最后一個場景出現黑色背景

Question

我有一個問題，一旦熱氣球降落到地面，就會出現黑色背景。

// a switch case based on state with appropriate calls
switch (state) {
// scene 1
case 1:     
    drawBackground1(); // the first background to appear
    drawSlogan1(); // display the first slogan
    break;
// scene 2
case 2:     
    drawBackground2(); // the second background to appear
    drawSlogan2(); // display the second slogan
    break;
// scene 3
case 3:     
    drawBackground1(); // the third background to appear
    drawSlogan3(); // display the last slogan
    break;
}

我在這里顯示此代碼是因為這是我更改的唯一代碼，使黑色背景出現。

點擊這里查看完整代碼

Answer 1

當零件序號到達最終位置時， state為0。如果state == 0 ，也必須繪制背景：

switch (state) {
case 0: 
    drawBackground1(); // the third background to appear
    break;
case 1:     
    drawBackground1(); // the first background to appear
    drawSlogan1(); // display the first slogan
    break;
case 2:     
    drawBackground2(); // the second background to appear
    drawSlogan2(); // display the second slogan
    break;
case 3:     
    drawBackground1(); // the third background to appear
    drawSlogan3(); // display the last slogan
    break;
}