public override void Draw(GameTime gameTime)
{
int width = Game.GraphicsDevice.PresentationParameters.BackBufferWidth;
int height = Game.GraphicsDevice.PresentationParameters.BackBufferHeight;
if (show)
{
spriteBatch.Begin();
spriteBatch.Draw(background, new Rectangle(0, height / 2, width, height), Color.White);
String text;
if (false && drawCursor && cursorOffset >= inputBuffer.Length)
{
text = inputBuffer.ToString() + "_";
}
else if (false && drawCursor && cursorOffset > 0 && inputBuffer[cursorOffset] != '\n')
{
char temp = inputBuffer[cursorOffset];
inputBuffer[cursorOffset] = '_';
text = inputBuffer.ToString();
inputBuffer[cursorOffset] = temp;
}
else
{
text = inputBuffer.ToString();
}
string cursorText = new String((from i in Enumerable.Range(0, text.Length + 1)
select i == cursorOffset ? '_' :
(i >= 0 && i < inputBuffer.Length && inputBuffer[i] == '\n' ? '\n' : ' ')).ToArray());
if (drawCursor)
{
spriteBatch.DrawString(font, cursorText, new Vector2(CURSOR_START_X, CURSOR_START_Y), Color.Blue);
}
spriteBatch.DrawString(font, text, new Vector2(CURSOR_START_X, CURSOR_START_Y), Color.Black);
if (lastResult.HasValue)
{
EvalResult result = lastResult.Value;
spriteBatch.DrawString(font, result.Message, new Vector2(19, 19), Color.Black);
spriteBatch.DrawString(font, result.Message, new Vector2(20, 20), Color.White);
}
spriteBatch.DrawString(font, "You have to define two functions 'visible' and 'material',\n" +
"both accepting a Point3D as parameter. 'visible' must return for a point if it\n" +
"is visible, material returns the material index (see spritesheet).\n" +
"Press F5 to evaluate the script and let the program create the cube geometry\n" +
"which is defined by those two functions. Press CTRL + C to close the console.",
new Vector2(20, 40), Color.White);
spriteBatch.End();
}
base.Draw(gameTime);
}
public EvalResult Evaluate(String input)
{
String prelude =
"import clr\n" +
"clr.AddReference('Mathcraft')\n" +
"from Mathcraft import *\n" +
"clr.AddReference('System.Core')\n" +
"from System import Func\n";
input = prelude + input;
String suffix = "\n" +
"wrapper.visible_func = Func[Point3D,bool](visible)\n" +
"wrapper.material_func = Func[Point3D,int](material)\n";
if (input.Contains("def visible") && input.Contains("def material"))
{
input += suffix;
}
EvalResult result = new EvalResult();
Point3D size = new Point3D(20, 20, 20);
Point3D pos = new Point3D(-50, -50, -200);
Func <Point3D, bool> visFunc = null;
Func <Point3D, int> matFunc = null;
var scope = engine.CreateScope();
scope.SetVariable("wrapper", wrapper);
scope.SetVariable("pos", pos);
scope.SetVariable("size", size);
scope.SetVariable("visibility", visFunc);
scope.SetVariable("material", matFunc);
ScriptSource source = engine.CreateScriptSourceFromString(input, SourceCodeKind.Statements);
CompiledCode compiled = null;
wrapper.material_func = null;
wrapper.visible_func = null;
try
{
compiled = source.Compile();
}
catch (Exception ex)
{
result.Success = false;
result.Message = ex.Message;
return(result);
}
// Executes in the scope of Python
compiled.Execute(scope);
bool gotPos = scope.TryGetVariable <Point3D>("pos", out pos);
bool gotSize = scope.TryGetVariable <Point3D>("size", out size);
if (wrapper.visible_func != null && wrapper.material_func != null)
{
var param = new GeometryParameters(pos, size,
wrapper.visible_func, wrapper.material_func);
result.GeometryParameters = param;
var gm = game.Services.GetService(typeof(GeometryManager)) as GeometryManager;
gm.Clear();
try
{
gm.AddGeometry(param);
}
catch (Exception ex)
{
result.Message = ex.Message;
result.Success = false;
}
}
result.Message = "OK";
result.Success = true;
return(result);
}
