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<title>Listing 35.13. A Wipe Transition for the Incoming Slide</title>
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dhtml_objects['viewer2'].set_visibility("hidden")
// Put in the main image
dhtml_objects['viewer1'].set_html('<img src="' + slides[current_slide].src + '">')
// Reset it for full viewing
dhtml_objects['viewer1'].move_to(viewer_data.left, viewer_data.top)
dhtml_objects['viewer1'].resize_clip_to(0, viewer_data.width, viewer_data.height, 0)
// select a random transition
viewer_data.transition = transitions[Math.floor(transitions.length * Math.random())]
viewer_data.h_direction = h_directions[Math.floor(h_directions.length * Math.random())]
viewer_data.v_direction = v_directions[Math.floor(v_directions.length * Math.random())]
// Set the scrolling flag
scrolling = true
// update the controls
write_controls()
if (viewer_data.transition == "slide") {
slide_out()
}
else {
wipe_out()
}
}
function next_slide() {
// Change the pending slide number
pending_slide = current_slide + 1
initialize_viewer()
}
function previous_slide() {
// Change the pending slide number
pending_slide = current_slide - 1
initialize_viewer()
}
function slide_out() {
// Check the width and height of the object's clip region
if (dhtml_objects['viewer1'].get_clip_width() > 0 &&
dhtml_objects['viewer1'].get_clip_height() > 0) {
// If both are still positive, keep sliding
var horizontal_move = 0
var vertical_move = 0
var top_resize = 0
var right_resize = 0
var bottom_resize = 0
var left_resize = 0
// Get the horizontal adjustments
if (viewer_data.h_direction == "left") {
horizontal_move = -viewer_data.scrollamount
left_resize = viewer_data.scrollamount
}
else if (viewer_data.h_direction == "right") {
horizontal_move = viewer_data.scrollamount
right_resize = -viewer_data.scrollamount
}
else if (viewer_data.h_direction == "both") {
left_resize = viewer_data.scrollamount
right_resize = -viewer_data.scrollamount
}
// Get the vertical adjustments
if (viewer_data.v_direction == "down") {
vertical_move = viewer_data.scrollamount
bottom_resize = -viewer_data.scrollamount
}
else if (viewer_data.v_direction == "up") {
vertical_move = -viewer_data.scrollamount
top_resize = viewer_data.scrollamount
}
else if (viewer_data.v_direction == "both") {
bottom_resize = -viewer_data.scrollamount
top_resize = viewer_data.scrollamount
}
// Move the object
dhtml_objects['viewer1'].move_by(horizontal_move, vertical_move)
// Adjust the clip region
dhtml_objects['viewer1'].resize_clip_by(top_resize,
right_resize,
bottom_resize,
left_resize)
// Set a new timeout
timeout_id = setTimeout("slide_out()", viewer_data.scrolldelay)
write_controls()
}
else {
// Clear the timeout
clearTimeout(timeout_id)
// The pending slide is now the current slide
current_slide = pending_slide
// Prepare the incoming slide
prepare_next_slide()
}
}
function wipe_out() {
// Check the width and height of the object's clip region
if (dhtml_objects['viewer1'].get_clip_width() > 0 &&
dhtml_objects['viewer1'].get_clip_height() > 0) {
// If both are still positive, keep wiping
var top_resize = 0
var right_resize = 0
var bottom_resize = 0
var left_resize = 0
// Get the horizontal adjustments
if (viewer_data.h_direction == "left") {
right_resize = -viewer_data.scrollamount
}
else if (viewer_data.h_direction == "right") {
left_resize = viewer_data.scrollamount
}
else if (viewer_data.h_direction == "both") {
left_resize = viewer_data.scrollamount
right_resize = -viewer_data.scrollamount
}
// Get the vertical adjustments
if (viewer_data.v_direction == "down") {
top_resize = viewer_data.scrollamount
}
else if (viewer_data.v_direction == "up") {
bottom_resize = -viewer_data.scrollamount
}
else if (viewer_data.v_direction == "both") {
bottom_resize = -viewer_data.scrollamount
top_resize = viewer_data.scrollamount
}
// Adjust the clip region
dhtml_objects['viewer1'].resize_clip_by(top_resize,
right_resize,
bottom_resize,
left_resize)
// Set a new timeout
timeout_id = setTimeout("wipe_out()", viewer_data.scrolldelay)
}
else {
// Clear the timeout
clearTimeout(timeout_id)
// The pending slide is now the current slide
current_slide = pending_slide
// Prepare the incoming slide
prepare_next_slide()
}
}
function stop_it() {
// Shut down the viewer by clearing the current timeout
clearTimeout(timeout_id)
// Clear the scrolling flag
scrolling = false
// update the controls
write_controls()
}
function prepare_next_slide() {
// select a random wipe transition
viewer_data.transition = "wipe"
viewer_data.h_direction = h_directions[Math.floor(h_directions.length * Math.random())]
viewer_data.v_direction = v_directions[Math.floor(v_directions.length * Math.random())]
var top_clip_start = 0
var right_clip_start = viewer_data.width
var bottom_clip_start = viewer_data.height
var left_clip_start = 0
// Get the horizontal adjustments
if (viewer_data.h_direction == "left") {
left_clip_start = viewer_data.width
}
else if (viewer_data.h_direction == "right") {
right_clip_start = 0
}
else if (viewer_data.h_direction == "both") {
left_clip_start = Math.floor(viewer_data.width / 2)
right_clip_start = Math.floor(viewer_data.width / 2)
}
// Get the vertical adjustments
if (viewer_data.v_direction == "down") {
bottom_clip_start = 0
}
else if (viewer_data.v_direction == "up") {
top_clip_start = viewer_data.height
}
else if (viewer_data.v_direction == "both") {
bottom_clip_start = Math.floor(viewer_data.height / 2)
top_clip_start = Math.floor(viewer_data.height / 2)
}
// Add the image
dhtml_objects['viewer2'].set_html('<img src="' + slides[current_slide].src + '">')
// Make the object visible
dhtml_objects['viewer2'].set_visibility("visible")
// Resize it
dhtml_objects['viewer2'].resize_clip_to(top_clip_start,
right_clip_start,
bottom_clip_start,
left_clip_start)
// Do the wipe transition
wipe_in()
}
function wipe_in() {
// Compare the clip width and height with the object width and height
if (dhtml_objects['viewer2'].get_clip_width() < viewer_data.width ||
dhtml_objects['viewer2'].get_clip_height() < viewer_data.height) {
// If either one is less, keep wiping
var top_resize = 0
var right_resize = 0
var bottom_resize = 0
var left_resize = 0
// Get the horizontal adjustments
if (viewer_data.h_direction == "left") {
left_resize = -viewer_data.scrollamount
}
else if (viewer_data.h_direction == "right") {
right_resize = viewer_data.scrollamount
}
else if (viewer_data.h_direction == "both") {
left_resize = -viewer_data.scrollamount
right_resize = viewer_data.scrollamount
}
// Get the vertical adjustments
if (viewer_data.v_direction == "down") {
bottom_resize = viewer_data.scrollamount
}
else if (viewer_data.v_direction == "up") {
top_resize = -viewer_data.scrollamount
}
else if (viewer_data.v_direction == "both") {
bottom_resize = viewer_data.scrollamount
top_resize = -viewer_data.scrollamount
}
// Adjust the clip region
dhtml_objects['viewer2'].resize_clip_by(top_resize,
right_resize,
bottom_resize,
left_resize)
// Set a new timeout
timeout_id = setTimeout("wipe_in()", viewer_data.scrolldelay)
}
else {
stop_it()
}
}
function write_controls() {
// Write the slide number
if (scrolling) {
slide_text = "Loading the next slide...<p>"
}
else {
slide_text = "Slide #" + eval(current_slide + 1) + "—" + slides[current_slide].caption + "<p>"
}
if (current_slide == 0 || scrolling) {
previous_control = "Previous"
}
else {
previous_control = '<a href="javascript:previous_slide()">Previous</a>'
}
if (current_slide == slides.length - 1 || scrolling) {
next_control = "Next"
}
else {
next_control = '<a href="javascript:next_slide()">Next</a>'
}
dhtml_objects["controls"].set_html(slide_text + previous_control + " " + next_control)
}
//-->
</script>
</head>
<body onLoad="initialize()">
<!--IE needs to have the positioning inside the tag -->
<div id="viewer1" style="position:absolute; left:10; top:0">
<img src="http://www.mcfedries.com/graphics/fiesole1.jpg">
</div>
<div id="viewer2" style="position:absolute; left:10; top:0"></div>
<div id="controls" style="position:absolute; left:10; top:325; width: 525; text-align: center; font-weight:bold"></div>
</div>
</body>
</html>
