/** 各种辅助方法来辅助绘图 */
class DrawUtils {
    public static drawLine(shape: egret.Shape, start: Vector2, end: Vector2, color: number, thickness: number = 1){
        this.drawLineAngle(shape, start, MathHelper.angleBetweenVectors(start, end), Vector2.distance(start, end), color, thickness);
    }

    public static drawLineAngle(shape: egret.Shape, start: Vector2, radians: number, length: number, color: number, thickness = 1){
        shape.graphics.beginFill(color);
        shape.graphics.drawRect(start.x, start.y, 1, 1);
        shape.graphics.endFill();

        shape.scaleX = length;
        shape.scaleY = thickness;
        shape.$anchorOffsetX = 0;
        shape.$anchorOffsetY = 0;
        shape.rotation = radians;
    }

    public static drawHollowRect(shape: egret.Shape, rect: Rectangle, color: number, thickness = 1){
        this.drawHollowRectR(shape, rect.x, rect.y, rect.width, rect.height, color, thickness);
    }

    public static drawHollowRectR(shape: egret.Shape, x: number, y: number, width: number, height: number, color: number, thickness = 1){
        let tl = new Vector2(x, y).round();
        let tr = new Vector2(x + width, y).round();
        let br = new Vector2(x + width, y + height).round();
        let bl = new Vector2(x, y + height).round();

        this.drawLine(shape, tl, tr, color, thickness);
        this.drawLine(shape, tr, br, color, thickness);
        this.drawLine(shape, br, bl, color, thickness);
        this.drawLine(shape, bl, tl, color, thickness);
    }

    public static drawPixel(shape: egret.Shape, position: Vector2, color: number, size: number = 1){
        let destRect = new Rectangle(position.x, position.y, size, size);
        if (size != 1){
            destRect.x -= size * 0.5;
            destRect.y -= size * 0.5;
        }

        shape.graphics.beginFill(color);
        shape.graphics.drawRect(destRect.x, destRect.y, destRect.width, destRect.height);
        shape.graphics.endFill();
    }
}