拉斐尔纸张缩放动画

Question

我设法做了一些破解以缩放raphael纸,因为setviewbox不适合我,这是我写的功能:

function setCTM(element, matrix) {
    var s = "matrix(" + matrix.a + "," + matrix.b + "," + matrix.c + "," + matrix.d + "," + matrix.e + "," + matrix.f + ")";

    element.setAttribute("transform", s);
}

Raphael.fn.zoomAndMove = function(coordx,coordy,zoom) {

    var svg = document.getElementsByTagName("svg")[0];

    var z = zoom;

    var g = document.getElementById("viewport1");
    var p = svg.createSVGPoint();

    p.x = coordx; 
    p.y = coordy;

    p = p.matrixTransform(g.getCTM().inverse());

    var k = svg.createSVGMatrix().scale(z).translate(-p.x, -p.y);
    setCTM(g, g.getCTM().multiply(k));
} 

其中viewport1元素定义为:

var gelem = document.createElementNS('http://www.w3.org/2000/svg', 'g');
gelem.id = 'viewport1';

paper.canvas.appendChild(gelem);
paper.canvas = gelem;

然后我可以打电话: paper.zoomAndMove(minx,miny,zoomRatio);

是否可以转换功能以使其平滑变焦？

Answer 1

对于想要平滑缩放和平移动画的任何人(像我一样)看看这里:

https://groups.google.com/forum/?fromgroups#!topic/raphaeljs/7eA9xq4enDo

这个剪辑帮助我自动化和动画缩放和平移到画布上的特定点.(威尔摩根的道具)

Raphael.fn.animateViewBox = function(currentViewBox, viewX, viewY, width, height, duration, callback) {

    duration = duration || 250;

    var originals = currentViewBox, //current viewBox Data from where the animation should start
        differences = {
                x: viewX - originals.x,
                y: viewY - originals.y,
                width: width - originals.width,
                height: height - originals.height
        },
        delay = 13,
        stepsNum = Math.ceil(duration / delay),
        stepped = {
                x: differences.x / stepsNum,
                y: differences.y / stepsNum,
                width: differences.width / stepsNum,
                height: differences.height / stepsNum
        }, i,
        canvas = this;

    /**
     * Using a lambda to protect a variable with its own scope.
     * Otherwise, the variable would be incremented inside the loop, but its
     * final value would be read at run time in the future.
     */
    function timerFn(iterator) {
            return function() {
                    canvas.setViewBox(
                            originals.x + (stepped.x * iterator),
                            originals.y + (stepped.y * iterator),
                            originals.width + (stepped.width * iterator),
                            originals.height + (stepped.height * iterator)
                    );
                    // Run the callback as soon as possible, in sync with the last step
                    if(iterator == stepsNum && callback) {
                            callback(viewX, viewY, width, height);
                    }
            }
    }

    // Schedule each animation step in to the future
    // Todo: use some nice easing
    for(i = 1; i <= stepsNum; ++i) {
            setTimeout(timerFn(i), i * delay);
    }

} 

Answer 2

请参阅此JS Fiddle示例,了解如何使用jQuery和Raphael的setViewBox,它可以平滑地进行缩放和平移.我们在更复杂和更大的环境中使用完全相同的功能,即使屏幕上绘制了大量项目,它也能完美呈现并保持平滑.

基本上,不要试图重新发明轮子.我知道这可能不是你想要的答案,但它几乎肯定是你最好的选择.

编辑:我已修复附加小提琴(由于JSFiddle对网站所做的更改而被破坏)但显然SO不会让我保存JSFiddle链接而不包含一些代码,所以...

console.log("hello world!");