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reset transformations before each draw() iteration

	replicate Processing behaviour by resetting all transformations (translate()/rotate()) before
	each draw() loop iteration

--- a/a.h

+++ b/a.h

@@ -13,6 +13,7 @@

 void	drawcanvas(void);

 void	initstate(lua_State*);

+void	reset(void);

 void	registerapi(lua_State*);

 Image*	color(int, int, int, int);

--- a/api.c

+++ b/api.c

@@ -46,6 +46,13 @@

 }

 void

+reset(void)

+{

+	origin = ZP;

+	angle = 0.0;

+}

+

+void

 drawcanvas(void)

 {

 	draw(screen, screen->r, canvas, nil, ZP);

--- a/slug.c

+++ b/slug.c

@@ -131,6 +131,7 @@

 	drawing = 1;

 	for(;;){

 		if(looping){

+			reset();

 			t0 = nsec();

 			lcall(L, "draw");

 			t1 = nsec();