,$y);
  29                 $con->line_to($x+$width, $y);
  30                 $con->line_to($x, $y+$height);
  31                 $con->clip();
  32
  33                 switch($i) {
  34                 case 0:
  35                         $wi = floor($width * 0.9);
  36                         $he = floor($height * 0.9);
  37                         $x += 0.05 * $width;
  38                         $y += 0.05 * $height;
  39
  40                         //$stemp = $con->get_group_target();
  41                         $msur = $sur->create_similar(CONTENT_ALPHA, $wi, $he);
  42
  43                         $c2 = new CairoContext($msur);
  44                         $c2->save();
  45                         $c2->set_source_rgba(0,0,0,0);
  46                         $c2->set_operator(OPERATOR_SOURCE);
  47                         $c2->paint();
  48                         $c2->restore();
  49
  50                         $c2->set_source_rgb(1,1,1);
  51                         $c2->arc(0.5 * $wi, 0.5 * $he, 0.45 * $he, 0, 2 * M_PI);
  52                         $c2->fill();
  53                         //unset($c2);
  54
  55                         $con->mask_surface($msur, $x, $y);
  56                         //unset($msur);
  57                         //unset($stemp);
  58                         break;
  59
  60                 case 1:
  61                         $con->set_font_size(0.9 * $height);
  62                         $ext = $con->text_extents("FG");
  63                         $con->move_to($x + floor(($width - $ext["width"])/2 + 0.5) - $ext["x_bearing"], $y + floor(($height - $ext["height"])/2 + 0.5) - $ext["y_bearing"]);
  64                         $con->show_text("FG");
  65                         break;
  66
  67                 case 2:
  68             $wi = floor($width * 9 / 10);
  69             $he = floor($height * 9 / 10);
  70             $x += 0.05 * $width;
  71             $y += 0.05 * $height;
  72                         $con->new_path();
  73                         $con->move_to($x, $y);
  74                         $con->line_to($x, $y + $he);
  75                         $con->line_to($x + $wi/2, $y + 3 * $he/4);
  76                         $con->line_to($x + $wi, $y + $he);
  77                         $con->line_to($x+$wi, $y);
  78                         $con->line_to($x + $wi/2, $y + $he/4);
  79                         $con->close_path();
  80                         $con->fill();
  81                         break;
  82
  83                 case 3:
  84                         $bw = floor(0.33 * $width + 0.5);
  85                         $bh = floor(0.33 * $height + 0.5);
  86
  87                         for($t1 = 0; $t1 < 3; $t1++)
  88                                 for($t2 = 0; $t2 < 3; $t2++)
  89                                         if (($t1 + $t2) % 2 == 0)
  90                                                 $con->rectangle($x + $bw*$t1, $y + $bh*$t2, $bw, $bh);
  91                                 $con->fill();
  92
  93
  94                         break;
  95                 }
  96                 $con->restore();
  97         }
  98 }
  99 $sur->write_to_png("clip-operator-php.png");
 100 ?>
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