Question

我正在尝试从我创建的一系列书籍中创建一个书架，并且如果＆＃34;推荐＆＃34;则通过对角线书写一本书。该书的财产是＆＃34; false＆＃34;。您可以在我的for循环中看到我尝试使用以下if语句执行此操作：

if(books[i].recommended === false)
{
    fill(0, 0, 0);
    line(bookX,bookY,bookX+90,bookY+100);
}

但是我的问题是我在for循环中创建的行在后面，在我的书后面，因此是不可见的。我怎样才能让它走到前台呢？

以下完整代码：

//I create my array with my books
var books = [];

for(var y = 1;y<=20;y++)
{
    books.push(
        {
            title: "Book "+y,
            stars: random(4),
            author: "Author "+y,
            color: color(random(255), random(255), random(255)),
            recommended: !!Math.floor(Math.random() * 2)
        }
        );
}

// Loop to draw 3 shelves
var shelfY = 105;
while (shelfY<=360)
{
    fill(173, 117, 33);
    rect(0, shelfY, width, 10);
    shelfY +=120;
}

// Loop to draw all my books
var bookX = 5;
var bookY = 5;
for (var i = 0; i<books.length; i++)
{
    fill(books[i].color);
    rect(bookX, bookY, 90, 100);
    fill(0, 0, 0);
    text(books[i].title, bookX+5, bookY+9, 70, 100);
    text(books[i].author, bookX+5, bookY+24, 70, 100);

    for (var j = 0; j < books[i].stars; j++) 
    {
        image(getImage("cute/Star"), bookX+3 + j * 20, bookY+70,20, 30);
    }

    bookX += 100;

    if(bookX>400)
    {
        bookX = 5;
        bookY += 120;
    }

    if(books[i].recommended === false)
    {
        fill(0, 0, 0);
        line(bookX,bookY,bookX+90,bookY+100);
    }
}

Answer 1

你在增加bookX和bookY后画线，所以它不会在正确的地方画出。

尝试将你的if（books [i] .recommended等...放在bookX + = 100之前;它会起作用。

这是最终的代码：

//I create my array with my books
var books = [];

for(var y = 1;y<=20;y++)
{
    books.push(
        {
            title: "Book "+y,
            stars: random(4),
            author: "Author "+y,
            color: color(random(255), random(255), random(255)),
            recommended: !!Math.floor(Math.random() * 2)
        }
        );
}

// Loop to draw 3 shelves
var shelfY = 105;
while (shelfY<=360)
{
    fill(173, 117, 33);
    rect(0, shelfY, width, 10);
    shelfY +=120;
}

// Loop to draw all my books
var bookX = 5;
var bookY = 5;
for (var i = 0; i<books.length; i++)
{
    fill(books[i].color);
    rect(bookX, bookY, 90, 100);
    fill(0, 0, 0);
    text(books[i].title, bookX+5, bookY+9, 70, 100);
    text(books[i].author, bookX+5, bookY+24, 70, 100);

    for (var j = 0; j < books[i].stars; j++) 
    {
        image(getImage("cute/Star"), bookX+3 + j * 20, bookY+70,20, 30);
    }

    if(books[i].recommended === false)
    {
        fill(0, 0, 0);
        line(bookX,bookY,bookX+90,bookY+100);
    }

    bookX += 100;

    if(bookX>400)
    {
        bookX = 5;
        bookY += 120;
    }

}

在for循环中放入一行到前景

1 个答案: