我写了一段代码。它将屏幕上的点击点结合起来。
HTML
<button id="end">End</button>
<button id="zoomIn">Zoom-In</button>
<button id="zoomOut">Zoom-Out</button>
<canvas id="c" width="500" height="500" ></canvas>
JavaScript
var canvas = new fabric.Canvas('c');
var point1;
var line=null;
var canvasScale = 1;
var SCALE_FACTOR = 1.2;
var bool = true;
canvas.on('mouse:down', function (options) {
var x = options.e.clientX - canvas._offset.left;
var y = options.e.clientY - canvas._offset.top;
var circle = new fabric.Circle({
left: x,
top: y,
fill: 'red',
originX: 'center',
originY: 'center',
hasControls: false,
hasBorders: false,
lockMovementX: false,
lockMovementY: false,
radius: 5,
hoverCursor: 'default'
});
if(bool)
canvas.add(circle);
point1 = new fabric.Point(x, y);
if(line){
line = new fabric.Line([line.get('x2'), line.get('y2'), x, y], {
stroke: 'black',
hasControls: false,
hasBorders: false,
lockMovementX: false,
lockMovementY: false,
hoverCursor: 'default'
});
}else{
line = new fabric.Line([x, y, x, y], {
stroke: 'black',
hasControls: false,
hasBorders: false,
lockMovementX: false,
lockMovementY: false,
hoverCursor: 'default'
});
}
if(bool)
canvas.add(line);
$("#end").click(function(){
var lines = canvas.getObjects('line');
var firstLine = lines[1];
var lastLine = lines[lines.length - 1];
line = new fabric.Line([firstLine.get('x2'), firstLine.get('y2'), lastLine.get('x2'), lastLine.get('y2')], {
stroke: 'red',
hasControls: false,
hasBorders: false,
lockMovementX: false,
lockMovementY: false,
hoverCursor: 'default'
});
canvas.add(line);
bool = false;
});
});
$("#zoomIn").click(function() {
canvasScale = canvasScale * SCALE_FACTOR;
canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);
var objects = canvas.getObjects();
for (var i in objects) {
var scaleX = objects[i].scaleX;
var scaleY = objects[i].scaleY;
var left = objects[i].left;
var top = objects[i].top;
var tempScaleX = scaleX * SCALE_FACTOR;
var tempScaleY = scaleY * SCALE_FACTOR;
var tempLeft = left * SCALE_FACTOR;
var tempTop = top * SCALE_FACTOR;
objects[i].scaleX = tempScaleX;
objects[i].scaleY = tempScaleY;
objects[i].left = tempLeft;
objects[i].top = tempTop;
objects[i].setCoords();
}
canvas.renderAll();
});
$("#zoomOut").click(function() {
canvasScale = canvasScale / SCALE_FACTOR;
canvas.setHeight(canvas.getHeight() * (1 / SCALE_FACTOR));
canvas.setWidth(canvas.getWidth() * (1 / SCALE_FACTOR));
var objects = canvas.getObjects();
for (var i in objects) {
var scaleX = objects[i].scaleX;
var scaleY = objects[i].scaleY;
var left = objects[i].left;
var top = objects[i].top;
var tempScaleX = scaleX * (1 / SCALE_FACTOR);
var tempScaleY = scaleY * (1 / SCALE_FACTOR);
var tempLeft = left * (1 / SCALE_FACTOR);
var tempTop = top * (1 / SCALE_FACTOR);
objects[i].scaleX = tempScaleX;
objects[i].scaleY = tempScaleY;
objects[i].left = tempLeft;
objects[i].top = tempTop;
objects[i].setCoords();
}
canvas.renderAll();
});
但是这里有些固定的要点。
我希望在这里像这样:
HTML
<canvas id="c" width="500" height="500" ></canvas>
JavaScript
(function() {
var canvas = this.__canvas = new fabric.Canvas('c', { selection: false });
fabric.Object.prototype.originX = fabric.Object.prototype.originY = 'center';
function makeCircle(left, top, line1, line2, line3, line4) {
var c = new fabric.Circle({
left: left,
top: top,
strokeWidth: 5,
radius: 12,
fill: '#fff',
stroke: '#666'
});
c.hasControls = c.hasBorders = false;
c.line1 = line1;
c.line2 = line2;
c.line3 = line3;
c.line4 = line4;
return c;
}
function makeLine(coords) {
return new fabric.Line(coords, {
fill: 'red',
stroke: 'red',
strokeWidth: 5,
selectable: false
});
}
var line = makeLine([ 250, 125, 250, 175 ]),
line2 = makeLine([ 250, 175, 250, 250 ]),
line3 = makeLine([ 250, 250, 300, 350]),
line4 = makeLine([ 250, 250, 200, 350]),
line5 = makeLine([ 250, 175, 175, 225 ]),
line6 = makeLine([ 250, 175, 325, 225 ]);
canvas.add(line, line2, line3, line4, line5, line6);
canvas.add(
makeCircle(line.get('x1'), line.get('y1'), null, line),
makeCircle(line.get('x2'), line.get('y2'), line, line2, line5, line6),
makeCircle(line2.get('x2'), line2.get('y2'), line2, line3, line4),
makeCircle(line3.get('x2'), line3.get('y2'), line3),
makeCircle(line4.get('x2'), line4.get('y2'), line4),
makeCircle(line5.get('x2'), line5.get('y2'), line5),
makeCircle(line6.get('x2'), line6.get('y2'), line6)
);
canvas.on('object:moving', function(e) {
var p = e.target;
p.line1 && p.line1.set({ 'x2': p.left, 'y2': p.top });
p.line2 && p.line2.set({ 'x1': p.left, 'y1': p.top });
p.line3 && p.line3.set({ 'x1': p.left, 'y1': p.top });
p.line4 && p.line4.set({ 'x1': p.left, 'y1': p.top });
canvas.renderAll();
});
})();
我应该移动的点能够添加点。因此,我添加点必须与线条一起操作。
如何在上面的代码中集成它?
缩放问题 jsFiddle 示例:如果进行缩放,我的线条会变得不完整。