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jquery-svgminimap.js
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jquery-svgminimap.js
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/**
* Created by Daniel on 12-07-2014.
* Based on svgPan - https://github.com/talos/jquery-svgpan
*/
/*global define, jQuery, window*/
(function (factory) {
"use strict";
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['jquery'], factory);
} else {
// Browser globals
factory(jQuery);
}
}(function ($) {
"use strict";
var NONE = 0,
PAN = 1,
DRAG = 2,
init = function (root, svgRoot, brushID, enablePan, enableZoom, enableDrag, zoomScale) {
var state = NONE,
stateTarget,
stateOrigin,
stateTf,
$root = $(root),
$brush = $('#'+brushID),
$parent = $root.parent(),
recentOffset = $root.offset(),
// FF sometimes doesn't calculate this anything near correctly for SVGs.
offsetIsBroken = Math.abs($root.offset().left) > 1e5,
isMouseOverElem = false,
isMouseOverBrushElem = false,
/**
* Dumps a matrix to a string (useful for debug).
*/
dumpMatrix = function (matrix) {
var s = "[ " + matrix.a + ", " + matrix.c + ", " + matrix.e + "\n " + matrix.b + ", " + matrix.d + ", " + matrix.f + "]";
return s;
},
/**
* Instance an SVGPoint object with given event coordinates.
*/
getEventPoint = function (evt) {
var p = root.createSVGPoint(),
offsetX = evt.offsetX,
offsetY = evt.offsetY,
offset,
ctm,
matrix;
if (typeof offsetX === "undefined" || typeof offsetY === "undefined") {
offset = offsetIsBroken ? $parent.offset() : recentOffset;
offsetX = evt.pageX - offset.left;
offsetY = evt.pageY - offset.top;
}
p.x = offsetX;
p.y = offsetY;
return p;
},
/**
* Sets the current transform matrix of an element.
*/
setCTM = function (element, matrix) {
var s = "matrix(" + matrix.a + "," + matrix.b + "," + matrix.c + "," + matrix.d + "," + matrix.e + "," + matrix.f + ")";
element.setAttribute("transform", s);
},
zoomCanvas = function (evt, zoomFactor) {
if (!enableZoom) {
return;
}
var z = zoomFactor,
g = svgRoot,
p = getEventPoint(evt),
k;
p = p.matrixTransform(g.getCTM().inverse());
// Compute new scale matrix in current mouse position
k = root.createSVGMatrix().translate(p.x, p.y).scale(z).translate(-p.x, -p.y);
setCTM(g, g.getCTM().multiply(k));
if (typeof stateTf === "undefined") {
stateTf = g.getCTM().inverse();
}
stateTf = stateTf.multiply(k.inverse());
renderBrush();
},
panCanvas = function (dx, dy, dt) {
//Optionally pan with time tween
//set brush coordinates if map was translated.
var vp = document.getElementById("viewport"),
canvasScale = vp.getCTM().a;
var bdx = ($brush.getCTM().e * (scale * canvasScale));
var bdy = ($brush.getCTM().f * (scale * canvasScale));
//Update instead of delete and replace.
$(vp).attr("transform", "matrix(1,0,0,1," + -(bdx) + "," + -(bdy) + ")"); //TODO: Add id and style thru CSS
},
renderBrush = function (tx, ty) {
var brushWidth,
brushHeight,
scale = 20, //TODO: replace this with minimapScale
vp = document.getElementById("viewport"),
canvasScale = vp.getCTM().a,
dx = (vp.getCTM().e ),
dy = (vp.getCTM().f ),
scaleFactor = scale * canvasScale; //get scale from transformation Matrix
brushWidth = (document.documentElement.clientWidth / scale) / canvasScale;
brushHeight = (document.documentElement.clientHeight / scale) / canvasScale;
//console.log("Brush Size - w:" + brushWidth + "h: " + brushHeight + " scaleFactor: " + scaleFactor);
//get coordinates from viewport translate to brush
if (tx) {
dx = +( (tx * scale * canvasScale));
setCTM(vp, vp.getCTM().translate(dx, 0));
}
if (ty) {
dy = +(ty * scale * canvasScale);
setCTM(vp, vp.getCTM().translate(0, dy));
}
//set brush coordinates if map was translated.
var bdx = (vp.getCTM().e / (scale * canvasScale));
var bdy = (vp.getCTM().f / (scale * canvasScale));
//Update instead of delete and replace.
$('#' + brushID).attr("width", brushWidth)
.attr("height", brushHeight)
.attr("style", "fill: #" + Math.floor(Math.random() * 16777215).toString(16) + "; fill-opacity: 0.4;")
.attr("transform", "matrix(1,0,0,1," + -(bdx) + "," + -(bdy) + ")"); //TODO: Add id and style thru CSS
},
/**
* Handle mouse wheel event.
*/
handleMouseWheel = function (evt) {
if (!enableZoom) {
return;
}
if (!isMouseOverElem) {
return;
}
if (evt.preventDefault) {
evt.preventDefault();
}
// evt.returnValue = false;
recentOffset = $root.offset();
var delta = evt.wheelDelta ? evt.wheelDelta / 360 : evt.detail / -9,
z = Math.pow(1 + zoomScale, delta),
g = svgRoot,
p = getEventPoint(evt),
k;
zoomCanvas(evt, z);
},
/**
* Handle mouse move event.
*/
handleMouseMove = function (evt) {
if (evt.preventDefault) {
evt.preventDefault();
}
evt.returnValue = false;
var g = svgRoot,
p;
if (state === PAN && enablePan) {
// Pan mode
p = getEventPoint(evt).matrixTransform(stateTf);
setCTM(g, stateTf.inverse().translate(p.x - stateOrigin.x, p.y - stateOrigin.y));
//console.log("renderBrush()");
renderBrush();
} else if (state === DRAG && enableDrag) {
// Drag mode
p = getEventPoint(evt).matrixTransform(g.getCTM().inverse());
setCTM(stateTarget, root.createSVGMatrix().translate(p.x - stateOrigin.x, p.y - stateOrigin.y).multiply(g.getCTM().inverse()).multiply(stateTarget.getCTM()));
stateOrigin = p;
}
},
/**
* Handle mouseenter event. This has been added to stop ignoring
* inputs when the mouse is over the element.
**/
handleMouseEnter = function (evt) {
// bind our mousemove listener only when we have mouse in view
if (!isMouseOverElem) {
recentOffset = $root.offset();
$root.bind('mousemove', handleMouseMove);
isMouseOverElem = true;
}
},
/**
* Handle mouseleave event. This has been added to ignore
* inputs when the mouse is not over the element.
**/
handleMouseLeave = function (evt) {
// unbind our mousemove listener only when we no longer have mouse in view
if (isMouseOverElem) {
$root.unbind('mousemove', handleMouseMove);
isMouseOverElem = false;
}
state = NONE;
},
/**
* Handle click event.
*/
handleMouseDown = function (evt) {
if (evt.preventDefault) {
evt.preventDefault();
}
evt.returnValue = false;
//var svgDoc = evt.target.ownerDocument;
//var g = getRoot(svgDoc);
var g = svgRoot;
// Pan anyway when drag is disabled and the user clicked on an element
if (evt.target.tagName === "svg" || !enableDrag) {
// Pan mode
state = PAN;
stateTf = g.getCTM().inverse();
stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
} else {
// Drag mode
state = DRAG;
stateTarget = evt.target;
stateTf = g.getCTM().inverse();
stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
}
},
/**
* Handle mouse button release event.
*/
handleMouseUp = function (evt) {
if (evt.preventDefault) {
evt.preventDefault();
}
evt.returnValue = false;
//var svgDoc = evt.target.ownerDocument;
if (state === PAN || state === DRAG) {
// Quit pan mode
state = NONE;
}
},
handleBrushMouseMove = function(evt){
if (evt.preventDefault) {
evt.preventDefault();
}
evt.returnValue = false;
var g = $brush[0],
p,
vp = document.getElementById("viewport"),
vpzoom = vp.getCTM().a,
canvasScale = g.getCTM().a;
if (state === PAN && enablePan) {
// Pan mode
p = getEventPoint(evt).matrixTransform(stateTf);
var dx = (p.x - stateOrigin.x);
var dy = (p.y - stateOrigin.y);
setCTM(g, stateTf.inverse().translate(dx, dy));
//console.log("MOVE BRUSH - dX:"+dx+" dY:"+dy);
//Update Canvas
var bdx = (g.getCTM().e * (scale * vpzoom));
var bdy = (g.getCTM().f * (scale * vpzoom));
//Update instead of delete and replace.
//maintain zoom factor
$(vp).attr("transform", "matrix("+vpzoom+",0,0,"+vpzoom+"," + -(bdx) + "," + -(bdy) + ")");
}
},
handleBrushMouseUp = function(evt){
//console.log("handleBrushMouseUp");
if (evt.preventDefault) {
evt.preventDefault();
}
evt.returnValue = false;
//var svgDoc = evt.target.ownerDocument;
if (state === PAN || state === DRAG) {
// Quit pan mode
state = NONE;
}
},
handleBrushMouseDown = function(evt){
//console.log("handleBrushMouseDown");
if (evt.preventDefault) {
evt.preventDefault();
}
evt.returnValue = false;
//var svgDoc = evt.target.ownerDocument;
//var g = getRoot(svgDoc);
var g = $brush[0];
// Pan anyway when drag is disabled and the user clicked on an element
if (evt.target.tagName === "svg" || !enableDrag) {
// Pan mode
state = PAN;
stateTf = g.getCTM().inverse();
stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
} else {
// Drag mode
state = DRAG;
stateTarget = evt.target;
stateTf = g.getCTM().inverse();
stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
}
},
handleBrushMouseEnter = function(evt){
//console.log("handleBrushMouseEnter");
// bind our mousemove listener only when we have mouse in view
if (!isMouseOverBrushElem) {
recentOffset = $root.offset();
$brush.bind('mousemove', handleBrushMouseMove);
isMouseOverBrushElem = true;
}
},
handleBrushMouseLeave = function(evt){
//console.log("handleBrushMouseLeave");
// unbind our mousemove listener only when we no longer have mouse in view
if (isMouseOverBrushElem) {
$root.unbind('mousemove', handleBrushMouseMove);
isMouseOverBrushElem = false;
}
state = NONE;
}
;
/**
* Register handlers
*/
// MODIFICATION: registers events through jQuery
$root.bind('mouseup', handleMouseUp)
.bind('mousedown', handleMouseDown)
.bind('mouseenter', handleMouseEnter)
.bind('mouseleave', handleMouseLeave);
//Handle Brush Events
$brush.bind('mouseup', handleBrushMouseUp)
.bind('mousedown', handleBrushMouseDown)
.bind('mouseenter', handleBrushMouseEnter)
.bind('mouseleave', handleBrushMouseLeave);
//if (navigator.userAgent.toLowerCase().indexOf('webkit') >= 0) {
window.addEventListener('mousewheel', handleMouseWheel, false); // Chrome/Safari/others
window.addEventListener('DOMMouseScroll', handleMouseWheel, false); // Firefox
//Add event for screen resize
window.addEventListener('resize', function () {
renderBrush();
});
//Add Keyboard handling... TODO: Bind via jQuery .bind()
window.addEventListener('keydown', function (key) {
var keycode;
if (key == null) {
keycode = event.keyCode;
} else {
keycode = key.keyCode;
switch (keycode) {
case 37:
//alert('left');
renderBrush(1, 0);
break;
case 38:
//alert('up');
renderBrush(0, 1);
break;
case 39:
//alert('right');
renderBrush(-1, 0);
break;
case 40:
//alert('down');
renderBrush(0, -1);
break;
case 73:
//alert('i - zoomIn');
zoomCanvas(window.event, 1.25);
break;
case 79:
//alert('o - zoomOut');
zoomCanvas(window.event, 0.75);
break;
}
}
});
};
/**
Enable SVG panning on an SVG element.
@param canvasId the ID of an element to use as the window canvas to display what is inside the brush area. Required.
@param brushID the ID of an element to use as the window canvas to disply what is inside the brush area. Required.
@param enablePan Boolean enable or disable panning (default enabled)
@param enableZoom Boolean enable or disable zooming (default enabled)
@param zoomScale Float zoom sensitivity, defaults to .2
@param zoomRange Float zoom range, defaults to [0.25,2] (1/4x, 2x)
**/
$.fn.svgMiniMap = function (canvasId, brushID, enablePan, enableZoom, zoomScale, zoomRange) {
enablePan = typeof enablePan !== 'undefined' ? enablePan : true;
enableZoom = typeof enableZoom !== 'undefined' ? enableZoom : true;
zoomScale = typeof zoomScale !== 'undefined' ? zoomScale : 0.25;
zoomRange = typeof zoomRange !== 'undefined' ? zoomRange : [0.5, 2];
return $.each(this, function (i, el) {
var $el = $(el),
svg,
viewport;
// only call upon elements that are SVGs and haven't already been initialized.
if ($el.is('svg') && $el.data('svgMiniMap') !== true) {
console.log("create svgMiniMap!!!");
viewport = $el.find('#' + canvasId)[0];
if (viewport) {
$el.data('svgMiniMap', true);
init($el[0], viewport, brushID, enablePan, enableZoom, zoomScale, zoomRange);
} else {
throw "Could not find viewport with id #" + canvasId;
}
}
});
};
}));