我将对画布fabric_JS上从点1到点2然后从点2到点3的线条进行动画处理。到目前为止,我已经设法在画布上绘制并显示了点,但是我缺少线描动画的一部分。 这是片段
const canvas = new fabric.Canvas('gameCanvas', {selection: false});
let circle1, circle2, circle3;
let line1, line2;
let circles = [];
fabric.Object.prototype.originX = fabric.Object.prototype.originY = 'center';
document.addEventListener('DOMContentLoaded', function(){
drawCircles();
});
document.getElementById('animateBtn').addEventListener('click', function(){
animateLinesDrawing();
});
function makeCircle(x, y)
{
return new fabric.Circle({
left: x,
top: y,
strokeWidth: 2,
radius: 10,
fill: 'white',
stroke: '#666',
selectable: false,
hoverCursor: 'default',
hasControls: false,
hasBorders: false
});
}
function drawCircles()
{
circle1 = makeCircle(52.69, 17.77);
circle2 = makeCircle(262.69, 120.77);
circle3 = makeCircle(272.69, 232.77);
circles.push(circle1);
circles.push(circle2);
circles.push(circle3);
}
function makeLine(coords)
{
return new fabric.Line(coords, {
fill: 'red',
stroke: 'red',
strokeWidth: 2,
originX: 'right',
originY: 'center',
selectable: false,
hoverCursor: 'default'
});
}
function animateLinesDrawing()
{
line1 = makeLine([circle1.left, circle1.top, circle2.left, circle2.top]);
line2 = makeLine([circle2.left, circle2.top, circle3.left, circle3.top]);
//line1_ x1: 52.69
//line1_ y1: 17.77
//line1_ x2: 262.69
//line1_ y2: 120.77
//startPoints:[line1.x1, line1.y1]
//endPoints:[line1.x2, line1.x2]
line1.animate('x1', 262.69 , {
onChange: canvas.renderAll.bind(canvas),
duration: 1000,
});
line1.animate('y1', 120.77 , {
onChange: canvas.renderAll.bind(canvas),
duration: 1000,
});
canvas.add(line1);
addCirclesTextToCanvas();
}
function addCirclesTextToCanvas()
{
canvas.add(circle1, circle2, circle3);
//..Add text inside the 3 circles
for(let i = 0; i < circles.length; i++)
{
canvas.add(new fabric.Text((i + 1).toString(), {
left: circles[i].left,
top: circles[i].top,
fontFamily: 'Arial',
fontWeight: 'bold',
fontSize: 14,
fill: 'black',
originX: 'center',
originY: 'center'
}));
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.0.0/fabric.min.js"></script>
<canvas id="gameCanvas" width="500" height="300" style="border: 2px solid green;"></canvas>
<button id="animateBtn">Animate Lines Drawing</button>
正如您在输出中看到的那样,我得到的动画不是我想要的。任何帮助将不胜感激。
答案 0 :(得分:1)
在动画方法中,更改x2,y2的值,而nargs='?'
回调在第二行做相同的操作。
演示
onComplete
const canvas = new fabric.Canvas('gameCanvas', {
selection: false
});
let circle1, circle2, circle3;
let line1, line2;
let circles = [];
fabric.Object.prototype.originX = fabric.Object.prototype.originY = 'center';
document.addEventListener('DOMContentLoaded', function() {
drawCircles();
});
document.getElementById('animateBtn').addEventListener('click', function() {
animateLinesDrawing();
});
function makeCircle(x, y) {
return new fabric.Circle({
left: x,
top: y,
strokeWidth: 2,
radius: 10,
fill: 'white',
stroke: '#666',
selectable: false,
hoverCursor: 'default',
hasControls: false,
hasBorders: false
});
}
function drawCircles() {
circle1 = makeCircle(52.69, 17.77);
circle2 = makeCircle(262.69, 120.77);
circle3 = makeCircle(272.69, 232.77);
line1 = makeLine([circle1.left, circle1.top, circle1.left, circle1.top]);
line2 = makeLine([circle2.left, circle2.top, circle2.left, circle2.top]);
canvas.add(line1,line2);
circles.push(circle1);
circles.push(circle2);
circles.push(circle3);
}
function makeLine(coords) {
return new fabric.Line(coords, {
fill: 'red',
stroke: 'red',
strokeWidth: 2,
originX: 'right',
originY: 'center',
selectable: false,
hoverCursor: 'default'
});
}
function animateLinesDrawing() {
line1.set({x1:circle1.left, y1:circle1.top, x2:circle1.left, y2:circle1.top});
line2.set({x1:circle2.left, y1:circle2.top, x2:circle2.left, y2:circle2.top});
line1.animate({
x2: circle2.left,
y2: circle2.top
}, {
onChange: canvas.requestRenderAll.bind(canvas),
onComplete: function() {
line1.setCoords();
line2.animate({
x2: circle3.left,
y2: circle3.top
}, {
onChange: canvas.requestRenderAll.bind(canvas),
onComplete: line2.setCoords.bind(line2),
duration: 1000
});
},
duration: 1000
});
addCirclesTextToCanvas();
}
function addCirclesTextToCanvas() {
canvas.add(circle1, circle2, circle3);
//..Add text inside the 3 circles
for (let i = 0; i < circles.length; i++) {
canvas.add(new fabric.Text((i + 1).toString(), {
left: circles[i].left,
top: circles[i].top,
fontFamily: 'Arial',
fontWeight: 'bold',
fontSize: 14,
fill: 'black',
originX: 'center',
originY: 'center',
selectable: false
}));
}
}