Handy object to draw a graphic or portions thereof to different screen

positions.

exec/load/graphic.js

+// $Id$
+
+/*
+ * "Graphic" object
+ * Allows a graphic to be stored in memory and portions of it redrawn on command
+ */
+
+function Graphic(width,height,attribute,char)
+{
+	if(char==undefined)
+		this.char=' ';
+	else
+		this.char=char;
+	if(attribute==undefined)
+		this.attribute=7;
+	else
+		this.attribute=attribute;
+	if(height==undefined)
+		this.height=24;
+	else
+		this.height=height;
+	if(width==undefined)
+		this.width=80;
+	else
+		this.width=width;
+
+	this.data=new Array(width,height);
+	var x;
+	var y;
+	for(y=0; y<this.height; y++) {
+		for(x=0; x<this.width; x++) {
+			this.data[x][y]=new Object;
+			this.data[x][y].char=char;
+			this.data[x][y].attr=attribute;
+		}
+	}
+	this.draw=Graphic_draw;
+}
+
+function Graphic_draw(xpos,ypos,width,height,xoff,yoff)
+{
+	var x;
+	var y;
+
+	if(xpos==undefined)
+		xpos=1;
+	if(ypos==undefined)
+		ypos=1;
+	if(width==undefined)
+		width=this.width;
+	if(height==undefined)
+		height=this.height;
+	if(xoff==undefined)
+		xoff=0;
+	if(yoff==undefined)
+		yoff=0;
+	if(xoff+width > this.width || yoff+height > this.height) {
+		alert("Attempt to draw from outside of graphic");
+		return(false)
+	}
+	if(xpos+width > console.screen_columns || ypos+height > console.screen_rows) {
+		alert("Attempt to draw outside of screen");
+		return(false);
+	}
+	for(y=0;y<height; y++) {
+		gotoxy(xpos,ypos+y);
+		for(x=0; x<width; x++) {
+			// Do not draw to the bottom left corner of the screen-would scroll
+			if(xpos+x != console.screen_columns
+					|| ypos+y != console.screen_rows) {
+				console.attributes=this.data[x+xoff][y+yoff].attr;
+				console.write(this.data[x+xoff][y+yoff].char;
+			}
+		}
+	}
+	return(true);
+}