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u02: Implement DDA line tool

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This commit is contained in:
Simon Bruder 2023-05-06 17:39:18 +02:00
parent fab356c308
commit 708e501245
1 changed files with 58 additions and 0 deletions
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58
u02/src/tests.cpp
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@ -5,6 +5,8 @@
#include <catch2/generators/catch_generators_adapters.hpp>
#include <catch2/generators/catch_generators_random.hpp>
#include "canvas_buffer.h"
#include "dda_line_tool.h"
#include "util.h"
TEST_CASE("Transform Mirror") {
@ -102,3 +104,59 @@ TEST_CASE("Transformation to standard case (prop)") {
REQUIRE(x0 <= x1);
REQUIRE(y0 >= y1);
}
TEST_CASE("DDA line tool (prop: for every row/column, only one pixel is set)") {
const int size = 100;
canvas_buffer *canvas = new canvas_buffer(size, size);
dda_line_tool *tool = new dda_line_tool(*canvas);
int x0 = GENERATE(take(10, random(0, size - 1)));
int y0 = GENERATE(take(10, random(0, size - 1)));
int x1 = GENERATE(take(10, random(0, size - 1)));
int y1 = GENERATE(take(10, random(0, size - 1)));
tool->draw(x0, y0, x1, y1);
int x_min = std::min(x0, x1);
int x_max = std::max(x0, x1);
int y_min = std::min(y0, y1);
int y_max = std::max(y0, y1);
// Depending on what the direction of the line (rounded to the next 90°) is,
// either every row or column has only one pixel set.
bool vertical = false;
int draw_direction_min;
int draw_direction_max;
int unique_direction_min;
int unique_direction_max;
if (abs(y1 - y0) > abs(x1 - x0)) {
vertical = true;
draw_direction_min = y_min;
draw_direction_max = y_max;
unique_direction_min = x_min;
unique_direction_max = x_max;
} else {
draw_direction_min = x_min;
draw_direction_max = x_max;
unique_direction_min = y_min;
unique_direction_max = y_max;
}
int sum;
for (int dd = draw_direction_min; dd <= draw_direction_max; dd++) {
sum = 0;
for (int ud = unique_direction_min; ud <= unique_direction_max; ud++) {
int x, y;
if (vertical) {
x = ud;
y = dd;
} else {
x = dd;
y = ud;
}
if (canvas->get_pixel(x, y))
sum++;
}
REQUIRE(sum == 1);
}
}