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APPENDICES
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Pie ExprN1,ExprN2,ExprN3,ExprN4{,ExprN5{,ExprN6{,ExprN7{,ExprN8}}}} This command is very similar to the command Arc above. The difference is that radials from the center of the bounding rectangle to the start and end points of the arc will also be drawn. Also the inside will be lled with the default background color or the color ExprN8 if given. This command allows for creating Pie graphs. The circle/ellipse is de ned by the bounding rectangle de ned by X1=ExprN1, Y1=ExprN2 and X2=ExprN3, Y2=ExprN4. If ExprN7 is given then the pen color will be temporarily set to ExprN7. If ExprN8 is given the pie is lled with the color ExprN8. ExprN5 and ExprN6 are angles in radians that specify the start point of the arc and the length of the arc. The angles are de ned counter-clock-wise from the right hand horizontal position (i.e. positive x-axis). If ExprN6 is zero or an even multiple of Pi() (i.e. 0,360,720... degrees) the entire circle/ellipse will be drawn. ExprN5 and 6 default to 0 if not given. ExprN5 de nes the angle (in radians) from the positive x-axis (counterclockwise) at which to start drawing the arc. ExprN6 de nes the length of the arc (angle inside the arc in radians). To specify angles in degrees use the function DtoR(). ExprN7 and ExprN8 will only affect the current drawing, not any subsequent drawings. If you desire to specify ExprN8 you must also specify ExprN5,6,7, but if ExprN7 is less than 0 it will be ignored. Also if ExprN8 is less than 0 it will be ignored. Example:
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n = 360/16 for i=0 to 15 Pie 100,100,500,500,DtoR(i*n),DtoR(n),i,i next Arc 100,100,500,500,0,0,3,blue ERectangle 100,100,500,500,5,lightgreen
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FloodFill ExprN1,ExprN2{,ExprN3{,ExprN4}} Given a coordinate ExprN1, ExprN2 the interpreter will start lling the area surrounding this coordinate with old color given by ExprN4 and replacing it with new color given by ExprN3. It will do so as long as the pixels have the old color, but it will not convert any pixels with a different color from old color. So if you have a box that has color white surrounded by color blue, doing FloodFill X,Y,Red,White will ll the box with the new color red, but only the box since it will not ow into the blue areas. (See ReadPixel and SetPixel commands above.) ExprN3 and ExprN4 are optional. If ExprN4 is not given then the color of the pixel at ExprN1, ExprN2 position will be used as the old color. If ExprN3 is not given then the current pen color will be used as the new color. DrawShape ExprS,ExprN2,ExprN3{,ExprN4,ExprN5} This command will draw an image speci ed by the string in ExprS. ExprN2 and ExprN3 are screen position x, y. Optional ExprN4 and ExprN5 are to specify a scale factor (pixels) and color correspondingly. If scale is not given then 1 is assumed and if color is not given the default pen color is used. If you are to specify the color you must specify the scale. If color is a negative number then the color will be the background color. This is handy in appearing to erase the image. The data in ExprS indicates how to move (LineTo) from the x, y position (see Sec. C.7.6 for more details on the DrawShape command).
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C.7.3 ARRAY COMMANDS Dim VarA[ExprN{,ExprN...}] This will specify that VarA is an array of the dimensions [ExprN{,ExprN...}] the brackets are required and so is the comma between each dimension. You can use an array element anywhere as any variable (see Sec. B.7.4). The Dim statement establishes the maximum value for each dimension and the over all dimension of the array. The index of the dimension starts at 0 and ends at ExprN-1. ExprN must result in an integer value, otherwise an error will occur. Each element of the array can be any of the data types (string, oat, or integer). If you try to access any unassigned element an error will occur. If you try to access outside the speci ed range in the Dim statement an error will occur. If you have a two-dimensional array Dim N[4,5] then there are 4 rows and 5 columns, that is, there are 4 rows with 5 elements in each row. If you have Dim N[6,7,8] then there are 6 rows where each element in the row constitutes a matrix in itself, where those matrices each have 7 rows and 8 columns. This can go on for as long as you care, but remember that the row count is the rst dimension and the second dimension is a count of elements in each row. Each element in the row can be a string, integer, oat, or another matrix as described above.
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Dim XY[2,4,5] //means that XY is an array of 3D and that the // rst dimension goes from 0 to 1 //second dimension goes from 0 to 3 //third dimension goes from 0 to 4 //assigns element [1,3,2] as given XY[1,3,2] = sin(pi(2.0/3))+4 print XY[1,3,2] //prints element [1,3,2] XY[2,4,5] = 9 //will cause an error outside the range Print XY[0,3,1] //will cause an error because [0,3,1] // was not assigned
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Data VarA;Expr{,Expr....} This command creates an array of one dimension named VarA and puts all the resulting values from the Expr s into the array. VarA is the array name, the colon after the name is required to separate the name from the data. The data is separated by a comma. Expr can result in any value type (string, integer, or oat). If you specify the same array name in two or more Data statements then the data is appended to the end of the array. If you desire to erase the array, so as to start populating it at the rst element, use Dim VarA[0] where VarA is the array name used in the Data statement. If you have previously dimensioned VarA before issuing the Data statements, then you must use the Dim VarA[0] before you use the Data statements. If you do not the data will not be loaded into the array.
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data test;1,2, some text ,4.5,sin(3/4.6),length( test ) data test;66,44.5,log(3) print test[7] //print 44.5 print test[2] //prints some text print test[0]+test[3] //prints 5.5 dim test[0] //effectively erases the array data
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