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bresenham done

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jonathan santis 2024-10-24 09:28:12 +02:00
parent d712a7d8d4
commit 93ce68f527
1 changed files with 21 additions and 7 deletions
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28
main.zig
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@ -144,6 +144,8 @@ fn fillBuffer() !void {
_ = 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 = 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 bresenham(buffer, w, Point{ .x = 100, .y = 10, .z = 0 }, Point{ .x = 90, .y = 40, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 100, .y = 30, .z = 0 }, Point{ .x = 90, .y = 10, .z = 0 });
_ = try bresenham(buffer, w, Point{ .x = 100, .y = 30, .z = 0 }, Point{ .x = 60, .y = 10, .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 {
@ -162,12 +164,11 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
//var y: i32 = 0; //var y: i32 = 0;
const dx = (p2.x - p1.x); const dx = (p2.x - p1.x);
print("p2: {} - {},{}\n", .{ p2.y, p1.y, p2.y - p1.y }); print("p2: {} - {},{}\n", .{ p2.y, p1.y, p2.y - p1.y });
const dy: i64 = (p2.y - p1.y); const dy = (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 and dx > 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 });
_ = try pixel(buf, w, x, y, '.'); _ = try pixel(buf, w, x, y, '.');
er += dy; er += dy;
if (2 * er >= dx) { if (2 * er >= dx) {
@ -177,7 +178,6 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
} }
} else if (dx < dy and dy > 0 and dx > 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 });
_ = try pixel(buf, w, x, y, ','); _ = try pixel(buf, w, x, y, ',');
er += dx; er += dx;
if (2 * er >= dy) { if (2 * er >= dy) {
@ -187,7 +187,6 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
} }
} else if (@abs(dy) < dx and dy < 0 and dx > 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 });
_ = try pixel(buf, w, x, y, '🡇'); _ = try pixel(buf, w, x, y, '🡇');
er -= dy; er -= dy;
if (2 * er >= dx) { if (2 * er >= dx) {
@ -197,7 +196,6 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
} }
} else if (@abs(dy) > dx and dy < 0 and dx > 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 });
_ = try pixel(buf, w, x, y, '='); _ = try pixel(buf, w, x, y, '=');
er += dx; er += dx;
if (2 * er >= dy) { if (2 * er >= dy) {
@ -207,7 +205,6 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
} }
} else if (@abs(dx) <= dy and dx < 0 and dy > 0) { } else if (@abs(dx) <= dy and dx < 0 and dy > 0) {
while (y <= p2.y) : (y += 1) { 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'); _ = try pixel(buf, w, x, y, '5');
er += @abs(dx); er += @abs(dx);
if (2 * er >= dy) { if (2 * er >= dy) {
@ -217,7 +214,6 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
} }
} else if (@abs(dx) > dy and dy > 0 and dx < 0) { } else if (@abs(dx) > dy and dy > 0 and dx < 0) {
while (x >= p2.x) : (x -= 1) { 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'); _ = try pixel(buf, w, x, y, '6');
er += dy; er += dy;
if (2 * er >= @abs(dx)) { if (2 * er >= @abs(dx)) {
@ -225,6 +221,24 @@ fn bresenham(buf: []u8, w: Winsize, p1: Point, p2: Point) !void {
er -= @abs(dx); er -= @abs(dx);
} }
} }
} else if (dx <= dy and dx < 0 and dy < 0) {
while (x >= p2.x) : (x -= 1) {
_ = try pixel(buf, w, x, y, '7');
er += @abs(dy);
if (2 * er >= @abs(dx)) {
y -= 1;
er -= @abs(dx);
}
}
} else if (dx > dy and dy < 0 and dx < 0) {
while (y >= p2.y) : (y -= 1) {
_ = try pixel(buf, w, x, y, '8');
er += @abs(dx);
if (2 * er >= @abs(dx)) {
x -= 1;
er -= @abs(dx);
}
}
} }
} }