Рисование пути в Canvas с данными SVG Path (пути SVG к путям Canvas) - PullRequest
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Рисование пути в Canvas с данными SVG Path (пути SVG к путям Canvas)

16 голосов
/ 27 февраля 2012

У меня есть подробная карта страны в SVG, разделенная на области в этом формате: 

<path class="state-x-area"
      d="m 575.8672,180.4954 c -0.6572,-0.0938 -2.252,-0.4688 -2.627,-0.375 -1.0313,0.1875 0.375,1.501 -0.1875,1.876 -0.4688,0.1875 -1.0313,-0.0938 -1.501,0.0938 -0.1875,0.0938 0.0938,0.4688 -0.0938,0.6572 -0.9375,0.75 -2.4385,0.8438 -3.377,1.6875 -1.125,1.0322 2.0635,3.6582 0.6572,4.6904 -3.2832,2.3447 -1.2197,-1.5947 -3.377,1.501 -0.2813,0.375 0.8438,0.4688 1.0313,0.9375 0.1875,0.376 -0.9375,0.2822 -0.9375,0.6572 0,0.1875 0.9375,1.4072 0.5625,1.876 -1.0313,1.0313 -2.5322,-0.5635 -3.4707,-0.5635 -1.4063,0 1.3135,1.3135 -1.0313,0.6572 -0.6572,-0.1875 -1.501,-1.2197 -1.7822,-1.7822 -0.1875,-0.1875 -0.376,-0.751 -0.4697,-0.5625 -0.375,0.5625 -0.2813,1.2188 -0.6563,1.6875 -1.2188,1.5947 -2.9082,0 -4.3145,0.4697 -0.1875,0.0938 0.1875,0.4688 0,0.6563 -0.8447,0.4688 -2.5332,0.375 -3.377,0 0,0 0,-0.0938 0.0938,-0.0938 0.4688,-0.4688 1.0313,-0.9375 1.2197,-1.4072 3.2822,0.1875 -0.4697,-2.0635 -1.4072,-2.626 -0.6563,-0.375 0.375,-1.5947 0.1875,-2.0635 -0.1875,-0.4697 -1.6885,0.8438 -1.3135,-0.376 0.2813,-0.8438 2.0635,-1.5938 1.4072,-2.1572 -0.4688,-0.375 -2.627,-0.1875 -2.4385,-1.3125 0.1875,-1.501 2.5322,-1.126 2.7197,-3.002 -0.0938,0 -0.0938,0 -0.1875,0 0.5625,0.0938 1.126,0.1875 1.7822,0.2813 0.75,0.0938 1.501,0.6563 2.251,0.75 0.751,0.0938 1.501,-0.4688 2.252,-0.375 0.4688,0.0938 0.75,0.751 1.2188,0.751 0.1875,0.0938 0.0938,-0.4697 0.2813,-0.5635 0.4697,-0.4688 1.2197,-0.6563 1.6885,-1.2188 0.376,-0.2822 0.0938,-0.9385 0.376,-1.2197 1.7813,-1.4072 3.6582,0.375 5.3457,-0.375 0.5635,-0.2813 0.6572,-1.126 1.2197,-1.3135 0.0938,-0.0938 3.1895,0.375 3.2832,0.2813 0.2813,-0.0938 -0.2813,-0.4688 -0.375,-0.75 -0.2813,-1.501 0.8438,-1.876 2.251,-1.876 0.3752,0 1.1262,2.9072 3.0959,4.502 l 0,0 z"
      style="fill:#000;stroke:#fff;stroke-width:1" />

(И у меня много таких путей.)

Теперь мне нужно, чтобы все было сделано через Canvas (из-за редизайна и совершенно новой задачи, которая должна быть выполнена с этим). Я видел, что в Canvas можно рисовать пути, но можно ли это сделать с помощью таких путей SVG?

1 Ответ

27 голосов
/ 14 июня 2015

В последних версиях Chrome, Firefox и Opera вы могли использовать API Path2D для рисования путей в Canvas на основе данных путей SVG.Конструктор Path2D может дополнительно принимать данные пути SVG в качестве входных данных и генерировать эквивалентный путь в Canvas.

На момент написания статьи не похоже, что этот API поддерживается Internet Explorer и Safari.Итак, если вам нужно поддерживать эти браузеры, вам нужно преобразовать путь SVG в эквивалентные команды Canvas с помощью любого из преобразователей, а затем использовать его.

Путь на Canvas с использованием Path2D API: 

window.onload = function() {
  var canvas = document.getElementById('canvas');
  var ctx = canvas.getContext('2d');
  ctx.strokeStyle = '#000';
  ctx.lineWidth = 1;
  ctx.fillStyle = '#000'

  var p = new Path2D("m 75.8672,80.4954 c -0.6572,-0.0938 -2.252,-0.4688 -2.627,-0.375 -1.0313,0.1875 0.375,1.501 -0.1875,1.876 -0.4688,0.1875 -1.0313,-0.0938 -1.501,0.0938 -0.1875,0.0938 0.0938,0.4688 -0.0938,0.6572 -0.9375,0.75 -2.4385,0.8438 -3.377,1.6875 -1.125,1.0322 2.0635,3.6582 0.6572,4.6904 -3.2832,2.3447 -1.2197,-1.5947 -3.377,1.501 -0.2813,0.375 0.8438,0.4688 1.0313,0.9375 0.1875,0.376 -0.9375,0.2822 -0.9375,0.6572 0,0.1875 0.9375,1.4072 0.5625,1.876 -1.0313,1.0313 -2.5322,-0.5635 -3.4707,-0.5635 -1.4063,0 1.3135,1.3135 -1.0313,0.6572 -0.6572,-0.1875 -1.501,-1.2197 -1.7822,-1.7822 -0.1875,-0.1875 -0.376,-0.751 -0.4697,-0.5625 -0.375,0.5625 -0.2813,1.2188 -0.6563,1.6875 -1.2188,1.5947 -2.9082,0 -4.3145,0.4697 -0.1875,0.0938 0.1875,0.4688 0,0.6563 -0.8447,0.4688 -2.5332,0.375 -3.377,0 0,0 0,-0.0938 0.0938,-0.0938 0.4688,-0.4688 1.0313,-0.9375 1.2197,-1.4072 3.2822,0.1875 -0.4697,-2.0635 -1.4072,-2.626 -0.6563,-0.375 0.375,-1.5947 0.1875,-2.0635 -0.1875,-0.4697 -1.6885,0.8438 -1.3135,-0.376 0.2813,-0.8438 2.0635,-1.5938 1.4072,-2.1572 -0.4688,-0.375 -2.627,-0.1875 -2.4385,-1.3125 0.1875,-1.501 2.5322,-1.126 2.7197,-3.002 -0.0938,0 -0.0938,0 -0.1875,0 0.5625,0.0938 1.126,0.1875 1.7822,0.2813 0.75,0.0938 1.501,0.6563 2.251,0.75 0.751,0.0938 1.501,-0.4688 2.252,-0.375 0.4688,0.0938 0.75,0.751 1.2188,0.751 0.1875,0.0938 0.0938,-0.4697 0.2813,-0.5635 0.4697,-0.4688 1.2197,-0.6563 1.6885,-1.2188 0.376,-0.2822 0.0938,-0.9385 0.376,-1.2197 1.7813,-1.4072 3.6582,0.375 5.3457,-0.375 0.5635,-0.2813 0.6572,-1.126 1.2197,-1.3135 0.0938,-0.0938 3.1895,0.375 3.2832,0.2813 0.2813,-0.0938 -0.2813,-0.4688 -0.375,-0.75 -0.2813,-1.501 0.8438,-1.876 2.251,-1.876 0.3752,0 1.1262,2.9072 3.0959,4.502 l 0,0 z");
  ctx.stroke(p);
  ctx.fill(p);
}
<canvas id='canvas' height='600px' width='600px'></canvas>

SVG Вывод: (для сравнения) 

<svg viewBox='0 0 600 600' height='600px' width='600px'>
  <path class="state-x-area" d="m 75.8672,80.4954 c -0.6572,-0.0938 -2.252,-0.4688 -2.627,-0.375 -1.0313,0.1875 0.375,1.501 -0.1875,1.876 -0.4688,0.1875 -1.0313,-0.0938 -1.501,0.0938 -0.1875,0.0938 0.0938,0.4688 -0.0938,0.6572 -0.9375,0.75 -2.4385,0.8438 -3.377,1.6875 -1.125,1.0322 2.0635,3.6582 0.6572,4.6904 -3.2832,2.3447 -1.2197,-1.5947 -3.377,1.501 -0.2813,0.375 0.8438,0.4688 1.0313,0.9375 0.1875,0.376 -0.9375,0.2822 -0.9375,0.6572 0,0.1875 0.9375,1.4072 0.5625,1.876 -1.0313,1.0313 -2.5322,-0.5635 -3.4707,-0.5635 -1.4063,0 1.3135,1.3135 -1.0313,0.6572 -0.6572,-0.1875 -1.501,-1.2197 -1.7822,-1.7822 -0.1875,-0.1875 -0.376,-0.751 -0.4697,-0.5625 -0.375,0.5625 -0.2813,1.2188 -0.6563,1.6875 -1.2188,1.5947 -2.9082,0 -4.3145,0.4697 -0.1875,0.0938 0.1875,0.4688 0,0.6563 -0.8447,0.4688 -2.5332,0.375 -3.377,0 0,0 0,-0.0938 0.0938,-0.0938 0.4688,-0.4688 1.0313,-0.9375 1.2197,-1.4072 3.2822,0.1875 -0.4697,-2.0635 -1.4072,-2.626 -0.6563,-0.375 0.375,-1.5947 0.1875,-2.0635 -0.1875,-0.4697 -1.6885,0.8438 -1.3135,-0.376 0.2813,-0.8438 2.0635,-1.5938 1.4072,-2.1572 -0.4688,-0.375 -2.627,-0.1875 -2.4385,-1.3125 0.1875,-1.501 2.5322,-1.126 2.7197,-3.002 -0.0938,0 -0.0938,0 -0.1875,0 0.5625,0.0938 1.126,0.1875 1.7822,0.2813 0.75,0.0938 1.501,0.6563 2.251,0.75 0.751,0.0938 1.501,-0.4688 2.252,-0.375 0.4688,0.0938 0.75,0.751 1.2188,0.751 0.1875,0.0938 0.0938,-0.4697 0.2813,-0.5635 0.4697,-0.4688 1.2197,-0.6563 1.6885,-1.2188 0.376,-0.2822 0.0938,-0.9385 0.376,-1.2197 1.7813,-1.4072 3.6582,0.375 5.3457,-0.375 0.5635,-0.2813 0.6572,-1.126 1.2197,-1.3135 0.0938,-0.0938 3.1895,0.375 3.2832,0.2813 0.2813,-0.0938 -0.2813,-0.4688 -0.375,-0.75 -0.2813,-1.501 0.8438,-1.876 2.251,-1.876 0.3752,0 1.1262,2.9072 3.0959,4.502 l 0,0 z"
  style="fill:#000;stroke:#fff;stroke-width:1" />
</svg>

Примечание: Я изменил координаты команды moveTo в путях SVG и Canvas, чтобы сделать вывод более видимым без переключенияв полноэкранный режим.

Ссылки:

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