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oct 5 and 6

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This commit is contained in:
jonathan santis 2024-10-24 08:57:37 +02:00
parent ae9afbc937
commit d712a7d8d4
1 changed files with 29 additions and 10 deletions
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39
main.zig
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@ -139,19 +139,18 @@ fn fillBuffer() !void {
_ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 12, .z = 0 }); _ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 12, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 28, .z = 0 }); _ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 28, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 30, .z = 0 }); _ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 30, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 40, .z = 0 }); _ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 39, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 30, .y = 30, .z = 0 }, Point{ .x = 60, .y = 10, .z = 0 }); _ = try bresenham(buffer, w, Point{ .x = 30, .y = 30, .z = 0 }, Point{ .x = 60, .y = 10, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 60, .y = 30, .z = 0 }, Point{ .x = 70, .y = 5, .z = 0 }); _ = try bresenham(buffer, w, Point{ .x = 60, .y = 30, .z = 0 }, Point{ .x = 70, .y = 5, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 100, .y = 20, .z = 0 }, Point{ .x = 30, .y = 30, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 100, .y = 10, .z = 0 }, Point{ .x = 90, .y = 40, .z = 0 });
try file.writeAll(buffer); try file.writeAll(buffer);
} }
fn pixel(buffer: []u8, w: Winsize, x: i64, y: i64, symbol: u21) !void { fn pixel(buffer: []u8, w: Winsize, x: i64, y: i64, symbol: u21) !void {
const i: usize = @intCast(4 * (x + y * w.ws_col)); const i: usize = @intCast(4 * (x + y * w.ws_col));
if (i < buffer.len) { if (i < buffer.len) {
const slice = buffer[i .. i + 4]; const slice = buffer[i .. i + 4];
print("slice:{u}\n", .{slice});
_ = try std.unicode.utf8Encode(symbol, slice); _ = try std.unicode.utf8Encode(symbol, slice);
print("slice after:{u}\n", .{slice});
print("cols{}\ni: {}\n", .{ w.ws_col, i });
} else { } else {
print("Error illegal memory access\n", .{}); print("Error illegal memory access\n", .{});
} }
@ -166,7 +165,7 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
const dy: i64 = (p2.y - p1.y); const dy: i64 = (p2.y - p1.y);
//const slope = dx/dy; //const slope = dx/dy;
var er: i64 = 0; var er: i64 = 0;
if (dx >= dy and dy > 0) { if (dx >= dy and dy > 0 and dx > 0) {
while (x <= p2.x) : (x += 1) { while (x <= p2.x) : (x += 1) {
print("[bresenham]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy }); print("[bresenham]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy });
_ = try pixel(buf, w, x, y, '.'); _ = try pixel(buf, w, x, y, '.');
@ -176,7 +175,7 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
er -= dx; er -= dx;
} }
} }
} else if (dx < dy and dy > 0) { } else if (dx < dy and dy > 0 and dx > 0) {
while (y <= p2.y) : (y += 1) { while (y <= p2.y) : (y += 1) {
print("[bresenham2]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy }); print("[bresenham2]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy });
_ = try pixel(buf, w, x, y, ','); _ = try pixel(buf, w, x, y, ',');
@ -186,26 +185,46 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
er -= dy; er -= dy;
} }
} }
} else if (@abs(dy) < dx and dy < 0) { } else if (@abs(dy) < dx and dy < 0 and dx > 0) {
while (x <= p2.x) : (x += 1) { while (x <= p2.x) : (x += 1) {
print("[bresenham3]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy }); print("[bresenham3]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy });
_ = try pixel(buf, w, x, y, 'x'); _ = try pixel(buf, w, x, y, '🡇');
er -= dy; er -= dy;
if (2 * er >= dx) { if (2 * er >= dx) {
y -= 1; y -= 1;
er -= dx; er -= dx;
} }
} }
} else if (@abs(dy) > dx and dy < 0) { } else if (@abs(dy) > dx and dy < 0 and dx > 0) {
while (y >= p2.y) : (y -= 1) { while (y >= p2.y) : (y -= 1) {
print("[bresenham4]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy }); print("[bresenham4]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy });
_ = try pixel(buf, w, x, y, '4'); _ = try pixel(buf, w, x, y, '=');
er += dx; er += dx;
if (2 * er >= dy) { if (2 * er >= dy) {
x += 1; x += 1;
er += dy; er += dy;
} }
} }
} else if (@abs(dx) <= dy and dx < 0 and dy > 0) {
while (y <= p2.y) : (y += 1) {
print("[bresenham5]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy });
_ = try pixel(buf, w, x, y, '5');
er += @abs(dx);
if (2 * er >= dy) {
x -= 1;
er -= dy;
}
}
} else if (@abs(dx) > dy and dy > 0 and dx < 0) {
while (x >= p2.x) : (x -= 1) {
print("[bresenham6]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy });
_ = try pixel(buf, w, x, y, '6');
er += dy;
if (2 * er >= @abs(dx)) {
y += 1;
er -= @abs(dx);
}
}
} }
} }