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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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56
main.zig
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@ -17,9 +17,9 @@ const Winsize = struct {
ws_ypixel: c_ushort = 0,
};
const Point = struct {
x: u32,
y: u32,
z: u32,
x: i32,
y: i32,
z: i32,
};
const Vec3 = struct {
a: Point,
@ -136,11 +136,11 @@ fn fillBuffer() !void {
};
_ = 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);
}
fn pixel(buffer: []u8, w: Winsize, x: u64, y: u64, symbol: u21) !void {
const i = 4 * (x + y * w.ws_col);
fn pixel(buffer: []u8, w: Winsize, x: i64, y: i64, symbol: u21) !void {
const i: usize = @intCast(4 * (x + y * w.ws_col));
if (i < buffer.len) {
const slice = buffer[i .. i + 4];
print("slice:{u}\n", .{slice});
@ -152,37 +152,35 @@ fn pixel(buffer: []u8, w: Winsize, x: u64, y: u64, symbol: u21) !void {
}
}
fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
var x: u64 = p1.x;
var y: u64 = p1.y;
const x1: i32 = p1.x;
const y1: i32 = p1.y;
var x: i32 = 0;
var y: i32 = 0;
const dx = (p2.x - p1.x);
const a: u32 = 20;
const b: u32 = 40;
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));
print("p2: {} - {},{}\n", .{ p2.y, p1.y, p2.y - p1.y });
const dy: i64 = (p2.y - p1.y);
//const slope = dx/dy;
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) {
print("[bresenham]x:{},y:{},er:{},dx:{},dy:{}\n", .{ x, y, er, dx, dy });
_ = try pixel(buf, w, x, y, '.');
if (dy > 0) {
er += dy;
if (2 * er >= dx) {
y += 1;
er -= dx;
}
} else if (dy < 0) {
er -= dy;
if (2 * er >= dx) {
y -= 1;
er += dx;
}
er += dy;
if (2 * er >= dx) {
y += 1;
er -= dx;
}
}
dy = 0;
}
//fn triangle(vec: Vec3) void {