怎样把三维坐标调成二维坐标啊

我用三维视图弄成这个样子，取消后不知道怎么把三维坐标调成二维坐标了

菜单命令：工具-选项-系统-启动，选择显示“启动”对话框，再打开软件的时候会让你选择三维的还是cad经典，选择经典

那要看怎么投影了 直接去掉z坐标也是变成2d的，只不过是把z坐标都压缩在一个平面了 下面的是轴测图 option base 1 private type linenum sp as integer ep as integer end type dim px(), py(), pz() dim pt(12, 4) dim ln(18) as linenum dim lp1(6) as pointapi private sub form_load() show px = array(-180, -320, -320, -250, -250, -180, -180, -320, -320, -250, -250, -180) py = array(0, 0, 0, 0, 0, 0, 120, 120, 120, 120, 120, 120) pz = array(50, 50, 110, 110, 200, 200, 50, 50, 110, 110, 200, 200) pl = array(1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 1, 7, 8, 8, 9, 9, _ 10, 10, 11, 11, 12, 12, 7, 1, 7, 2, 8, 3, 9, 4, 10, 5, 11, 6, 12) for i = 1 to 12 pt(i, 1) = px(i) pt(i, 2) = py(i) pt(i, 3) = pz(i) pt(i, 4) = 1 next for i = 1 to 18 ln(i).sp = pl(2 * i - 1) ln(i).ep = pl(2 * i) next i dim t0(4, 4), t(4, 4), p(12, 4) unit3d t0() zhouce t mat3d t0(), t() mat3d1 pt, t0, p, 12 for i = 1 to 18 pic.line (p(ln(i).sp, 1), p(ln(i).sp, 2))-(p(ln(i).ep, 1), p(ln(i).ep, 2)) next for i = 1 to 6 lp1(i).x = p(i, 1): lp1(i).y = p(i, 2) next end sub 'option explicit option base 1 const axis_x =