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(var I = 0; I Context. beginPath ();If (I % 3 ){Context. lineWidth = 3;Context. strokeStyle = "gray ";Len = 5;} Else {Context. lineWidth = 6;Context. strokeStyle = "# ff0 ";Len = 10;}Arc = I/6 * Math. PI;Kx = centerX + radius * Math. cos (arc );Ky = centerY-radius * Math. sin (arc );Context. moveTo (kx, ky );Kx = centerX + (radius-len) * Math. cos (arc );Ky = ce

node{int keynum; The number of key codes in the/* node, that is, the size of the node.struct Node *parent; /* Point to parent node * *KeyType key[m+1]; /* Critical code vector, No. No. 0 Unit not used/*struct Node *ptr[m+1]; /* Subtree pointer vector * *Record *recptr[m+1]; /* Record pointer vector/*}nodetype; /*b tree Node Type * *typedef struct{NodeType *pt; * * point to the Found node/int i; /* Key code number in the node, node ordinal interval [1...m]*/int tag; /* 1: Find success, 0: Find f

*/Typedef struct Node {Int keynum;/* Number of keycodes in the node, that is, the node size */Struct Node * parent;/* points to the parent Node */KeyType key [m + 1];/* key code vector. Unit 0 is not used */Struct Node * ptr [m + 1];/* subtree pointer vector */Record * recptr [m + 1];/* Record pointer vector */} NodeType;/* B tree node type */ Typedef struct {NodeType * pt;/* points to the node found */Int I;/* key code serial number in the node, node serial number range [1... M] */Int tag;/* 1

; /* The number of key codes in the node, that is, the node size */struct Node *parent; /* Point to parent node */KeyType key[m+1]; /* Key code vector, Unit No. 0 not used */struct Node *ptr[m+1]; /* Sub-tree pointer vector */Record *recptr[m+1]; /* Record pointer vector */}nodetype; /*b tree Node Type */typedef struct{NodeType *pt; /* point to the Found node */int i; /* Key code ordinal in node, node ordinal range [1...m]*/int tag; /* 1: Find successful, 0: Find failed */}result; Search result

;/* Number of keycodes in the node, that is, the node size */struct node * parent;/* points to the parent node */keytypekey [M + 1];/* key code vector, unit 0 is not used */struct node * PTR [M + 1];/* subtree pointer vector */record * recptr [M + 1]; /* record pointer vector */} nodetype;/* B tree node type */typedef struct {nodetype * PT;/* points to the found node */int I; /* key code serial number in the node, node serial number range [1... M] */INT tag;/* 1: search successful, 0: search fai

mirror and reflection effect). The px parameter, py is used to specify the center of the scaling (that is, the coordinates of the position of the point will not change after the scaling changes). The default value is (0, 0), that is, the upper left corner.Translation operation There are three translation methods in Matrix. public boolean postTranslate (float dx, float dy)public boolean preTranslate (float dx, float dy)public void setTranslate (float dx, float dy) The dx parameter, dy indicates

= 3P.Below, we use the coordinates of P, Q points (x1,y1), (X2,y2), to find the coordinates of the R=P+Q (X4,Y4).　　Example 4: to find the elliptic curve square y2+a1xy+a3y = x3+a2x2+a4x+a6, the normal point P (x1,y1), Q (X2,y2) and R (x4,y4) coordinates.　　Solution:(1) First seek point-R (X3,y3)Because the P,q,-r three-point collinear, the collinear equation is y=kx+b, in whichIf P≠q (p,q two points do not coincide) thenLinear slope k= (y1-y2)/(X1-X2)

Find-Data Structuresseveral search algorithms: sequential lookups, binary lookups, block lookups, hash listsFirst, the basic idea of sequential search:From one end of the table, to the other end by the given value of KX and the key code to compare, if found, find the success, and give the position of the data element in the table, if the entire table is detected, the same key code is still not found with the KX