/*
JavaScript Bible, Fourth Edition
by Danny Goodman
John Wiley & Sons CopyRight 2001
*/
Layer Clip
var origLayerWidth = 0
var origLayerHeight = 0
var currTop, currRight, currBottom, currLeft
function init() {
origLayerWidth = parseInt(document.getElementById("display").style.width)
origLayerHeight = parseInt(document.getElementById("display").style.height)
currTop = 0
currRight = origLayerWidth
currBottom = origLayerHeight
currLeft = 0
showValues()
}
function setClip(field) {
var val = parseInt(field.value)
switch (field.name) {
case "top" :
currTop = val
break
case "right" :
currRight = val
break
case "bottom" :
currBottom = val
break
case "left" :
currLeft = val
break
case "width" :
currRight = currLeft + val
break
case "height" :
currBottom = currTop + val
break
}
adjustClip()
showValues()
}
function adjustClip() {
document.getElementById("display").style.clip = "rect(" + currTop + "px " +
currRight + "px " + currBottom + "px " + currLeft + "px)"
}
function showValues() {
var form = document.forms[0]
form.top.value = currTop
form.right.value = currRight
form.bottom.value = currBottom
form.left.value = currLeft
form.width.value = currRight - currLeft
form.height.value = currBottom - currTop
}
var intervalID
function revealClip() {
var midWidth = Math.round(origLayerWidth /2)
var midHeight = Math.round(origLayerHeight /2)
currTop = midHeight
currBottom = midHeight
currRight = midWidth
currLeft = midWidth
intervalID = setInterval("stepClip()",1)
}
function stepClip() {
var widthDone = false
var heightDone = false
if (currLeft > 0) {
currLeft += -2
currRight += 2
} else {
widthDone = true
}
if (currTop > 0) {
currTop += -1
currBottom += 1
} else {
heightDone = true
}
adjustClip()
showValues()
if (widthDone && heightDone) {
clearInterval(intervalID)
}
}
Layer Clipping Properties (W3C)
Enter new clipping values to adjust the visible area of the layer.
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or
abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the
government for a redress of grievances.