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Android 以3d方式设置位图动画_Android_Animation_Canvas_3d_Bitmap - Fatal编程技术网

Android 以3d方式设置位图动画

Android 以3d方式设置位图动画,android,animation,canvas,3d,bitmap,Android,Animation,Canvas,3d,Bitmap,我正在视图类中使用画布绘制一些位图。用户滑动以更改位图。我想通过以下方式设置位图之间切换的动画: 有什么帮助吗?这是一个旋转的三维立方体的二维模拟。 希望我能说是我自己做的,但我最初在这里得到了代码: 下面是代码和小提琴: HTML5实验:旋转立体立方体 window.onload=startDemo; 功能点3D(x、y、z){ 这个.x=x; 这个。y=y; 这个。z=z; this.rotateX=函数(角度){ var rad、cosa、新浪、y、z rad=角度*Math.PI

我正在视图类中使用画布绘制一些位图。用户滑动以更改位图。我想通过以下方式设置位图之间切换的动画:


有什么帮助吗?

这是一个旋转的三维立方体的二维模拟。

希望我能说是我自己做的,但我最初在这里得到了代码:

下面是代码和小提琴:


HTML5实验:旋转立体立方体
window.onload=startDemo;
功能点3D(x、y、z){
这个.x=x;
这个。y=y;
这个。z=z;
this.rotateX=函数(角度){
var rad、cosa、新浪、y、z
rad=角度*Math.PI/180
cosa=Math.cos(rad)
sina=Math.sin(rad)
y=this.y*cosa-this.z*sina
z=这个.y*sina+这个.z*cosa
返回新的Point3D(此.x,y,z)
}
this.rotateY=函数(角度){
var rad、cosa、新浪、x、z
rad=角度*Math.PI/180
cosa=Math.cos(rad)
sina=Math.sin(rad)
z=这个.z*cosa-这个.x*sina
x=这个.z*sina+这个.x*cosa
返回新的点3D(x,this.y,z)
}
this.rotateZ=函数(角度){
var rad、cosa、新浪、x、y
rad=角度*Math.PI/180
cosa=Math.cos(rad)
sina=Math.sin(rad)
x=这个.x*cosa-这个.y*sina
y=这个.x*sina+这个.y*cosa
返回新的Point3D(x,y,this.z)
}
this.project=函数(viewWidth、viewHeight、fov、viewDistance){
var因子,x,y
系数=视野/(视距+此.z)
x=此.x*系数+视图宽度/2
y=此.y*系数+视图高度/2
返回新的Point3D(x,y,this.z)
}
}
变量顶点=[
新的Point3D(-1,1,-1),
新的Point3D(1,1,-1),
新的Point3D(1,-1,-1),
新的Point3D(-1,-1,-1),
新的Point3D(-1,1,1),
新的Point3D(1,1,1),
新的Point3D(1,-1,1),
新的Point3D(-1,-1,1)
];
//定义构成6个面中每个面的顶点。这些数字是
//指向上面定义的顶点列表的索引。
var faces=[[0,1,2,3]、[1,5,6,2]、[5,4,7,6]、[4,0,3,7]、[0,4,5,1]、[3,2,6,7];
//定义每个面的颜色。
变量颜色=[[255,0,0],[0255,0],[0,0255],[255255,0],[0255255],[255,0255];
var角=0;
/*从3个元素的数组构造CSS RGB值*/
函数arrayToRGB(arr){
如果(arr.length==3){
返回“rgb”(“+arr[0]+”、“+arr[1]+”、“+arr[2]+”);
}
返回“rgb(0,0,0)”;
}
函数startDemo(){
canvas=document.getElementById(“thecanvas”);
if(canvas&&canvas.getContext){
ctx=canvas.getContext(“2d”);
设置间隔(循环,33);
}
}
函数循环(){
var t=新数组();
ctx.fillStyle=“rgb(0,0,0)”;
ctx.fillRect(0,0400250);
对于(var i=0;i
<!DOCTYPE html>
<html>
<head>
    <title>HTML5 Experiment: A Rotating Solid Cube</title>
    <script type="text/javascript">
        window.onload = startDemo;

        function Point3D(x,y,z) {
            this.x = x;
            this.y = y;
            this.z = z;

            this.rotateX = function(angle) {
                var rad, cosa, sina, y, z
                rad = angle * Math.PI / 180
                cosa = Math.cos(rad)
                sina = Math.sin(rad)
                y = this.y * cosa - this.z * sina
                z = this.y * sina + this.z * cosa
                return new Point3D(this.x, y, z)
            }

            this.rotateY = function(angle) {
                var rad, cosa, sina, x, z
                rad = angle * Math.PI / 180
                cosa = Math.cos(rad)
                sina = Math.sin(rad)
                z = this.z * cosa - this.x * sina
                x = this.z * sina + this.x * cosa
                return new Point3D(x,this.y, z)
            }

            this.rotateZ = function(angle) {
                var rad, cosa, sina, x, y
                rad = angle * Math.PI / 180
                cosa = Math.cos(rad)
                sina = Math.sin(rad)
                x = this.x * cosa - this.y * sina
                y = this.x * sina + this.y * cosa
                return new Point3D(x, y, this.z)
            }

            this.project = function(viewWidth, viewHeight, fov, viewDistance) {
                var factor, x, y
                factor = fov / (viewDistance + this.z)
                x = this.x * factor + viewWidth / 2
                y = this.y * factor + viewHeight / 2
                return new Point3D(x, y, this.z)
            }
        }

        var vertices = [
            new Point3D(-1,1,-1),
            new Point3D(1,1,-1),
            new Point3D(1,-1,-1),
            new Point3D(-1,-1,-1),
            new Point3D(-1,1,1),
            new Point3D(1,1,1),
            new Point3D(1,-1,1),
            new Point3D(-1,-1,1)
        ];

        // Define the vertices that compose each of the 6 faces. These numbers are
        // indices to the vertex list defined above.
        var faces  = [[0,1,2,3],[1,5,6,2],[5,4,7,6],[4,0,3,7],[0,4,5,1],[3,2,6,7]];

        // Define the colors for each face.
        var colors = [[255,0,0],[0,255,0],[0,0,255],[255,255,0],[0,255,255],[255,0,255]];

        var angle = 0;

        /* Constructs a CSS RGB value from an array of 3 elements. */
        function arrayToRGB(arr) {
            if( arr.length == 3 ) {
                return "rgb(" + arr[0] + "," + arr[1] + "," + arr[2] + ")";
            }
            return "rgb(0,0,0)";
        }

        function startDemo() {
            canvas = document.getElementById("thecanvas");
            if( canvas && canvas.getContext ) {
                ctx = canvas.getContext("2d");
                setInterval(loop,33);
            }
        }

        function loop() {
            var t = new Array();

            ctx.fillStyle = "rgb(0,0,0)";
            ctx.fillRect(0,0,400,250);

            for( var i = 0; i < vertices.length; i++ ) {
                var v = vertices[i];
                var r = v.rotateX(angle).rotateY(angle);
                var p = r.project(400,250,200,4);
                t.push(p)
            }

            var avg_z = new Array();

            for( var i = 0; i < faces.length; i++ ) {
                var f = faces[i];
                avg_z[i] = {"index":i, "z":(t[f[0]].z + t[f[1]].z + t[f[2]].z + t[f[3]].z) / 4.0};
            }

            avg_z.sort(function(a,b) {
                return b.z - a.z;
            });

            for( var i = 0; i < faces.length; i++ ) {
                var f = faces[avg_z[i].index]

                ctx.fillStyle = arrayToRGB(colors[avg_z[i].index]);
                ctx.beginPath()
                ctx.moveTo(t[f[0]].x,t[f[0]].y)
                ctx.lineTo(t[f[1]].x,t[f[1]].y)
                ctx.lineTo(t[f[2]].x,t[f[2]].y)
                ctx.lineTo(t[f[3]].x,t[f[3]].y)
                ctx.closePath()
                ctx.fill()
            }
            angle += 2
        }
    </script>
</head>
<body>
        <canvas id="thecanvas" width="400" height="250">
        Your browser does not support the HTML5 canvas element. <a href=#>Click here</a> to watch the video.
    </canvas>

    </body>
</html>