Refactoring code for better readability

diff --git a/Graphics/3D/tank1.bas b/Graphics/3D/tank1.bas
index 22246a8..6b34f9f 100755 (executable)
--- a/Graphics/3D/tank1.bas
+++ b/Graphics/3D/tank1.bas
@@ -29,8 +29,8 @@ DECLARE SUB mulcor ()
 DECLARE SUB nait3d ()
 DECLARE SUB calcsin ()
 DEFINT A-Y
-DIM SHARED xn(1000), yn(1000), czn(1000) ' original points
-DIM SHARED x(1000), y(1000), cz(1000)    ' Rotated points
+DIM SHARED xn(1000), yn(1000), czn(1000) ' points transformed to on-screen coordinates
+DIM SHARED pointX(1000), pointY(1000), pointZ(1000) ' points in 3D space
 DIM SHARED Xs1(1000), Ys1(1000), Xe1(1000), Ye1(1000) ' Old rotated points
 DIM SHARED pointers1(1000), pointers2(1000)   ' Connected points
 DIM SHARED cosine&(360), sine&(360)    ' SIN & COS table
@@ -497,8 +497,8 @@ DEFSNG Z
 SUB getcor
 ' Loading original points and connected points
 FOR a = 0 TO 10000
-    READ x(a), y(a), cz(a)
-    IF x(a) = 999 THEN x(a) = 0: y(a) = 0: cz(a) = 0: GOTO 1
+    READ pointX(a), pointY(a), pointZ(a)
+    IF pointX(a) = 999 THEN pointX(a) = 0: pointY(a) = 0: pointZ(a) = 0: GOTO 1
 NEXT
 1
 np = a
@@ -600,9 +600,9 @@ DO
 
     ' Rotating points
     FOR a = 0 TO np - 1
-        x1 = x(a) + myx
-        y1 = y(a) + myz
-        pz1 = cz(a) + myy
+        x1 = pointX(a) + myx
+        y1 = pointY(a) + myz
+        pz1 = pointZ(a) + myy
 
         ' Applying rotation matrix
         x2 = (x1 * c1& - pz1 * s1&) \ 1024
@@ -707,33 +707,33 @@ IF smes < 1 THEN smes = 15
 b = smes
 
 FOR a = TracksBeginp TO TracksBeginp + 48 STEP 2
-    x(a) = Tracksx(b) - Tracksxp
-    y(a) = Tracksy(b)
-    cz(a) = 50
-    x(a + 1) = Tracksx(b) - Tracksxp
-    y(a + 1) = Tracksy(b)
-    cz(a + 1) = 30
+    pointX(a) = Tracksx(b) - Tracksxp
+    pointY(a) = Tracksy(b)
+    pointZ(a) = 50
+    pointX(a + 1) = Tracksx(b) - Tracksxp
+    pointY(a + 1) = Tracksy(b)
+    pointZ(a + 1) = 30
     b = b + 15
 NEXT a
 
 b = smes
 FOR a = TracksBeginp + 48 TO TracksBeginp + 94 STEP 2
-    x(a) = Tracksx(b) - Tracksxp
-    y(a) = Tracksy(b)
-    cz(a) = -50
-    x(a + 1) = Tracksx(b) - Tracksxp
-    y(a + 1) = Tracksy(b)
-    cz(a + 1) = -30
+    pointX(a) = Tracksx(b) - Tracksxp
+    pointY(a) = Tracksy(b)
+    pointZ(a) = -50
+    pointX(a + 1) = Tracksx(b) - Tracksxp
+    pointY(a + 1) = Tracksy(b)
+    pointZ(a + 1) = -30
     b = b + 15
 NEXT a
 
 REM Moving the tank
 FOR a = 0 TO 84
-    x(a) = x(a) - ssu
+    pointX(a) = pointX(a) - ssu
 NEXT a
 
-IF x(84) > 0 THEN ssu = 1
-IF x(83) < -400 THEN ssu = -1
+IF pointX(84) > 0 THEN ssu = 1
+IF pointX(83) < -400 THEN ssu = -1
 
 END SUB
 
@@ -775,8 +775,8 @@ np = np + 0
 BridgeBeginp = np
 
 5
-READ x(np), y(np), cz(np)
-IF x(np) = 999 THEN x(np) = 0: y(np) = 0: cz(np) = 0: GOTO 3
+READ pointX(np), pointY(np), pointZ(np)
+IF pointX(np) = 999 THEN pointX(np) = 0: pointY(np) = 0: pointZ(np) = 0: GOTO 3
 np = np + 1
 GOTO 5