AutoJs源码-贝塞尔曲线(4)

/* 软件作者：https://xuhss.com/oxox/pro */ "auto"; /* cp在此是四個元素的陣列: cp[0]為起始點，或上圖中的P0 cp[1]為第一個控制點，或上圖中的P1 cp[2]為第二個控制點，或上圖中的P2 cp[3]為結束點，或上圖中的P3 t為參數值，0 <= t <= 1 */ function PointOnCubicBezier( cp, t ) { var ax, bx, cx; var ay, by, cy; var tSquared, tCubed; var result ,result_x,result_y; /*計算多項式係數*/ cx = 3.0 * (cp[1].x - cp[0].x); bx = 3.0 * (cp[2].x - cp[1].x) - cx; ax = cp[3].x - cp[0].x - cx - bx; cy = 3.0 * (cp[1].y - cp[0].y); by = 3.0 * (cp[2].y - cp[1].y) - cy; ay = cp[3].y - cp[0].y - cy - by; /*計算位於參數值t的曲線點*/ tSquared = t * t; tCubed = tSquared * t; result_x = (ax * tCubed) + (bx * tSquared) + (cx * t) + cp[0].x; result_y = (ay * tCubed) + (by * tSquared) + (cy * t) + cp[0].y; result={x:result_x,y:result_y}; return result; } /* ComputeBezier以控制點cp所產生的曲線點，填入Point2D結構的陣列。 呼叫者必須分配足夠的記憶體以供輸出結果，其為<sizeof(Point2D) numberOfPoints> */ function ComputeBezier( cp, numberOfPoints, curve ) { var dt; var i; dt = 1.0 / ( numberOfPoints - 1 ); for( i = 0; i < numberOfPoints; i++) curve[i] = PointOnCubicBezier( cp, i*dt ); } var cp=[ {x:194, y:405}, {x:735, y:876}, {x:537, y:1383}, {x:846, y:1666} ]; var numberOfPoints=100; var curve=[]; ComputeBezier( cp, numberOfPoints, curve );//列表 对象 var i=0; var ra = new RootAutomator(); //让"手指1"点击位置(100, 100) ra.touchDown(194, 405); //让"手指2"点击位置(200, 200); setInterval(function (){ var j = (i<100)?i:(199-i); xx=curve[j].x yy=Math.abs(100-curve[j].y) log(xx,yy) ra.touchMove(xx,yy); if(++i==200)i=0; }, 10);