HTML tuvali globalCompositeOperation Özellik
Örnek
İki farklı globalCompositeOperation değeri kullanarak dikdörtgenler çizin. Kırmızı dikdörtgenler hedef görüntülerdir . Mavi dikdörtgenler kaynak resimlerdir :
kaynak üzerinden
varış noktası
JavaScript:
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(20, 20, 75, 50);
ctx.globalCompositeOperation = "source-over";
ctx.fillStyle = "blue";
ctx.fillRect(50, 50, 75, 50);
ctx.fillStyle = "red";
ctx.fillRect(150, 20, 75, 50);
ctx.globalCompositeOperation = "destination-over";
ctx.fillStyle = "blue";
ctx.fillRect(180, 50, 75, 50);
Tarayıcı Desteği
Internet Explorer 9, Firefox, Opera, Chrome ve Safari, globalCompositeOperation özelliğini destekler.
Tanım ve Kullanım
globalCompositeOperation özelliği, bir kaynak (yeni) görüntünün hedef (mevcut) görüntüye nasıl çizileceğini ayarlar veya döndürür.
kaynak görüntü = tuvale yerleştirmek üzere olduğunuz çizimler.
hedef görüntü = tuvale önceden yerleştirilmiş çizimler.
| Varsayılan değer: | kaynak üzerinden |
|---|---|
| JavaScript sözdizimi: | bağlam .globalCompositeOperation="source-in"; |
Mülk değerleri
| Value | Description | Play it |
|---|---|---|
| source-over | Default. Displays the source image over the destination image | |
| source-atop | Displays the source image on top of the destination image. The part of the source image that is outside the destination image is not shown | |
| source-in | Displays the source image in to the destination image. Only the part of the source image that is INSIDE the destination image is shown, and the destination image is transparent | |
| source-out | Displays the source image out of the destination image. Only the part of the source image that is OUTSIDE the destination image is shown, and the destination image is transparent | |
| destination-over | Displays the destination image over the source image | |
| destination-atop | Displays the destination image on top of the source image. The part of the destination image that is outside the source image is not shown | |
| destination-in | Displays the destination image in to the source image. Only the part of the destination image that is INSIDE the source image is shown, and the source image is transparent | |
| destination-out | Displays the destination image out of the source image. Only the part of the destination image that is OUTSIDE the source image is shown, and the source image is transparent | |
| lighter | Displays the source image + the destination image | |
| copy | Displays the source image. The destination image is ignored | |
| xor | The source image is combined by using an exclusive OR with the destination image |
Örnek
Tüm globalCompositeOperation özellik değerleri: