AutoJs源码-研究矩阵

/* 软件作者：https://xuhss.com/oxox/pro */ importPackage(android.graphics); log(new Canvas()); var matrix= new Matrix(); log(matrix); matrix.setTranslate(100,100); //矩阵坐标移动(x偏移,y偏移) log(matrix); matrix.postScale(0.5,0.5); //矩阵缩放(sx,sy,x…,y…); log(matrix); matrix.postRotate(30); //矩阵旋转(Y,x…,y…) log(matrix); matrix.postSkew(1,2); //错切(x,y,x…,y…) log(matrix); log(matrix.toShortString()); //{name:"getValues",type:"function",string:"function getValues() {/*void getValues(float[])*/}"} //var buffer = java.lang.reflect.Array.newInstance( java.lang.Float.TYPE, 3); var ary=util.java.array("float", 8); // var ary=[1.0,0.0,0.0,0.0,1.0,0.0,0.0,0.0,1.0]; matrix.mapPoints(ary,ary); log(ary); /* {name: "mapPoints", type: "function", string: "function mapPoints() { void mapPoints(float[],float[]) void mapPoints(float[],int,float[],int,int) void mapPoints(float[]) } "} */ /* Matrix matrix1 = new Matrix(); Matrix matrix2 = new Matrix(); matrix1.setTranslate(1,2); matrix2.setTranslate(2,2); // 输出：matrix1 == matrix2:false System.out.println("matrix1 == matrix2:" + matrix1.equals(matrix2)); */ /*Matrix matrix = new Matrix(); // 输出：+号相连：Matrix{[1.0, 0.0, 0.0][0.0, 1.0, 0.0][0.0, 0.0, 1.0]} System.out.println("+号相连：" + matrix); // 输出：Matrix{[1.0, 0.0, 0.0][0.0, 1.0, 0.0][0.0, 0.0, 1.0]} System.out.println("toString：" + matrix.toString()); // 输出：[1.0, 0.0, 0.0][0.0, 1.0, 0.0][0.0, 0.0, 1.0] System.out.println("toShortString：" + matrix.toShortString()); */ /* public static final int MSCALE_X = 0; //!< use with getValues/setValues public static final int MSKEW_X = 1; //!< use with getValues/setValues public static final int MTRANS_X = 2; //!< use with getValues/setValues public static final int MSKEW_Y = 3; //!< use with getValues/setValues public static final int MSCALE_Y = 4; //!< use with getValues/setValues public static final int MTRANS_Y = 5; //!< use with getValues/setValues public static final int MPERSP_0 = 6; //!< use with getValues/setValues public static final int MPERSP_1 = 7; //!< use with getValues/setValues public static final int MPERSP_2 = 8; //!< use with getValues/setValues 方法示例： Matrix matrix = new Matrix(); // matrix = [1.0, 0.0, 0.0][0.0, 1.0, 0.0][0.0, 0.0, 1.0] System.out.println("matrix = " + matrix.toShortString()); float[] values = new float[9]; matrix.getValues(values); // matrix转换成数组后 = [1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0] System.out.println("matrix转换成数组后 = " + Arrays.toString(values)); // 为matrix赋值 values [Matrix.MTRANS_X] = 2; values [Matrix.MTRANS_Y] = 3; matrix.setValues(values); // matrix = [1.0, 0.0, 2.0][0.0, 1.0, 3.0][0.0, 0.0, 1.0] System.out.println("matrix = " + matrix.toShortString()); */ /* // [1.0, 0.0, 0.0] // [0.0, 1.0, 0.0] // [0.0, 0.0, 1.0] Matrix matrix = new Matrix(); Matrix matrix1 = new Matrix(); Matrix matrix2 = new Matrix(); // [1.0, 0.0, 0.0] [2.0, 3.0, 4.0] // [0.0, 1.0, 0.0] -> [2.0, 0.0, 0.0] // [0.0, 0.0, 1.0] [1.0, 1.0, 1.0] matrix1.setValues(new float[]{2.0f,3.0f, 4.0f, 2.0f,0.0f, 0.0f, 1.0f,1.0f,1.0f}); // [1.0, 0.0, 0.0] [2.0, 5.0, 4.0] // [0.0, 1.0, 0.0] -> [3.0, 0.0, 0.0] // [0.0, 0.0, 1.0] [1.0, 2.0, 1.0] matrix2.setValues(new float[]{2.0f,5.0f, 4.0f, 3.0f,0.0f, 0.0f, 1.0f,2.0f,1.0f}); // [2.0, 3.0, 4.0] [2.0, 5.0, 4.0] [17.0, 18.0, 12.0] // [2.0, 2.0, 0.0](matrix1) * [3.0, 0.0, 0.0](matrix2) = [4.0, 10.0, 8.0 ] (matrix) // [1.0, 1.0, 1.0] [1.0, 2.0, 1.0] [6.0, 7.0, 5.0 ] matrix.setConcat(matrix1,matrix2); */ /* //距离 // 一个半径为100.0f的圆，放大1倍后，半径也将增大一倍。据说用在画布中的圆随画布大小变化时 float radius = 100.0f; float radiusAfterMatrix; Matrix matrixRadius = new Matrix(); matrixRadius.setScale(2,2); radiusAfterMatrix = matrixRadius.mapRadius(radius); // 输出：radius=200.0 System.out.println("radius=" + radiusAfterMatrix); */ /* // ======================= // mapPoints(float[] pts) // ======================= // 运算后的结果会保存在pts数组中，原pts数组中的内容会被覆盖 // 1.《点的移动》,对于任意点(Xn,Yn),x轴方向平移dx,y轴方向平移dy后有： // Xn = Xn + dx // Yn = Yn + dy float[] ptsTrans = {6,2}; Matrix matrixTrans = new Matrix(); matrixTrans.setTranslate(-2,2); matrixTrans.mapPoints(ptsTrans); // 输出：trans=[4.0, 4.0] System.out.println("trans=" + Arrays.toString(ptsTrans)); // 2.《点的放大》，对于任意点(Xn,Yn),绕点(px,py)x轴、y轴方向分别放大sx倍、sy倍后，有： // Xn = Xn * sx + (px - px * sx) // Yn = Yn * sy + (py - sy * py) float[] ptsScale = {2,3}; Matrix matrixScale = new Matrix(); matrixScale.setScale(3,6,2,2); matrixScale.mapPoints(ptsScale); // 输出：scale=[2.0, 8.0] System.out.println("scale=" + Arrays.toString(ptsScale)); // 3.《点的旋转》，对于任意点(Xn,Yn),绕点(px,py)旋转a度后，有： // Xn = (Xn - px) * cos(a) - (Yn - py) * sin(a) + px // Yn = (Xn - px) * sin(a) + (Yn - py) * cos(a) + py float[] ptsRotate = {6,6}; Matrix matrixRotate = new Matrix(); matrixRotate.preRotate(90,2,3); matrixRotate.mapPoints(ptsRotate); // 输出：rotate=[-1.0,7.0] System.out.println("rotate=" + Arrays.toString(ptsRotate)); // 4.《点的错切》,对于任意点(Xn,Yn),绕点(px,py)x轴、y轴方向分别错切kx、ky后，有： // Xn = Xn + kx(Yn - py) // Yn = Yn + ky(Xn - px) float[] ptsSkew = {3,2}; Matrix matrixSkew = new Matrix(); matrixSkew.setSkew(2,3,6,8); matrixSkew.mapPoints(ptsSkew); // 输出：skew=[-9.0,-7.0] System.out.println("skew=" + Arrays.toString(ptsSkew)); // =================================== // mapPoints(float[] dst, float[] src) // =================================== // 运算后的结果保存在dst数组中，原src数组中的内容会保留 float[] src = {2,3,3,3}; float[] dst = new float[src.length]; Matrix matrixDstSrc = new Matrix(); matrixDstSrc.setTranslate(2,3); matrixDstSrc.mapPoints(dst,src); // 输出：dst=[4.0,6.0,5.0,6.0] System.out.println("dst=" + Arrays.toString(dst)); // 输出：src=[2.0,3.0,3.0,3.0] System.out.println("src=" + Arrays.toString(src)); // ============================================================================== // mapPoints(float[] dst, ---- 计算结果存放数组 // int dstIndex, ---- dst数组存放计算结果时起始下标 // float[] src, ---- 计算的源数组 // int srcIndex, ---- 源数组计算时起始下标 // int pointCount ---- 从起始下标开始一共要计算多少个点 // ) // ============================================================================== // 运算后的结果保存在dst数组中 float[] src1 = {2,3,3,3,2,3}; float[] dst1 = new float[]{6,6,6,6,6,6}; Matrix matrixDstSrc1 = new Matrix(); matrixDstSrc1.setTranslate(1,1); // 1）从src1下标为2的位置开始计算，计�