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.