First look at the effect chart:
First create a 600x600 pixel canvas, you can also set other suitable size. Set the background color black. Draw a 300x200 pixel rectangle in the middle of the screen and set the feather feather value to 100 in the property panel.
Sets the fill to a gradient/gradient-->folds/folding gradient, which fades from red to white. Click the gradient handle on the graphic to pull it horizontally, and the whole pattern now looks like a feathered barcode.
Now change the gradient color from black to white and into a bitmap.
Right-click on the bitmap to pull up pop-up menu, select transform/deformation-->skew/oblique, select the bottom of the control point outward stretching to near the edge of the screen. Now you have a big trapezoid already far beyond the canvas range, across the screen. Don't worry, go directly to the property panel to change the width of the graphic to 60 pixels, and drag it to the middle of the canvas, which is the first beam we want to prototype.