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根據變數建模類型動態變更圖形產生器圖表類型

本節介紹如何動態變更圖形產生器中的元素類型，取決於使用者在列切換器中選擇連續或分類 x 軸變數。元素是在圖形產生器選項板頂部顯示為圖示的圖形類型。對於連續輸入，新增了一個單選按鈕，讓使用者可以在擬合線和輪廓之間進行選擇。當為非 JMP 專家並且只需要有限數量的選項的人建立互動式圖表時，此秘訣非常有用。

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原料：

• 圖形產生器
• 表達式處理

範例資料表– 大班難度– 困難

腳步

1. Start with 名稱預設為此處(1) and open 大班.

   Names Default To Here( 1 );
   dt = Open( "$SAMPLE_DATA/Big Class.jmp" );

2. Create a function which sends a message to the 圖形產生器 platform that removes the existing element then adds a new one. It assumes that the 積分 element is already displayed and is element number 1, therefore the element to be removed is number 2.

   // This function changes the type of chart being displayed.
   // It takes a reference to a Graph Builder report (gbr) and the chart type required (gr)
   // At the moment it assumes the Points element will always be included
   changeElement = function( {gbr, gr},
   	{default local},
   	Eval(
   		Substitute(
   			Expr(
   				gbr << remove element( 1, 1, 2 ) << add element( 1, 1, {Type( __aa__ ), X, Y} )
   			), Expr( __aa__ ), gr
   		)
   	)
   );

3. Create the new window which contains the column switcher (CS) to change the x-axis, a radio box (RB) to control the element type for continuous variables, and the Graph Builder (國標).
   

   rb_out = "Line of Fit"; 
   win1 = New Window( "Demo",
   	Text Box(
   		"Column switching between continuous and nominal variables will change line of fit to box plots",
   		<<SET wrap=""></SET>

   <P>列切換器是在圖形生成器外部特意創建的，因此我們可以稍後創建一個函數，以便在切換器更改時採取操作。</P>

<OL start="6"> <LI>Link the column switcher <FONT face="courier new,courier">CS</FONT> to the Graph Builder <FONT face="courier new,courier">國標</FONT> <PRE><CODE class=" language-jsl">cs << link platform( gb ); Create a Column Switch Handler. The function post is called by the handler once the change has been completed. The format comes directly from the Scripting Index.

post = Function( {previousColumn, currentColumn, switcher},
	gbr = Report( gb )[GraphBuilderBox( 1 )];
	If( Column( dt, cs << get current ) << get modeling type == "Continuous",
		changeElement( gbr, rb_out ),
		changeElement( gbr, "Box Plot" )
	);
);
cs << Make Column Switch Handler( 1, post );

請注意，切換完成之前不需要發生任何事情，因此Make Column Switch Handler的第一個參數不執行任何操作。

Finally, start the column switcher running for demo purposes.

cs << run();

潛在的變化：

• 建立一個「預」更改函數，該函數迭代圖形產生器中的現有元素（使用<< Get Elements ），找到需要刪除的元素並以程式設計方式設定<< remove element 中的第三個參數（而不是依賴它）是第二個元素）。

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