+
−unit uLandGraphics;
+
−interface
+
−
+
−type PRangeArray = ^TRangeArray;
+
−     TRangeArray = array[0..31] of record
+
−                                   Left, Right: integer;
+
−                                   end;
+
−
+
−procedure DrawExplosion(X, Y, Radius: integer);
+
−procedure DrawHLinesExplosions(ar: PRangeArray; Radius: integer; y, dY: integer; Count: Byte);
+
−procedure DrawTunnel(X, Y, dX, dY: Double; ticks, HalfWidth: integer);
+
−procedure FillRoundInLand(X, Y, Radius: integer; Value: Longword);
+
−
+
−implementation
+
−uses SDLh, uMisc, uLand, uConsts;
+
−
+
−procedure FillCircleLines(x, y, dx, dy: integer; Value: Longword);
+
−var i: integer;
+
−begin
+
−if ((y + dy) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dx, 0) to min(x + dx, 2047) do Land[y + dy, i]:= Value;
+
−if ((y - dy) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dx, 0) to min(x + dx, 2047) do Land[y - dy, i]:= Value;
+
−if ((y + dx) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dy, 0) to min(x + dy, 2047) do Land[y + dx, i]:= Value;
+
−if ((y - dx) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dy, 0) to min(x + dy, 2047) do Land[y - dx, i]:= Value;
+
−end;
+
−
+
−procedure FillRoundInLand(X, Y, Radius: integer; Value: Longword);
+
−var dx, dy, d: integer;
+
−begin
+
−  dx:= 0;
+
−  dy:= Radius;
+
−  d:= 3 - 2 * Radius;
+
−  while (dx < dy) do
+
−     begin
+
−     FillCircleLines(x, y, dx, dy, Value);
+
−     if (d < 0)
+
−     then d:= d + 4 * dx + 6
+
−     else begin
+
−          d:= d + 4 * (dx - dy) + 10;
+
−          dec(dy)
+
−          end;
+
−     inc(dx)
+
−     end;
+
−  if (dx = dy) then FillCircleLines(x, y, dx, dy, Value);
+
−end;
+
−
+
−procedure ClearLandPixel(y, x: integer);
+
−var p: PByteArray;
+
−begin
+
−p:= @PByteArray(LandSurface.pixels)^[LandSurface.pitch*y];
+
−case LandSurface.format.BytesPerPixel of
+
−     1: ;// not supported
+
−     2: PWord(@p[x * 2])^:= 0;
+
−     3: begin
+
−        p[x * 3 + 0]:= 0;
+
−        p[x * 3 + 1]:= 0;
+
−        p[x * 3 + 2]:= 0;
+
−        end;
+
−     4: PLongword(@p[x * 4])^:= 0;
+
−     end
+
−end;
+
−
+
−procedure SetLandPixel(y, x: integer);
+
−var p: PByteArray;
+
−begin
+
−p:= @PByteArray(LandSurface.pixels)^[LandSurface.pitch*y];
+
−case LandSurface.format.BytesPerPixel of
+
−     1: ;// not supported
+
−     2: PWord(@p[x * 2])^:= cExplosionBorderColor;
+
−     3: begin
+
−        p[x * 3 + 0]:= cExplosionBorderColor and $FF;
+
−        p[x * 3 + 1]:= (cExplosionBorderColor shr 8) and $FF;
+
−        p[x * 3 + 2]:= cExplosionBorderColor shr 16;
+
−        end;
+
−     4: PLongword(@p[x * 4])^:= cExplosionBorderColor;
+
−     end
+
−end;
+
−
+
−procedure FillLandCircleLines0(x, y, dx, dy: integer);
+
−var i: integer;
+
−begin
+
−if ((y + dy) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dx, 0) to min(x + dx, 2047) do ClearLandPixel(y + dy, i);
+
−if ((y - dy) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dx, 0) to min(x + dx, 2047) do ClearLandPixel(y - dy, i);
+
−if ((y + dx) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dy, 0) to min(x + dy, 2047) do ClearLandPixel(y + dx, i);
+
−if ((y - dx) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dy, 0) to min(x + dy, 2047) do ClearLandPixel(y - dx, i);
+
−end;
+
−
+
−procedure FillLandCircleLinesEBC(x, y, dx, dy: integer);
+
−var i: integer;
+
−begin
+
−if ((y + dy) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dx, 0) to min(x + dx, 2047) do
+
−       if Land[y + dy, i] = COLOR_LAND then SetLandPixel(y + dy, i);
+
−if ((y - dy) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dx, 0) to min(x + dx, 2047) do
+
−       if Land[y - dy, i] = COLOR_LAND then SetLandPixel(y - dy, i);
+
−if ((y + dx) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dy, 0) to min(x + dy, 2047) do
+
−       if Land[y + dx, i] = COLOR_LAND then SetLandPixel(y + dx, i);
+
−if ((y - dx) and $FFFFFC00) = 0 then
+
−   for i:= max(x - dy, 0) to min(x + dy, 2047) do
+
−       if Land[y - dx, i] = COLOR_LAND then SetLandPixel(y - dx, i);
+
−end;
+
−
+
−procedure DrawExplosion(X, Y, Radius: integer);
+
−var dx, dy, d: integer;
+
−begin
+
−FillRoundInLand(X, Y, Radius, 0);
+
−
+
−if SDL_MustLock(LandSurface) then
+
−   SDLTry(SDL_LockSurface(LandSurface) >= 0, true);
+
−
+
−  dx:= 0;
+
−  dy:= Radius;
+
−  d:= 3 - 2 * Radius;
+
−  while (dx < dy) do
+
−     begin
+
−     FillLandCircleLines0(x, y, dx, dy);
+
−     if (d < 0)
+
−     then d:= d + 4 * dx + 6
+
−     else begin
+
−          d:= d + 4 * (dx - dy) + 10;
+
−          dec(dy)
+
−          end;
+
−     inc(dx)
+
−     end;
+
−  if (dx = dy) then FillLandCircleLines0(x, y, dx, dy);
+
−  inc(Radius, 4);
+
−  dx:= 0;
+
−  dy:= Radius;
+
−  d:= 3 - 2 * Radius;
+
−  while (dx < dy) do
+
−     begin
+
−     FillLandCircleLinesEBC(x, y, dx, dy);
+
−     if (d < 0)
+
−     then d:= d + 4 * dx + 6
+
−     else begin
+
−          d:= d + 4 * (dx - dy) + 10;
+
−          dec(dy)
+
−          end;
+
−     inc(dx)
+
−     end;
+
−  if (dx = dy) then FillLandCircleLinesEBC(x, y, dx, dy);  
+
−  
+
−if SDL_MustLock(LandSurface) then
+
−   SDL_UnlockSurface(LandSurface);
+
−end;
+
−
+
−procedure DrawHLinesExplosions(ar: PRangeArray; Radius: integer; y, dY: integer; Count: Byte);
+
−var tx, ty, i: LongInt;
+
−begin
+
−if SDL_MustLock(LandSurface) then
+
−   SDL_LockSurface(LandSurface);
+
−
+
−for i:= 0 to Pred(Count) do
+
−    begin
+
−    for ty:= max(y - Radius, 0) to min(y + Radius, 1023) do
+
−        for tx:= max(0, ar[i].Left - Radius) to min(2047, ar[i].Right + Radius) do
+
−            ClearLandPixel(ty, tx);
+
−    inc(y, dY)
+
−    end;
+
−
+
−inc(Radius, 4);
+
−dec(y, Count*dY);
+
−
+
−for i:= 0 to Pred(Count) do
+
−    begin
+
−    for ty:= max(y - Radius, 0) to min(y + Radius, 1023) do
+
−        for tx:= max(0, ar[i].Left - Radius) to min(2047, ar[i].Right + Radius) do
+
−            if Land[ty, tx] = $FFFFFF then
+
−                  SetLandPixel(ty, tx);
+
−    inc(y, dY)
+
−    end;
+
−
+
−if SDL_MustLock(LandSurface) then
+
−   SDL_UnlockSurface(LandSurface);
+
−end;
+
−
+
−//
+
−//  - (dX, dY) - direction, vector of length = 0.5
+
−//
+
−procedure DrawTunnel(X, Y, dX, dY: Double; ticks, HalfWidth: integer);
+
−var nx, ny: Double;
+
−    i, t, tx, ty: Longint;
+
−begin  // (-dY, dX) is (dX, dY) rotated by PI/2
+
−if SDL_MustLock(LandSurface) then
+
−   SDL_LockSurface(LandSurface);
+
−
+
−nx:= X + dY * (HalfWidth + 8);
+
−ny:= Y - dX * (HalfWidth + 8);
+
−
+
−for i:= 0 to 7 do
+
−    begin
+
−    X:= nx - 8 * dX;
+
−    Y:= ny - 8 * dY;
+
−    for t:= -8 to ticks + 8 do
+
−        {$include tunsetborder.inc}
+
−    nx:= nx - dY;
+
−    ny:= ny + dX;
+
−    end;
+
−
+
−for i:= -HalfWidth to HalfWidth do
+
−    begin
+
−    X:= nx - dX * 8;
+
−    Y:= ny - dY * 8;
+
−    for t:= 0 to 7 do
+
−        {$include tunsetborder.inc}
+
−    X:= nx;
+
−    Y:= ny;
+
−    for t:= 0 to ticks do
+
−        begin
+
−        X:= X + dX;
+
−        Y:= Y + dY;
+
−        tx:= round(X);
+
−        ty:= round(Y);
+
−        if ((ty and $FFFFFC00) = 0) and ((tx and $FFFFF800) = 0) then
+
−           begin
+
−           Land[ty, tx]:= 0;
+
−           ClearLandPixel(ty, tx);
+
−           end
+
−        end;
+
−    for t:= 0 to 7 do
+
−        {$include tunsetborder.inc}
+
−    nx:= nx - dY;
+
−    ny:= ny + dX;
+
−    end;
+
−
+
−for i:= 0 to 7 do
+
−    begin
+
−    X:= nx - 8 * dX;
+
−    Y:= ny - 8 * dY;
+
−    for t:= -8 to ticks + 8 do
+
−        {$include tunsetborder.inc}
+
−    nx:= nx - dY;
+
−    ny:= ny + dX;
+
−    end;
+
−
+
−if SDL_MustLock(LandSurface) then
+
−   SDL_UnlockSurface(LandSurface)
+
−end;
+
−
+
−
+
−end.