Joystick Slider

[TYSON-Alii]

Hello,

Example Usage:

im::Begin("debug");
static float bg_scale = 100.f, b_scale = 15.f;
static vex2f v = 0.f;
joystick(v, bg_scale, b_scale);
im::DragFloat("bg scale", &bg_scale, 0.5, b_scale + 5, 500.f);
im::DragFloat("b scale", &b_scale, 0.5, 2, bg_scale - 5);
im::Text("%f, %f", v.x, v.y);
im::End();

C++

void JoystickSlider(float& _x, float& _y, float scale = 100.f, float b_scale = 15.f, uint bg_color = IM_COL32(0, 0, 0, 155), uint button_color = IM_COL32(215, 215, 215, 255), const uint& mouse_button = 0u) {
	namespace im = ImGui;
	ImDrawList* draw_list = im::GetWindowDrawList();
	const auto& p = im::GetCursorScreenPos();
	static bool button_clicked = false;
	const auto& mouse = im::GetIO().MousePos;
	draw_list->AddCircleFilled(ImVec2(p.x + scale, p.y + scale), scale, bg_color, 50);
	auto button_x = _x * (scale - b_scale) + p.x + scale;
	auto button_y = _y * (scale - b_scale) + p.y + scale;
	static float toward = 0.f;
	im::ButtonBehavior(ImRect({ button_x - b_scale, button_y - b_scale}, { button_x + b_scale, button_y + b_scale }), im::GetCurrentWindow()->ID, nullptr, nullptr, 0);
	if (sqrtf(pow(mouse.x - button_x, 2) + pow(mouse.y - button_y, 2)) < b_scale)
		if (im::GetIO().MouseClicked[mouse_button])
			button_clicked = true;
	if (!im::GetIO().MouseDown[mouse_button])
		button_clicked = false;
	if (button_clicked) {
		button_x = mouse.x;
		button_y = mouse.y;
	};
	toward = -atan2(button_x - p.x - scale, button_y - p.y - scale);
	if (sqrtf(pow(p.x - button_x + scale, 2) + pow(p.y - button_y + scale, 2)) > scale - b_scale) {
		button_x = p.x + scale + cos(toward - 0.5f * 3.14f) * -(scale-b_scale);
		button_y = p.y + scale + sin(toward - 0.5f * 3.14f) * -(scale-b_scale);
	};
	draw_list->AddCircleFilled(ImVec2(button_x, button_y), b_scale, button_color, 25);
	im::Dummy(ImVec2(scale*2, scale*2));
	_x = (button_x - p.x - scale) / (scale - b_scale);
	_y = (button_y - p.y - scale) / (scale - b_scale);
};

>=C++17

void JoystickSlider(auto& _vector2f, float scale = 100.f, float b_scale = 15.f, uint bg_color = IM_COL32(0, 0, 0, 155), uint button_color = IM_COL32(215, 215, 215, 255), const uint& mouse_button = 0u) {
	namespace im = ImGui;
	ImDrawList* draw_list = im::GetWindowDrawList();
	const auto& p = im::GetCursorScreenPos();
	static bool button_clicked = false;
	const auto& mouse = im::GetIO().MousePos;
	draw_list->AddCircleFilled(ImVec2(p.x + scale, p.y + scale), scale, bg_color, 50);
	auto button_x = _vector2f.x * (scale - b_scale) + p.x + scale;
	auto button_y = _vector2f.y * (scale - b_scale) + p.y + scale;
	static float toward = 0.f;
	im::ButtonBehavior(ImRect({ button_x - b_scale, button_y - b_scale}, { button_x + b_scale, button_y + b_scale }), im::GetCurrentWindow()->ID, nullptr, nullptr, 0);
	if (sqrtf(pow(mouse.x - button_x, 2) + pow(mouse.y - button_y, 2)) < b_scale)
		if (im::GetIO().MouseClicked[mouse_button])
			button_clicked = true;
	if (!im::GetIO().MouseDown[mouse_button])
		button_clicked = false;
	if (button_clicked) {
		button_x = mouse.x;
		button_y = mouse.y;
	};
	toward = -atan2(button_x - p.x - scale, button_y - p.y - scale);
	if (sqrtf(pow(p.x - button_x + scale, 2) + pow(p.y - button_y + scale, 2)) > scale - b_scale) {
		button_x = p.x + scale + cos(toward - 0.5f * 3.14f) * -(scale-b_scale);
		button_y = p.y + scale + sin(toward - 0.5f * 3.14f) * -(scale-b_scale);
	};
	draw_list->AddCircleFilled(ImVec2(button_x, button_y), b_scale, button_color, 25);
	im::Dummy(ImVec2(scale*2, scale*2));
	_vector2f.x = (button_x - p.x - scale) / (scale - b_scale);
	_vector2f.y = (button_y - p.y - scale) / (scale - b_scale);
};