JavaScriptda canvas orqali doiralar chizish
Quyidagi arc metodi markazi ma'lum bir nuqtada bo'lgan yoy chizadi. U quyidagi parametrlarni qabul qiladi: x, y, radius r,
boshlang'ich burchak startAngle, oxirgi
burchak endAngle, soat yo'nalishi bo'yicha yoki unga qarshi chizish direction.
direction parametri quyidagi qiymatlarni qabul qiladi: true soat yo'nalishi bo'yicha chizishni belgilaydi, false soat yo'nalishiga qarshi (standart holatda).
Bunda arc metodidagi burchaklar radianlarda o'lchanadi,
graduslarda emas. Graduslarni radianlarga o'tkazish uchun
quyidagi funksiyadan foydalanishingiz mumkin:
function getRadians(degrees) {
return (Math.PI / 180) * degrees;
}
Doira chizamiz
<canvas width="200" height="200" style="background: #f4f4f4;"></canvas>
let canvas = document.querySelector('canvas');
let ctx = canvas.getContext('2d');
ctx.arc(100, 100, 75, 0, getRadians(360));
ctx.stroke();
:
Doiraning yarmini chizamiz
<canvas width="200" height="200" style="background: #f4f4f4;"></canvas>
let canvas = document.querySelector('canvas');
let ctx = canvas.getContext('2d');
ctx.arc(100, 100, 75, 0, getRadians(180));
ctx.stroke();
:
Doiraning yarmini to'ldiramiz
<canvas width="200" height="200" style="background: #f4f4f4;"></canvas>
let canvas = document.querySelector('canvas');
let ctx = canvas.getContext('2d');
ctx.arc(100, 100, 75, 0, getRadians(180));
ctx.fill(); // konturni to'ldiramiz
:
