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Author: Galego | Website:

The Zoom Slider (Part 2)

Add a second frame to the clip and use the following code...

Code for frame 1

// the x-coord is the starting point of the slider knob
x_coord = 650;
// 700 is as far as the
x_limit = 700;
if (mouse_down eq "true") {
	play ();
} else {
	stop ();

Code for frame 2

//get the current x of the knob and compare it to what it was previously to see if we need to update anything
var cur_x = _root.zoom_knob._x;
if (Number(cur_x)<>Number(prev_x)) {
	//the x has changed...use this *simple* equation below 
	// It's based on 50 px movement, 400% zoom & a base mag_factor of 5 (that's where the 6 comes from)
	var zoom_perc = 400 - (6*(x_limit - cur_x)); 
	// Figure out the inverse percentage for the magnifying glass
	// 20 is the maximum mag_factor (400% with a base mag_factor of 5 and defaulted at 100%)
	var mag_perc = (100/zoom_perc)*20;
	// Call the scaling function and moving function
// Set the current x as previous and do it long as the knob is moving
prev_x = cur_x;
gotoAndPlay (1);
This code works like the panning routine in the 'mag' MC. Like that one you could also put frame 2's code in the MC using OnClipEvent(EnterFrame).
Note: You could do a vertical zoom (track _y instead of _x).
» Level Advanced

Added: 2002-08-20
Rating: 8 Votes: 21
(10 being the highest)
» Author
Galego (aka Jason White) is an Instructional Designer and a Capoeirista from Grupo CapuraGinga.
» Download
Download the files used in this tutorial.
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