class BaseObject {
    constructor(x, y, speed, angle, width, height) {
        this.x = x;
        this.y = y;
        this.speed = speed;
        this.angle = angle;
        this.width = width;
        this.height = height;
        this.color = "blue";
    }
    render(canvas) {
        canvas.save();
        let hw = this.width / 2;
        let hh = this.height / 2;
        canvas.translate(this.x + hw, this.y + hh);
        canvas.fillStyle = this.color;
        let rad = this.degToRad(this.angle);
        canvas.rotate(rad);
        canvas.fillRect(-hw, -hh, this.width, this.height);
        canvas.restore();
        canvas.fillStyle = "#0000FF";
        canvas.beginPath();
        let leftTop = this.getLeftTopPoint();
        canvas.arc(leftTop.x, leftTop.y, 5, 0, Math.PI * 2, true);
        canvas.fill();
        canvas.beginPath();
        let rightBottom = this.getRightBottomPoint();
        canvas.arc(rightBottom.x, rightBottom.y, 5, 0, Math.PI * 2, true);
        canvas.fill();
    }
    forward() {
        let d = this.theoremSin(this.angle + 90, this.speed);
        this.x += d.deltaX;
        this.y += d.deltaY;
    }

    theoremSin(angle, distance) {
        let alpha = angle;
        let beta = 90 - alpha;
        let gamma = Math.PI / 2;
        let deltaX = Math.sin(this.degToRad(beta)) * distance
                     / Math.sin(gamma);
        let deltaY = Math.sin(this.degToRad(alpha)) * distance
                     / Math.sin(gamma);
        return { deltaX, deltaY }
    }

    degToRad(deg) {
        return deg * Math.PI / 180;
    }
    collision() {

    }

    // возвращает объект с полями x и y
    getLeftTopPoint() {
        let hw = this.width / 2;
        let hh = this.height / 2;
        let point = this.rotatePoint(-hw, -hh, this.angle);
        return {x: point.x + this.x + hw, y: point.y + this.y + hh}
    }

    // возвращает объект с полями x и y
    getRightBottomPoint() {
        let hw = this.width / 2;
        let hh = this.height / 2;
        let point = this.rotatePoint(hw, hh, this.angle);
        return {x: point.x + this.x + hw, y: point.y + this.y + hh}
    }

    isPointInObject(point) {

    }

    rotatePoint(x, y, angle) {
        let a = this.degToRad(angle);
        let x1 = x * Math.cos(a) - y * Math.sin(a);
        let y1 = x * Math.sin(a) + y * Math.cos(a);
        return {x: x1, y: y1}
    }
}