flash课件中常用画图函数总结

flash课件中常用画图函数总结

课件演示时需动态过程，所以得用lineTo()实现，而不能用curveTo()画图*两点间画直线

*画螺旋线

*画正方形、圆、椭圆

*抛物线

*正弦、余弦线

使用方法：加到帧中就可

// 画直线

// / x1, y1: 起点坐标

// x2, y2: 终点坐标

// k是层次

Movieclip.prototype.drawline = function(x1, y1, x2, y2, k) {

this.linestyle(1);

this.moveTo(x1, y1);

this.lineTo(x2, y2);

};

// 从(0,0)到(100,100)画一条线

_root.createEmptyMovieClip("mc", 10);

mc.drawline(0, 0, 100, 100);

// 画螺旋线

// w、h为宽和高

// f控制线的长短，用弧度表示

Movieclip.prototype.drawhelix = function(w, h, f) {

for (var i = 0; i this.lineTo(x=Math.sin(i)*i*w, y=Math.cos(i)*i*h);

this.linestyle(1);

}

};

// 以(100,100)为中心画螺旋线

_root.createEmptyMovieClip("luo", 1);

with (luo) {

drawhelix(5, 5, 13);

_x += 100;

_y += 100;

}

// 多功能函数，可画圆，椭圆，正多边形等

// n为边数

Movieclip.prototype.drawmany = function(w, h, n) { f = 2*Math.PI;

for (var i = 0; i<=f/n*(n+1); i += f/n) {

this.lineTo(x=Math.sin(i)*w, y=Math.cos(i)*h); this.linestyle(1);

}

};

// 画一正五边形

_root.createEmptyMovieClip("duobian", 2);

with (duobian) {

drawmany(50, 50, 5);

_x += 250;

_y += 100;

// 5为多边形的边数，6.3为2pai

}

// 画一椭圆

_root.createEmptyMovieClip("tuo", 3);

with (tuo) {

drawmany(25, 50, 100);

_x += 400;

_y += 100;

}

// 圆

_root.createEmptyMovieClip("yuan", 4);

with (yuan) {

drawmany(50, 50, 100);

_x += 400;

_y += 300;

}

// 抛物线

Movieclip.prototype.drawparabola = function(l, r, k) { for (var i = -l; i<=r; i += 1) {

this.lineTo(x=i, y=k*i*i);

this.linestyle(1);

}

};

// 调用

_root.createEmptyMovieClip("parabola", 100);

with (parabola) {

drawparabola(50, 50, 0.05);

_x += 200;

_y += 200;

// 顶点坐标

}

// 正弦线,余弦类似

Movieclip.prototype.drawsin = function(n, k) {

for (var i = 0; i<=90*n; i += 1) {

this.lineTo(x=i, y=k*Math.sin(i*Math.PI/180)); this.linestyle(1);

}

};

_root.createEmptyMovieClip("sin", 101);

with (sin) {

drawsin(4, 50);

_x += 200;

_y += 200;

// 顶点坐标

}

Movieclip.prototype.drawwave = function(w, h) {

for (var i = 0; i<=6.3; i += 0.01) {

this.lineTo(x=w/Math.cos(i), y=h*Math.sin(i)/Math.cos(i));

this.linestyle(1);

}

};

_root.createEmptyMovieClip("wave", 105);

with (wave) {

drawwave(100, 100);

_x += 200;

_y += 200;

// 顶点坐标

}

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