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This commit is contained in:
jonathan santis 2024-10-22 14:57:57 +02:00
parent a58b6ca567
commit 4987faed56
1 changed files with 27 additions and 29 deletions
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48
main.zig
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@ -17,9 +17,9 @@ const Winsize = struct {
ws_ypixel: c_ushort = 0, ws_ypixel: c_ushort = 0,
}; };
const Point = struct { const Point = struct {
x: u32, x: i32,
y: u32, y: i32,
z: u32, z: i32,
}; };
const Vec3 = struct { const Vec3 = struct {
a: Point, a: Point,
@ -136,11 +136,11 @@ fn fillBuffer() !void {
}; };
_ = vec; _ = vec;
//triangle(vec); //triangle(vec);
_ = try bresenham(buffer, w, Point{ .x = 10, .y = 40, .z = 0 }, Point{ .x = 100, .y = 20, .z = 0 }); _ = try bresenham(buffer, w, Point{ .x = 10, .y = 40, .z = 0 }, Point{ .x = 30, .y = 10, .z = 0 });
try file.writeAll(buffer); try file.writeAll(buffer);
} }
fn pixel(buffer: []u8, w: Winsize, x: u64, y: u64, symbol: u21) !void { fn pixel(buffer: []u8, w: Winsize, x: i64, y: i64, symbol: u21) !void {
const i = 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}); print("slice:{u}\n", .{slice});
@ -152,38 +152,36 @@ fn pixel(buffer: []u8, w: Winsize, x: u64, y: u64, symbol: u21) !void {
} }
} }
fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void { fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
var x: u64 = p1.x; const x1: i32 = p1.x;
var y: u64 = p1.y; const y1: i32 = p1.y;
var x: i32 = 0;
var y: i32 = 0;
const dx = (p2.x - p1.x); const dx = (p2.x - p1.x);
const a: u32 = 20; print("p2: {} - {},{}\n", .{ p2.y, p1.y, p2.y - p1.y });
const b: u32 = 40; const dy: i64 = (p2.y - p1.y);
var c1: i64 = 0;
c1 = a - b;
print("c:{}\n", .{c1});
print("p2: {} - {},{}", .{ p2.y, p1.y, p2.y - p1.y });
var dy: i64 = ((p2.y) - (p1.y));
//const slope = dx/dy; //const slope = dx/dy;
var er: i64 = 0; var er: i64 = 0;
if (dy > 0 and dy <= dx) {
x = x1;
y = y1;
}
if (dy < 0 and @abs(dy) > dx) {
print("octant2\n", .{});
x = y1;
y = x1;
}
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, '.');
if (dy > 0) {
er += dy; er += dy;
if (2 * er >= dx) { if (2 * er >= dx) {
y += 1; y += 1;
er -= dx; er -= dx;
} }
} else if (dy < 0) {
er -= dy;
if (2 * er >= dx) {
y -= 1;
er += dx;
} }
} }
}
dy = 0;
}
//fn triangle(vec: Vec3) void { //fn triangle(vec: Vec3) void {