前一段参与了一个2D机房的项目，但是这种“命题作文”总感觉憋屈，那就回咱这主场再发挥发挥！
第一篇，咱就从机柜下手。
……机柜似乎有点太简单了，因为
机柜就是个大灰框
drawBorder: function(ctx) {
ctx.fillStyle = 'gray';
ctx.fillRect(
this._rackX,
this._rackY,
this._rackOuterWidth,
this._rackOuterHeight);
ctx.clearRect(
this._rackX + this._rackGapLR + this._rackInnerGapLR,
this._rackY + this._rackGapTB + this._rackInnerGapTB,
this._rackInnerWidth,
this._rackInnerHeight);
},
当然我不可能到此为止啊，起码给大灰框加点过渡色吧：
this._gradient = this._ctx.createLinearGradient(
this._rackX,
this._rackY,
this._rackX + this._rackOuterWidth,
this._rackY);
this._gradient.addColorStop(0, '#888888');
this._gradient.addColorStop(0.05, '#555555');
this._gradient.addColorStop(0.2, '#999999');
this._gradient.addColorStop(0.5, '#333333');
this._gradient.addColorStop(0.8, '#999999');
this._gradient.addColorStop(0.95, '#555555');
this._gradient.addColorStop(1, '#888888');
机柜要有U位
drawUspace: function(ctx) {
ctx.lineWidth = 0.5;
var uCount = this._uCount;
while(uCount--) {
ctx.strokeStyle = this._lineColor;
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(
this._rackX + this._rackGapLR,
this._rackY + this._rackGapTB + this._uHeight * uCount)
ctx.lineTo(
this._rackX + this._rackGapLR + this._uWidth,
this._rackY + this._rackGapTB + this._uHeight * uCount)
ctx.stroke();
}
ctx.lineWidth = this._lineWidth;
ctx.strokeStyle = this._lineColor;
ctx.strokeRect(
this._rackX + this._rackGapLR,
this._rackY + this._rackGapTB,
this._uWidth,
this._uHeight * this._uCount);
},
U位要有编号
if(this._element._showUscale) {
ctx.textAlign = 'right';
ctx.fillText(
this._uCount - uCount,
this._rackX - 2,
this._rackY + this._rackGapTB + this._uHeight * uCount + this._uHeight / 2);
ctx.textAlign = 'left';
ctx.fillText(
this._uCount - uCount,
this._rackX + this._rackOuterWidth + 2,
this._rackY + this._rackGapTB + this._uHeight * uCount + this._uHeight / 2);
}
再加点小细节
drawGarnish: function(ctx) {
var signCount = this._uCount * 3;
while(signCount--) {
ctx.fillStyle = '#333333';
ctx.fillRect(
this._rackX + this._rackGapLR - this._uHeight / 2,
this._rackY + this._rackGapTB + 0.5 + this._uHeight / 3 * signCount,
this._uHeight / 3 - 1,
this._uHeight / 3 - 1);
ctx.fillRect(
this._rackX + this._rackGapLR + this._uWidth + this._uHeight / 6 + 1,
this._rackY + this._rackGapTB + 0.5 + this._uHeight / 3 * signCount,
this._uHeight / 3 - 1,
this._uHeight / 3 - 1);
ctx.beginPath();
ctx.strokeStyle = '#FFFFFF';
ctx.lineWidth = 1;
ctx.moveTo(
this._rackX + this._rackGapLR + 2,
this._rackY + this._rackGapTB + ((this._uHeight / 3 - 1) / 2 + 0.5) + this._uHeight / 3 * signCount)
ctx.lineTo(
this._rackX + this._rackGapLR + this._uWidth - 2,
this._rackY + this._rackGapTB + ((this._uHeight / 3 - 1) / 2 + 0.5) + this._uHeight / 3 * signCount)
ctx.stroke();
}
},
交互式细节
添加了细节虽然逼真了一些，但也会多消耗资源，还显得有点乱，尤其是多个机柜同时展示的时候。
能不能只有我关注的机柜才显示细节，而不关注的就清清爽爽的呢？当然可以，比如我们就把鼠标移入作为“关注”，鼠标移出就“不关注”：
this.getView().addEventListener('mousemove', function(e) {
var elements = self.getElementsAt(e) && self.getElementsAt(e)._as;
var currentRack = getCurrentRack();
if(currentRack) {
if(currentRack != self._currentRack) {
self._currentRack && self._currentRack.onMouseLeave(e);
currentRack.onMouseEnter(e);
self._currentRack = currentRack;
}
} else if (self._currentRack) {
self._currentRack.onMouseLeave(e);
self._currentRack = null;
}
function getCurrentRack() {
if(elements && elements.length) {
for(var i = 0; i < elements.length; i++) {
elements[i].onMouseMove(e);
if(elements[i] instanceof RackBin) {
return elements[i];
}
}
return null;
}
return null;
}
}, this);
onMouseEnter: function(e) {
this._showUscale = true;
this._showGarnish = true;
this._network.invalidateElementUIs();
},
onMouseLeave: function(e) {
this._showUscale = false;
this._showGarnish = false;
this._network.invalidateElementUIs();
},
交互式U位
如果鼠标在机柜上移动，移到不同的U位就突出显示一下当前U位，那必然是极好的。说干就干：
onMouseMove: function(e) {
var eLoc = this._network.zoomManager._getLogicalPoint(e);
this.setFocusUnum(eLoc);
},
setFocusUnum: function(x, y) {
if(x && (x.x || x.y || x.x == 0 || x.y == 0)) {
y = x.y;
x = x.x;
}
this._UI._focusUnum = this.getUnum(x, y);
this._UI.checkRackUAttachment();
},
checkAttachments: function() {
RackBinUI.superClass.checkAttachments.call(this);
this.checkRackUAttachment();
},
checkRackUAttachment: function() {
if(this._focusUnum) {
var data = this._rackUdatas[this._focusUnum];
if(data) {
if(this._rackUAttachment) {
if(this._rackUAttachment._id != data.id) {
this._rackUAttachment.setData(data);
this._network.invalidateElementUI(this._element, true);
}
} else {
this._rackUAttachment = new RackUAttachment(this, true, data);
this.addAttachment(this._rackUAttachment);
this._network.invalidateElementUI(this._element, true);
}
}
} else {
if(this._rackUAttachment) {
this.removeAttachment(this._rackUAttachment, true);
this._rackUAttachment = null;
}
}
}
这里的“当前U位”使用了自定义附件的方式，至于为什么用这种方式……大概就是我会的太多了吧^-^
对了，我之前提到过什么来着——
多机柜展示
arrangeRacks: function() {
var count = this._racks.length;
if(count) {
var spacing = this._rackWidth + 40;
var viewRect = this.getViewRect();
var startX = viewRect.x + viewRect.width / 2 - this._rackWidth / 2;
if(count > 1) {
startX -= spacing * (count - 1) / 2;
}
if(startX < viewRect.x) {
startX = viewRect.x + 20;
}
for(var i = 0; i < this._racks.length; i++) {
var x = startX + spacing * i;
var y = viewRect.y + viewRect.height / 2 + this._rackHeight / 2 - this._racks[i].getHeight();
if(y < viewRect.y) {
y = viewRect.y + 10;
}
this._racks[i].setLocation(x, y);
}
}
},
这样的机柜，可还入您的法眼？