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4. An graph application with an image in the background

         The mechanism while having an image in your background

    In some cases, maybe you want to load an image for background reference when your application startup, you can easily accomplish it wih JFLayer right now!

    The mechanism is just use JFLayer as a multi-layer solution, to load an image in the background layer, and draw shapes on the other layers. So easy.

         Sample codes of this issue.

................

//Action: create a draw panel
//Desc: A DrawPane object packaged a vertical ruler, a horizontal ruler and a drawing canvas
DrawPane panel =new DrawPane();

//set drawing
Sample2.setDrawing(panel);

//Action: get the draw canvas which is inside of a DrawPane object.
//Desc: A DrawCanvas object is used to draw all of the shapes
DrawCanvas canvas =panel.getDrawCanvas();

//Action: get the page object which is insde of a DrawCanvas object.
//Desc: A JFPage object is used to store all of the shapes
JFPage page =canvas.getDrawPage();

//set a background image
Sample2.setBackground(canvas,page);

................

................

/**
* Set a background image in layer1, then
* insert a new layer(layer2) at layer index0 for drawing
*/
public static void setBackground(DrawCanvas canvas,JFPage page){
//-------set background image in layer1------------
JFImage image =createImage1(canvas); //method 1
//JFImage image =createImage2(canvas); //method 2

//add this image to current layer(layer1 and index=0)
page.getCurrentLayer().getShapeList().add(image);

//insert a new layer at index0, the set current layer to this layer
JFLayer layer =new JFLayer();
page.insertLayer(layer,0);

//now, you can start your drawing on this new layer,
// and with an image in your background layer.
}

   Screenshot of this sample.

    Ok, please notice the setBackground method above, all the preparations have been done in this method. And now you can take a look its screenshot here.

  To get full source code of this sample.

    You can download the full sample source code package here. Then open the file at sample2/Sample2.java for detail informations.

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