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CU Amiga Magazine's Super CD-ROM 11 (1997)(EMAP Images)(GB)(Track 1 of 3)[!][issue 1997-06].iso
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rectangles.mod
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Oberon Text
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1990-01-01
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127 lines
Syntax10.Scn.Fnt
MODULE Rectangles; (*NW 25.2.90 / 1.2.92*)
IMPORT Display, Files, Input, Printer, Texts, Oberon, Graphics, GraphicFrames;
TYPE
Rectangle* = POINTER TO RectDesc;
RectDesc* = RECORD (Graphics.ObjectDesc)
lw*, vers*: INTEGER
END ;
VAR
method*: Graphics.Method;
shade: INTEGER;
PROCEDURE New*;
VAR r: Rectangle;
BEGIN NEW(r); r.do := method; Graphics.new := r
END New;
PROCEDURE Copy(src, dst: Graphics.Object);
BEGIN dst.x := src.x; dst.y := src.y; dst.w := src.w; dst.h := src.h; dst.col := src.col;
dst(Rectangle).lw := src(Rectangle).lw; dst(Rectangle).vers := src(Rectangle).vers
END Copy;
PROCEDURE mark(f: GraphicFrames.Frame; col, x, y: INTEGER);
BEGIN Display.ReplConstC(f, col, x-4, y, 4, 4, 0)
END mark;
PROCEDURE Draw(obj: Graphics.Object; VAR M: Graphics.Msg);
VAR x, y, w, h, lw, col: INTEGER; f: GraphicFrames.Frame;
PROCEDURE draw(col: INTEGER);
BEGIN
Display.ReplConstC(f, col, x, y, w, lw, 0);
Display.ReplConstC(f, col, x+w-lw, y, lw, h, 0);
Display.ReplConstC(f, col, x, y+h-lw, w, lw, 0);
Display.ReplConstC(f, col, x, y, lw, h, 0)
END draw;
BEGIN
WITH M: GraphicFrames.DrawMsg DO
x := obj.x + M.x; y := obj.y + M.y; w := obj.w; h := obj.h; f := M.f;
lw := obj(Rectangle).lw;
IF (x < f.X1) & (x+w > f.X) & (y < f.Y1) & (y+h > f.Y) THEN
IF M.col = Display.black THEN col := obj.col ELSE col := M.col END ;
IF M.mode = 0 THEN
draw(col);
IF obj.selected THEN mark(f, Display.white, x+w-lw, y+lw) END ;
IF obj(Rectangle).vers # 0 THEN Display.ReplPatternC(f, col, Display.grey0, x, y, w, h, x, y, 1) END
ELSIF M.mode = 1 THEN mark(f, Display.white, x+w-lw, y+lw)
ELSIF M.mode = 2 THEN mark(f, Display.black, x+w-lw, y+lw)
ELSIF obj(Rectangle).vers = 0 THEN draw(f.col); mark(f, f.col, x+w-lw, y+lw)
ELSE Display.ReplConstC(f, f.col, x, y, w, h, 0)
END
END
END
END Draw;
PROCEDURE Selectable(obj: Graphics.Object; x, y: INTEGER): BOOLEAN;
BEGIN
RETURN (obj.x + obj.w - 4 <= x) & (x <= obj.x + obj.w) & (obj.y <= y) & (y <= obj.y + 4)
END Selectable;
PROCEDURE Handle(obj: Graphics.Object; VAR M: Graphics.Msg);
VAR x0, y0, x1, y1, dx, dy: INTEGER; k: SET;
BEGIN
IF M IS Graphics.WidMsg THEN obj(Rectangle).lw := M(Graphics.WidMsg).w
ELSIF M IS Graphics.ColorMsg THEN obj.col := M(Graphics.ColorMsg).col
ELSIF M IS GraphicFrames.CtrlMsg THEN
WITH M: GraphicFrames.CtrlMsg DO
WITH obj: Rectangle DO
M.res := 1; x0 := obj.x + obj.w + M.f.x; y0 := obj.y + M.f.y;
mark(M.f, Display.white, x0 - obj.lw, y0 + obj.lw);
REPEAT Input.Mouse(k, x1, y1);
DEC(x1, (x1-M.f.x) MOD 4); DEC(y1, (y1-M.f.y) MOD 4);
Oberon.DrawCursor(Oberon.Mouse, Oberon.Arrow, x1, y1)
UNTIL k = {};
mark(M.f, Display.black, x0 - obj.lw, y0 + obj.lw);
IF (x0 - obj.w < x1) & (y1 < y0+ obj.h) THEN
GraphicFrames.EraseObj(M.f, obj);
dx := x1 - x0; dy := y1 - y0;
INC(obj.y, dy); INC(obj.w, dx); DEC(obj.h, dy);
GraphicFrames.DrawObj(M.f, obj)
END
END
END
END
END Handle;
PROCEDURE Read(obj: Graphics.Object; VAR R: Files.Rider; VAR C: Graphics.Context);
VAR w, v: SHORTINT; len: INTEGER;
BEGIN Files.ReadInt(R, len); Files.Read(R, w); Files.Read(R, v);
obj(Rectangle).lw := w; obj(Rectangle).vers := v
END Read;
PROCEDURE Write(obj: Graphics.Object; cno: SHORTINT; VAR W: Files.Rider; VAR C: Graphics.Context);
BEGIN Graphics.WriteObj(W, cno, obj); Files.WriteInt(W, 2);
Files.Write(W, SHORT(obj(Rectangle).lw)); Files.Write(W, SHORT(obj(Rectangle).vers))
END Write;
PROCEDURE Print(obj: Graphics.Object; x, y: INTEGER);
VAR w, h, lw, s: INTEGER;
BEGIN INC(x, obj.x * 4); INC(y, obj.y * 4); w := obj.w * 4; h := obj.h * 4;
lw := obj(Rectangle).lw * 2; s := obj(Rectangle).vers;
Printer.ReplConst(x, y, w, lw);
Printer.ReplConst(x+w-lw, y, lw, h);
Printer.ReplConst(x, y+h-lw, w, lw);
Printer.ReplConst(x, y, lw, h);
IF s > 0 THEN Printer.ReplPattern(x, y, w, h, s) END
END Print;
PROCEDURE Make*; (*command*)
VAR x0, x1, y0, y1: INTEGER;
R: Rectangle;
G: GraphicFrames.Frame;
BEGIN G := GraphicFrames.Focus();
IF (G # NIL) & (G.mark.next # NIL) THEN
GraphicFrames.Deselect(G);
x0 := G.mark.x; y0 := G.mark.y; x1 := G.mark.next.x; y1 := G.mark.next.y;
NEW(R); R.col := Oberon.CurCol;
R.w := ABS(x1-x0); R.h := ABS(y1-y0);
IF x1 < x0 THEN x0 := x1 END ;
IF y1 < y0 THEN y0 := y1 END ;
R.x := x0 - G.x; R.y := y0 - G.y;
R.lw := Graphics.width; R.vers := shade; R.do := method;
Graphics.Add(G.graph, R);
GraphicFrames.Defocus(G); GraphicFrames.DrawObj(G, R)
END
END Make;
PROCEDURE SetShade*;
VAR S: Texts.Scanner;
BEGIN Texts.OpenScanner(S, Oberon.Par.text, Oberon.Par.pos); Texts.Scan(S);
IF S.class = Texts.Int THEN shade := SHORT(S.i) END
END SetShade;
BEGIN shade := 0; NEW(method);
method.module := "Rectangles"; method.allocator := "New";
method.new := New; method.copy := Copy; method.draw := Draw;
method.selectable := Selectable; method.handle := Handle;
method.read := Read; method.write := Write; method.print := Print
END Rectangles.