1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
// Code referred from
// https://iq.opengenus.org/bresenham-line-drawining-algorithm/
#include "cru/platform/Color.hpp"
#include "cru/platform/bootstrap/Bootstrap.hpp"
#include "cru/platform/graphics/Factory.hpp"
#include "cru/platform/graphics/Painter.hpp"
#include "cru/platform/gui/UiApplication.hpp"
#include "cru/platform/gui/Window.hpp"
#include <functional>
void BresenhamDrawLine(int x1, int y1, int x2, int y2,
const std::function<void(int, int)>& draw_pixel) {
// calculating range for line between start and end point
int dx = x2 - x1;
int dy = y2 - y1;
int x = x1;
int y = y1;
// this is the case when slope(m) < 1
if (abs(dx) > abs(dy)) {
draw_pixel(x, y); // this putpixel is for very first pixel of the line
int pk = (2 * abs(dy)) - abs(dx);
for (int i = 0; i < abs(dx); i++) {
x = x + 1;
if (pk < 0)
pk = pk + (2 * abs(dy));
else {
y = y + 1;
pk = pk + (2 * abs(dy)) - (2 * abs(dx));
}
draw_pixel(x, y);
}
} else {
// this is the case when slope is greater than or equal to 1 i.e: m>=1
draw_pixel(x, y); // this putpixel is for very first pixel of the line
int pk = (2 * abs(dx)) - abs(dy);
for (int i = 0; i < abs(dy); i++) {
y = y + 1;
if (pk < 0)
pk = pk + (2 * abs(dx));
else {
x = x + 1;
pk = pk + (2 * abs(dx)) - (2 * abs(dy));
}
draw_pixel(x, y); // display pixel at coordinate (x, y)
}
}
}
int main() {
auto application = cru::platform::bootstrap::CreateUiApplication();
auto window = application->CreateWindow();
auto brush = application->GetGraphicsFactory()->CreateSolidColorBrush(
cru::platform::colors::black);
window->SetClientSize(cru::platform::Size(400, 200));
window->PaintEvent()->AddHandler([window, &brush](nullptr_t) {
auto painter = window->BeginPaint();
auto draw_pixel = [&painter, &brush](int x, int y) {
painter->FillRectangle({static_cast<float>(x) - 0.5f,
static_cast<float>(y) - 0.5f, 1.0f, 1.0f},
brush.get());
};
BresenhamDrawLine(50, 50, 100, 200, draw_pixel);
BresenhamDrawLine(50, 50, 200, 100, draw_pixel);
});
window->SetVisibility(cru::platform::gui::WindowVisibilityType::Show);
return application->Run();
}
|
