I started trying to do something similar with Game Maker, a closed source but free visual language.
The proof of Pythagoras was too hard for me so I settled for a demonstration see http://rupert.id.au/schoolgamemaker/samples3/ It wouldnt be too hard to port to Turtle Art or Etoys Here's the code if it is of any use for (i=x1;i<=x2;i+=25) /* baseline */ { draw_line(i,y1,i,y1+x2-x1) /*base verticals */ draw_line(x1,i+y1-x1,x2,i+y1-x1) /*base horizontals */ } for (i=y1;i>=y2;i-=25) /*vertical */ { draw_line(x2-i+y1,y1,x2-i+y1,y2) /*verticals*/ draw_line(x2,i,x2+y1-y2,i) /*horizontals*/ } hyp=sqrt(sqr(y1-y2)+sqr(x2-x1)) alpha=arctan2((y1-y2),(x2-x1)) room_caption="Pythagoras' Theorem horiz.="+string(sqr(x1-x2)/625)+ "squares vert.="+string(sqr(y1-y2)/625)+"squares hyp=" +string((sqr(x1-x2)+sqr(y1-y2))/625)+"squares" for(i=0;i<=hyp/25;i+=1) { draw_line(x1-i*25*sin(alpha),y1-i*25*cos(alpha), /*parallel*/ x2-i*25*sin(alpha),y2-i*25*cos(alpha)) draw_line(x1+i*25*cos(alpha),y1-i*25*sin(alpha), /*perp*/ x1-hyp*sin(alpha)+i*25*cos(alpha),y1-hyp*cos(alpha)-i*25*sin(alpha)) } Tony _______________________________________________ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
