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2D变换

上一篇 / 下一篇 2007-04-04 16:55:43

<DIV STYLE="position:absolute;zoom:0.5;background:black;width:400;height:300;top:33;left:55">
<DIV ID="oDiv" STYLE=" background-color: lightblue; padding:5;width:300;height:300;">
     SOME TEXT<BR/>
     SOME TEXT<BR/>
     SOME TEXT<BR/>
     SOME TEXT<BR/>
</DIV>
</DIV>

<scrīpt>
//oObj input requires that a matrix filter be applied.
//deg input defines the requested angle of rotation.
var deg2radians = Math.PI * 2 / 360;
function MatrixFilter(obj)
{
    if(!obj.filters)return;
    //alert(obj.filters.item(0));
    var Matrix;
    for(p in obj.filters)
    {
        if(p=="DXImageTransform.Microsoft.Matrix")Matrix=obj.filters["DXImageTransform.Microsoft.Matrix"];
    }
    if(!Matrix)
    {
        obj.style.filter+="progid:DXImageTransform.Microsoft.Matrix()";
    }
    Matrix=obj.filters["DXImageTransform.Microsoft.Matrix"];
    this.equal=function(Matrix2D_x)
    {
        if(Matrix2D_x.M11)Matrix.M11 = Matrix2D_x.M11;
        if(Matrix2D_x.M12)Matrix.M12 = Matrix2D_x.M12;
        if(Matrix2D_x.M21)Matrix.M21 = Matrix2D_x.M21;
        if(Matrix2D_x.M22)Matrix.M22 = Matrix2D_x.M22;
    }

    if(arguments[1])this.equal(arguments[1]);

    this.Rotate=function(deg)
    {
        rad = deg * deg2radians;
        costheta = Math.cos(rad);
        sintheta = Math.sin(rad);
        var d=new Matrix2D(costheta,-sintheta,sintheta,costheta);
        this.equal(Matrix2D.Mul(Matrix,d));
    }
    this.RotateTo=function(deg)
    {
        rad = deg * deg2radians;
        costheta = Math.cos(rad);
        sintheta = Math.sin(rad);
        var d=new Matrix2D(costheta,-sintheta,sintheta,costheta);
        this.equal(d);
    }
    this.RotateAt=function(deg,sx,sy)
    {
        rad = deg * deg2radians;
        costheta = Math.cos(rad);
        sintheta = Math.sin(rad);
        var d=new Matrix2D(costheta,-sintheta,sintheta,costheta);
        var x=sx-Matrix.Dx;
        var y=sy-Matrix.Dy;
        this.MoveTo(x*costheta+y*sintheta-x,-x*sintheta+y*costheta-y);
        this.equal(Matrix2D.Mul(Matrix,d));
    }
    this.RotateToAt=function(deg,sx,sy)
    {
        rad = deg * deg2radians;
        costheta = Math.cos(rad);
        sintheta = Math.sin(rad);
        var d=new Matrix2D(costheta,-sintheta,sintheta,costheta);
        var x=sx;
        var y=sy;
        this.MoveTo(x-(x*costheta-y*sintheta),-(x*sintheta+y*costheta-x));
        this.equal(d);
    }

    this.MoveTo=function(sx,sy)
    {
        Matrix.Dx=sx;
        Matrix.Dy=sy;
    }
    this.toMatrix2D=function()
    {
        return new Matrix2D(Matrix.M11,Matrix.M12,Matrix.M21,Matrix.M22);
    }
    this.ZoomBy=function(sx,sy)
    {
        var d=new Matrix2D(sx,0,0,sy);
        this.equal(Matrix2D.Mul(Matrix,d));
    }
    this.toString=function()
    {
        return ""+Matrix.M11+" "+Matrix.M12+"\n"+Matrix.M21+" "+Matrix.M22+"\n"
    }
    //Matrix.SizingMethod='clip to original';
    //this.fnSetRotation(30);
    //alert(Matrix.M11);
    //alert(obj.filters["DXImageTransform.Microsoft.Matrix"]);
}
function Matrix2D()
{
    this.M11 = arguments[0]||1;
    this.M12 = arguments[1]||0;
    this.M21 = arguments[2]||0;
    this.M22 = arguments[3]||1;
    this.Mul_Matrix2D=function(Matrix2D_b)
    {
        var r=new Matrix2D();
        r=Matrix2D.Mul(this,Matrix2D_b);
        return r;
    }
    this.toString=function()
    {
        return ""+this.M11+" "+this.M12+"\n"+this.M21+" "+this.M22+"\n"
    }
}
Matrix2D.Mul=function(Matrix2D_a,Matrix2D_b)
{
    var r=new Matrix2D();
    r.M11=Matrix2D_a.M11*Matrix2D_b.M11+Matrix2D_a.M12*Matrix2D_b.M21;
    r.M12=Matrix2D_a.M11*Matrix2D_b.M12+Matrix2D_a.M12*Matrix2D_b.M22;
    r.M21=Matrix2D_a.M21*Matrix2D_b.M11+Matrix2D_a.M22*Matrix2D_b.M21;
    r.M22=Matrix2D_a.M21*Matrix2D_b.M12+Matrix2D_a.M22*Matrix2D_b.M22;
    return r;
}

var mf=new MatrixFilter(oDiv);
var i=1;
setInterval("mf.RotateToAt(i++,150,150)",10);
//mf.MoveTo(30,70);
//mf.ZoomBy(1.5,1.5);
//mf.ZoomBy(1.5,1.5);
//alert(mf.toMatrix2D());

//alert(Matrix2D.Mul(m2d1,m2d2));
//fnSetRotation(oDiv.filters.item(0),30);
</scrīpt>

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