flash课件中常用画图函数总结.doc

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 Mtotype.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 Mtotype.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 Mtotype.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 Mtotype.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 Mtotype.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 Mtotype.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 (wav