新课标青岛版小学信息技术六年级上册logo操作实例.doc

使用pe命令定义过程，画出下面图形例1：画荷花图to hu repeat 9rt 5 fd 50*0.174 rt 5endto ye repeat 2hu rt 90endto hehua draw setpc 13 lt 110 repeat 6ye rt 30 setpc 2 rt 100 hu htend例2、小飞机图to zfxrepeat 4fd 40 rt 90endto sjxrepeat 3fd 40 rt 120endto yuanrepeat 36rt 5 fd 15*0.174 rt 5endto lxrepeat 2fd 40 rt 60 fd 40 rt 120endto fjdraw setpc 9rt 90 sjx lt 90 zfx fd 40 rt 180 lx lt 150 sjx rt 60fd 40 rt 30 lx lt 150 fd 30 yuan fd 10 lt 120 fd 10 yuanhtend（1）给变量赋值调用例如：to yuan :rrepeat 36rt 5 fd :r*0.174 rt 5endto qiu :ndrawrepeat :nyuan 60 rt 360/:nhtendqiu 10qiu 20qiu 30调用正六边形的参数过程，画出下面图形。调用菱形的参数过程，画出下面图形。to lx :a :drepeat 2fd :a rt :d fd :a rt 180-:dendto lxtudrawrepeat 5lx 40 30 fd 40 rt 30 fd 40 rt 72-30htendto hu :d :r repeat :drt 5 fd :r*0.174 rt 5endto san draw hu 18 60 rt 90 pu fd 120 rt 90 pd repeat 3hu 18 20 rt 180 lt 90 pu fd 60 rt 90 fd 70 pd bk 10 pu bk 40 pd bk 100 rt 180 hu 18 20 ht end调用右弧的参数过程，画出下面图形。（2）变量一起被调用例如：to zwbx :srepeat 5fd :s rt 72endto wbxtu :n :sdrawrepeat :nzwbx :s rt 360/:nhtend wbxtu 5 40wbxtu 10 50wbxtu 20 60下面图形是调用正多边形的变量过程画出的，看看是怎样画出的？to dbx :n :brepeat :nfd :b rt 360/:nendto dd :n :bdrawrepeat :ndbx :n :b fd :b lt 360/:nhtend画正三角形的条件递归过程to lxt :aif :a100 stopsetpc 6 repeat 3fd :a rt 120 rt 20lxt :a+2endlxt 1画一排小树的条件递归过程to xs :aif :a5 stopsetpc 2fd :a rt 90 fd :a/2 lt 120repeat 3fd :a lt 120rt 30 pu bk :a/2 rt 60 fd :a lt 60 pdxs :a-10endxs 50尾递归过程的探究to a1 :b :n if :n1 stop repeat 4fd :b rt 90 fd :b a1 :b :n-1endto a2 :b :nif :n1 stoprepeat 4fd :b rt 90fd :ba2 :b/2 :n-1enda2 100 4a1 100 4to shizi :r :n if :n2 fd 0.5*:r shy 90 :r stop fd :r shz 90 :r shizi :r*0.8 :n-1end to rhu :n :r repeat :nfd :r*pi/180 rt 1endto shy :n :r lt :n/2 repeat 2rhu :n :r rt 180-:n rt :n/2endto shz