ࡱ> 3 LbjbjOO --H]pppppppL<<<<= = = $sp= ^= = = ipp<<iii= p<p<pppp= ii3Spp<t|`Use the Geometry Calculator By entering a formula on the command line, you can quickly solve a mathematical problem or locate points in your drawing. By entering a formula on the command line, you can quickly solve a mathematical problem or locate points in your drawing. The CAL command runs the AutoCAD 3D calculator utility to evaluate vector expressions (combining points, vectors, and numbers) and real and integer expressions. The calculator performs standard mathematical functions. It also contains a set of specialized functions for calculations involving points, vectors, and AutoCAD geometry. With the CAL command, you can Calculate a vector from two points, the length of a vector, a normal vector (perpendicular to the XY plane), or a point on a line. Calculate a distance, radius, or angle. Specify a point with the pointing device. Specify the last-specified point or intersection. Use object snaps as variables in an expression. Convert points between a UCS and the WCS. Filter the X, Y, and Z components of a vector. Rotate a point around an axis. Evaluating Expressions CAL evaluates expressions according to standard mathematical rules of precedence. Operator Operation( )Groups expressions^Indicates numeric exponent*, /Multiplies and divides numbers+, -Adds and subtracts numbers Calculating Points To calculate a point You can use CAL whenever you need to calculate a point or a number within an AutoCAD command. For example, you enter (mid+cen)/2 to specify a point halfway between the midpoint of a line and the center of a circle. The following example uses CAL as a construction tool. It locates a center point for a new circle, and then calculates one fifth of the radius of an existing circle. INCLUDEPICTURE \d \z "online_art/auw0348u.gif" INCLUDEPICTURE \d \z "online_art/auw0348u.gif" Here is the command line sequence: Command: circle Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 'cal >> Expression: (mid+cen)/2 >> Select entity for MID snap: Select the notch line (1) >> Select entity for CEN snap: Select the large circle (2) Diameter/: 'cal >> Expression: 1/5*rad >> Select circle, arc or polyline segment for RAD function: Select the large circle (3) Shortcut functions  Function Shortcut for Descriptiondeedist(end,end)Distance between two endpointsille ill(end,end,end,end)Intersection of two lines defined by four endpointsmee(end+end)/2Midpoint between two endpointsneenor(end,end)Unit vector in the XY plane and normal to two endpointsveevec(end,end)Vector from two endpointsvee1 vec1(end,end)Unit vector from two endpoints Formatting Points and Vectors A point or vector is a set of three real expressions enclosed in brackets ([ ]): [r1,r2,r3] The notation p1, p2, and so forth designates points. The notation v1, v2, and so forth designates vectors. In drawings, points are displayed as dots, and vectors are displayed as lines with arrows. CAL supports points expressed in all AutoCAD formats. Point formats  Coordinate system Point formatPolar [dist: 'cal >> Expression: nor >> Select circle, arc or polyline for NOR function: INCLUDEPICTURE \d \z "online_art/acw0473u.gif" The functions vec and vec1 calculate a vector from two points. vec(p1,p2) Provides the vector from point p1 to point p2. vec1(p1,p2) Provides the unit vector from point p1 to point p2. The following example uses CAL to move selected objects three units in the direction from the center of one selected circle to the center of another selected circle: Command: move Select objects Specify base point or displacement: 'cal >> Expression: 3*vec1(cen,cen) Select entity for CEN snap: Specify a circle or an arc Specify second point of displacement or : Specify a point or press ENTER The following examples illustrate the meaning of vector and point calculations. Examples of vector and point calculations  Expression Meaningvec(a,b)Determines vector translation from point a to point b.vec1(a,b)Determines unit vector direction from point a to point b.L*vec1(a,b)Determines vector of length L in the direction from point a to point b.a+vDetermines point b, which is a translation of the point a through vector v.a+[5<20]Determines point b positioned 5 units away from point a under the angle of 20 degrees. Note that [5<20] is a vector in polar coordinates. INCLUDEPICTURE \d \z "online_art/acw0469u.gif"  The abs function calculates the length of a vector. abs(v) Calculates the length of vector v, a nonnegative real number. In spherical coordinates (dist> Expression: cen+[0,1] >> Select entity for CEN snap: Select a circle or an arc Specify next point or [Close/Undo]: 'cal >> Expression: @+3*vec1(cen,cen) The first point of the line is one unit in the Y direction from the center of the first selected circle. The second point of the line is three units away from the first point. The direction of the line is from the center of the first selected circle to the center of the second selected circle. You can use the AutoCAD Snap modes as parts of arithmetic expressions. AutoCAD prompts you to select an object and returns the coordinate of the appropriate snap point. Using arithmetic expressions with Snap modes greatly simplifies entering coordinates relative to other objects. When you use these Snap modes, enter only the three-character name. For example, when you use the Center Snap mode, enter cen. CAL Snap modes set the value of the LASTPOINT system variable. CAL snap modes  Abbreviation Snap modeENDENDPOINTINSINSERTINT INTERSECTIONMID MIDPOINTCEN CENTERNEA NEARESTNOD NODEQUA QUADRANTPER PERPENDICULARTANTANGENT The following example uses the Center and Endpoint Snap modes in a CAL expression: (cen+end)/2 CAL prompts for a circle or arc and an object. It then determines the midpoint between the center of the circle or arc and the end of the selected object. Using the Midpoint Snap mode, in the following example CAL prompts for an object and returns a point one unit in the Y direction from the midpoint of the selected object: mid+[,1] The following example uses the Endpoint Snap mode to calculate the centroid of a triangle defined by three endpoints: (end+end+end)/3 The plt and pld functions return a point on a given line. You can specify the position of the point on the line either by its distance from the first point or parametrically by a t parameter. pld(p1,p2,dist) Calculates a point on the line passing through points p1 and p2. The parameter dist defines the distance of the point from the point p1. plt(p1,p2,t) Calculates a point on the line passing through points p1 and p2. The parameter t defines the parametric position of the point on the line. The following are examples of the parameter t: If t=0 the point is p1 If t=0.5 the point is the midpoint between p1 and p2 If t=1 the point is p2 The rot function rotates a point about an axis and returns the resulting point. rot(p,origin,ang) Rotates point p through angle ang about the Z axis passing through the point origin, as shown in the following example:  rot(p,AxP1,AxP2,ang) Rotates point p through an angle ang about the axis passing through points AxP1 and AxP2, as shown in the following example. The axis is oriented from the first point to the second point.  The ill and ilp functions determine intersection points. ill(p1,p2,p3,p4) Determines the intersection point between two lines (p1,p2) and (p3,p4). AutoCAD considers all points three-dimensional. ilp(p1,p2,p3,p4,p5) Determines the intersection point between a line (p1,p2) and a plane passing through three points (p3,p4,p5). Calculating a Distance dist(p1,p2) Determines the distance between two points, p1 and p2. This is the same as the vector expression abs(p1-p2). dpl(p,p1,p2) Determines the shortest distance between point p and the line passing through points p1 and p2.  dpp(p,p1,p2,p3) Determines the distance from a point p to a plane defined by three points (p1,p2,p3).  dist(p1,p2) Determines the distance between two points p1 and p2. This is the same as the vector expression abs(p1-p2). The following example returns half the distance between the centers of two selected objects: dist(cen,cen)/2 The following example finds the distance between the point 3,2,4 and a plane you define by selecting three endpoints: dpp([3,2,4],end, end, end) The rad function determines the radius of a selected object. rad Determines the radius of a selected object. The object can be a circle, an arc, or a 2D polyline arc segment. The following example uses rad with the CIRCLE command. The radius of the new circle is two-thirds of the radius of the selected polyline arc segment: Command: circle Specify center point for circle or [3P/2P/Ttr (tangent tangent radius)]: cen of Select the circle Specify radius of circle or [Diameter] : 'cal >> Expression: 2/3*rad >> Select circle, arc or polyline segment for RAD function: Select the circle  The ang function determines the angle between two lines. Angles are measured counterclockwise with respect to either the X axis, in the two-dimensional case, or to a user-specified axis, in the three-dimensional case. ang(v) Determines the angle between the X axis and vector v. The vector v is considered 2D, projected on the XY plane of the current UCS. ang(p1,p2) Determines the angle between the X axis and the line (p1,p2), oriented from p1 to p2. The points are considered 2D, projected on the XY plane of the current UCS. ang(apex,p1,p2) Determines the angle between lines (apex,p1) and (apex,p2). The points are considered 2D, projected on the XY plane of the current UCS. ang(apex,p1,p2,p) Determines the angle between lines (apex,p1) and (apex,p2). The lines are considered 3D. The last parameter, point p, is used to define the orientation of the angle. The angle is measured counterclockwise with respect to the axis going from apex to p. The following examples show how angles are measured.  CAL CAL evaluates expressions according to standard mathematical rules of precedence: Expressions in parentheses first, starting with the innermost set Operators in standard order: exponents first, multiplication and division second, and addition and subtraction last Operators of equal precedence from left to right Numeric Expressions Numeric expressions are real integer numbers and functions combined with the operators in the following table. Numeric operators  Operator  Operation ( )Groups expressions^Indicates exponentiation* , /Multiplies, divides+, -Adds, subtracts The following are examples of numeric expressions: 3 3 + 0.6 (5.8^2) + PI Vector Expressions A vector expression is a collection of points, vectors, numbers, and functions combined with operators in the following table. Vector operators  Operator  Operation ( )Groups expressions& Determines the vector product of vectors (as a vector) [a,b,c]&[x,y,z] = [ (b*z) - (c*y) , (c*x) - (a*z) , (a*y) - (b*x) ] * Determines the scalar product of vectors (as a real number) [a,b,c]*[x,y,z] = ax + by + cz*, / Multiplies, divides a vector by a real number a*[x,y,z] = [a*x,a*y,a*z]+ , -Adds, subtracts vectors (points) [a,b,c] + [x,y,z] = [a+x,b+y,c+z] The following are examples of vector expressions: A+[1,2,3] provides the point positioned [1,2,3] units relative to point A. The expression [2<45<45] + [2<45<0] - [1.02, 3.5, 2] adds two points and subtracts a third point. The first two points are in spherical coordinates. 'CAL (enter) (MID+MID)/2 (enter) will select a point midway between two midpoints 'CAL (enter) (INT+INT)/2 (enter) will select a point midway between two intersections 'CAL (enter) (CEN+CEN)/2 (enter) will select a point midway between two centers 'CAL (enter) MEE (enter) returns the midpoint between two end points, end point snaps will be selected automatically. 'CAL (enter) (CUR+CUR)/2 (enter) = returns midpoint between any two points you supply. 'CAL (enter) PLT(END,END,1/3) (enter) = returns a point 1/3 between endpoints. 'CAL (enter) ANG(NEA,NEA) (enter) = returns an angle from 2 points, running snap set to Nearest. 'CAL (enter) ANG(INT,NEA,NEA) (enter) = returns an internal angle, requires an apex point of the angle be supplied. 'CAL (enter) RAD (enter) = returns the radius of an existing arc or circle. 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