Find the intersection of two lines: Difference between revisions
Applesoft BASIC
(Find the intersection of two lines in various BASIC dialents (QBasic, BASIC256, Run BASIC, True BASIC and Yabasic)) |
(Applesoft BASIC) |
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=={{header|BASIC}}==
==={{header|Applesoft BASIC}}===
<lang gwbasic> 0 A = 1:B = 2: HOME : VTAB 21: HGR : HCOLOR= 3: FOR L = A TO B: READ X1(L),Y1(L),X2(L),Y2(L): HPLOT X1(L),Y1(L) TO X2(L),Y2(L): NEXT : DATA4,0,6,10,0,3,10,7
1 GOSUB 5: IF NAN THEN PRINT "THE LINES DO NOT INTERSECT, THEY ARE EITHER PARALLEL OR CO-INCIDENT."
2 IF NOT NAN THEN PRINT "POINT OF INTERSECTION : "X" "Y
3 PRINT CHR$ (13)"HIT ANY KEY TO END PROGRAM": IF NOT NAN THEN FOR K = 0 TO 1 STEP 0:C = C = 0: HCOLOR= 3 * C: HPLOT X,Y: FOR I = 1 TO 30:K = PEEK (49152) > 127: NEXT I,K
4 GET K$: TEXT : END
5 FOR L = A TO B:S$(L) = "NAN": IF X1(L) < > X2(L) THEN S(L) = (Y1(L) - Y2(L)) / (X1(L) - X2(L)):S$(L) = STR$ (S(L))
6 NEXT L:NAN = S$(A) = S$(B): IF NAN THEN RETURN
7 IF S$(A) = "NAN" AND S$(B) < > "NAN" THEN X = X1(A):Y = (X1(A) - X1(B)) * S(B) + Y1(B): RETURN
8 IF S$(B) = "NAN" AND S$(A) < > "NAN" THEN X = X1(B):Y = (X1(B) - X1(A)) * S(A) + Y1(A): RETURN
9 X = (S(A) * X1(A) - S(B) * X1(B) + Y1(B) - Y1(A)) / (S(A) - S(B)):Y = S(B) * (X - X1(B)) + Y1(B): RETURN</lang>
==={{header|QBasic}}===
{{works with|QBasic|1.1}}
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