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Tutorials » Special_Effects

Real Time Magnifying Glass
Author: Boban Klasnikov | Website: www.PowerOfArt.com |

Dragging The Mask

Now we have a perfect Mask effect that we can drag. Problem is that everytime we drag the mask, it drags the masked layer underneath it because they are both in the same movie clip, outline. The results is it consistently presents the same part of the image under the magnifying glass. To get around this, we have to make the movie clip bigpic move in the opposite direction for the same amount of movement magnifier does. This was done with the following action script placed in the second frame of the main timeline. (see below)

Set Variable: "x_mask" = GetProperty (outline ,_x)
Set Variable: "y_mask" = GetProperty(outline,_y)
Set Property ("/outline/bigpic", X Position) = (200- x_mask)
Set Property ("/outline/bigpic", Y Position) = (200 - y_mask)

x_mask is the horizontal distance between the center of movie clip outline and the left upper corner of the stage (read Macromedia's Flash users guide, Flash bible or any Flash instructional book), y_mask is vertical distance between same elements.

Given the whole movie is 400 x 400 pixels, if outline movie clip moves for an amount of x_mask, then we want bigpic to move the same amount in the opposite direction. When x_mask or y_mask variable are read, the difference between real position of movie clip bigpic and position we want it to be would be as follows:

Moving the magnifier to the left for 50px from center, its position is initially 200px (what is X distance from left upper corner of the main movie) minus 50 equals 150. If we subtract 150 (or x_mask value of this example ) from the total distance from the center to the left edge which is 200, we end up with 50 px, the distance that bigpic will move to the right to portray the visual effect of staying still.

Have a play with the example again to get a better picture...

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