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
Tablodaki sayılar, özelliği tam olarak destekleyen ilk tarayıcı sürümünü belirtir.
Property | |||||
---|---|---|---|---|---|
globalCompositeOperation | 4.0 | 9.0 | 3.6 | 4.0 | 10.1 |
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 = "kaynak girişi"; |
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: