Metod getContext

Metod getContext canvas bilan ishlashdan oldin chizish kontekstini belgilaydi. Metodning birinchi parametrida kontekst turini - '2d' yoki '3d' ko'rsatamiz, ikkinchisida esa uning atributlarini.

Sintaksis

javascriptcanvas.getContext(kontekst turi, atributlar);

Misol

Keling, getContext yordamida bir canvas yarataylik va unga alpha atributi orqali shaffof fon beraylik, bu brauzerga alfa-kanal mavjudligini ko'rsatadi:

html<canvas id="canvas" width="200" height="200" style="background: #f4f4f4;"></canvas>

javascriptconst canvas = document.getElementById("canvas");
const ctx = canvas.getContext('2d', {alpha: true});

ctx.rect(50, 50, 100, 100);
ctx.fillStyle = 'red';
ctx.fill();

Результат:

Misol

Endi esa keling, shaffof bo'lmagan fon yarataylik:

html<canvas id="canvas" width="200" height="200" style="background: #f4f4f4;"></canvas>

javascriptconst canvas = document.getElementById("canvas");
const ctx = canvas.getContext('2d', {alpha: false});

ctx.rect(50, 50, 100, 100);
ctx.fillStyle = 'red';
ctx.fill();

Результат: