JavaScript Examples Bible - UserWorks Technologies

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JavaScript Examples Bible: The Essential Companion to JavaScript Bible
document.layerObject.clip
Listing 31-4 (continued)
function initializeXY() {
origLayerWidth = document.display.clip.width
origLayerHeight = document.display.clip.height
showValues()
}
function setClip(field) {
var clipVal = parseInt(field.value)
document.display.clip[field.name] = clipVal
showValues()
}
function showValues() {
var form = document.layers[0].document.forms[0]
var propName
for (var i = 0; i < form.elements.length; i++) {
propName = form.elements[i].name
if (form.elements[i].type == “text”) {
form.elements[i].value = document.display.clip[propName]
}
}
}
var intervalID
function revealClip() {
var midWidth = Math.round(origLayerWidth /2)
var midHeight = Math.round(origLayerHeight /2)
document.display.clip.left = midWidth
document.display.clip.top = midHeight
document.display.clip.right = midWidth
document.display.clip.bottom = midHeight
intervalID = setInterval(“stepClip()”,1)
}
function stepClip() {
var widthDone = false
var heightDone = false
if (document.display.clip.left > 0) {
document.display.clip.left += -2
document.display.clip.right += 2
} else {
widthDone = true
}
if (document.display.clip.top > 0) {
document.display.clip.top += -1
document.display.clip.bottom += 1
} else {
heightDone = true
}
showValues()
if (widthDone && heightDone) {
clearInterval(intervalID)