more zoom/center fixes. RLEs now load centered and visible.

TODO.md

@@ -2,9 +2,16 @@
 
 - changing options mid-game has no effect in most cases, even after a restart
 
-- RLE file loading works, but if world is larger than screen, center is invisible.
-
 - Statefile loading does not work correclty anymore. With larger grids
   everything  is empty.  With square  grids part  of the  grid is  cut
   off. Smaller grids load though
   
+- Also  when loading a state  file, centering doesn't work  anymore, I
+  think the geom calculation is overthrown by the parser func. So, put
+  this calc into its own func and  always call. Or - as stated below -
+  put it onto camera.go and call from Init().
+  
+- Zoom 0 on reset only  works when world<screen.  otherwise zoom would
+  be negative So, on Init() memoize  centered camera position or add a
+  Center() function  to camera.go.  Then on  reset calculate  the zoom
+  level so that the world fits into the screen.

config.go

@@ -9,7 +9,6 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/alecthomas/repr"
 	"github.com/spf13/pflag"
 	"github.com/tlinden/golsky/rle"
 )
@@ -80,14 +79,15 @@ func (config *Config) ParseGeom(geom string) error {
 	// size  is smaller than  the screen  in a centered  position, but
 	// it's zero if it's equal or larger than the screen.
 	config.InitialCamPos = make([]float64, 2)
-	if config.Width*config.Cellsize < config.ScreenWidth {
-		config.InitialCamPos[0] = float64(((config.ScreenWidth - (config.Width * config.Cellsize)) / 2) * -1)
-		repr.Println("x", config.InitialCamPos[0])
+
+	config.InitialCamPos[0] = float64(((config.ScreenWidth - (config.Width * config.Cellsize)) / 2) * -1)
+	if config.Width*config.Cellsize >= config.ScreenWidth {
+		// must be positive if world wider than screen
+		config.InitialCamPos[0] = math.Abs(config.InitialCamPos[0])
 	}
 
 	if config.Height*config.Cellsize > config.ScreenHeight {
 		config.InitialCamPos[1] = math.Abs(float64(((config.ScreenHeight - (config.Height * config.Cellsize)) / 2)))
-		repr.Println("y", config.InitialCamPos[1])
 	}
 
 	return nil

scene-play.go

@@ -19,7 +19,7 @@ type Images struct {
 }
 
 const (
-	DEBUG_FORMAT = "FPS: %0.2f, TPG: %d, M: %0.2fMB, Generations: %d\nScale: %.02fZoom: %d, Cam: %.02f,%.02f Cursor: %d,%d  %s"
+	DEBUG_FORMAT = "FPS: %0.2f, TPG: %d, M: %0.2fMB, Generations: %d\nScale: %.02f, Zoom: %d, Cam: %.02f,%.02f Cursor: %d,%d  %s"
 )
 
 type ScenePlay struct {