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Add quad drawing utilities

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This commit is contained in:
Abdelrahman Said
2024-01-21 01:20:00 +00:00
parent fa82203681
commit 6df11cfdeb
2 changed files with 33 additions and 3 deletions
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10
include/window.h
View File

@@ -10,6 +10,7 @@
typedef struct point point_t; typedef struct point point_t;
typedef struct line line_t; typedef struct line line_t;
typedef struct triangle triangle_t; typedef struct triangle triangle_t;
typedef struct gquad gquad_t;
typedef struct rect rect_t; typedef struct rect rect_t;
typedef struct window window_t; typedef struct window window_t;
@@ -29,6 +30,13 @@ struct triangle {
point_t p2; point_t p2;
}; };
struct gquad {
point_t p0;
point_t p1;
point_t p2;
point_t p3;
};
struct rect { struct rect {
point_t topleft; point_t topleft;
i32 w; i32 w;
@@ -63,6 +71,8 @@ void draw_point(const window_t *wnd, point_t p, colour_t colour);
void draw_line(const window_t *wnd, const line_t *ln, colour_t colour); void draw_line(const window_t *wnd, const line_t *ln, colour_t colour);
void draw_triangle(const window_t *wnd, triangle_t triangle, colour_t colour); void draw_triangle(const window_t *wnd, triangle_t triangle, colour_t colour);
void fill_triangle(const window_t *wnd, triangle_t triangle, colour_t colour); void fill_triangle(const window_t *wnd, triangle_t triangle, colour_t colour);
void draw_gquad(const window_t *wnd, gquad_t gquad, colour_t colour);
void fill_gquad(const window_t *wnd, gquad_t gquad, colour_t colour);
void draw_rect(const window_t *wnd, rect_t rect, colour_t colour); void draw_rect(const window_t *wnd, rect_t rect, colour_t colour);
void fill_rect(const window_t *wnd, rect_t rect, colour_t colour); void fill_rect(const window_t *wnd, rect_t rect, colour_t colour);

26
src/window.c
View File

@@ -122,15 +122,35 @@ void fill_triangle(const window_t *wnd, triangle_t triangle, colour_t colour) {
for (i32 y = min_y; y < max_y; ++y) { for (i32 y = min_y; y < max_y; ++y) {
for (i32 x = min_x; x < max_x; ++x) { for (i32 x = min_x; x < max_x; ++x) {
if (half_space(x2, x1, y2, y1, x, y) > 0 && if (half_space(x2, x1, y2, y1, x, y) >= 0 &&
half_space(x3, x2, y3, y2, x, y) > 0 && half_space(x3, x2, y3, y2, x, y) >= 0 &&
half_space(x1, x3, y1, y3, x, y) > 0) { half_space(x1, x3, y1, y3, x, y) >= 0) {
draw_point(wnd, (point_t){x, y}, colour); draw_point(wnd, (point_t){x, y}, colour);
} }
} }
} }
} }
void draw_gquad(const window_t *wnd, gquad_t gquad, colour_t colour) {
line_t l0 = (line_t){gquad.p0, gquad.p1};
line_t l1 = (line_t){gquad.p1, gquad.p3};
line_t l2 = (line_t){gquad.p3, gquad.p2};
line_t l3 = (line_t){gquad.p2, gquad.p0};
draw_line(wnd, &l0, colour);
draw_line(wnd, &l1, colour);
draw_line(wnd, &l2, colour);
draw_line(wnd, &l3, colour);
}
void fill_gquad(const window_t *wnd, gquad_t gquad, colour_t colour) {
triangle_t t0 = (triangle_t){gquad.p3, gquad.p1, gquad.p0};
triangle_t t1 = (triangle_t){gquad.p0, gquad.p2, gquad.p3};
fill_triangle(wnd, t0, colour);
fill_triangle(wnd, t1, colour);
}
void draw_rect(const window_t *wnd, rect_t rect, colour_t colour) { void draw_rect(const window_t *wnd, rect_t rect, colour_t colour) {
set_colour(wnd, colour); set_colour(wnd, colour);