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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#pragma once
#include <tuple>
#include "impeller/base/strings.h"
#include "impeller/geometry/color.h"
#include "impeller/geometry/point.h"
#include "third_party/imgui/imgui.h"
#define IMPELLER_PLAYGROUND_POINT(default_position, radius, color) \
({ \
static impeller::Point position = default_position; \
static impeller::Point reset_position = default_position; \
float radius_ = radius; \
impeller::Color color_ = color; \
\
static bool dragging = false; \
impeller::Point mouse_pos(ImGui::GetMousePos().x, ImGui::GetMousePos().y); \
static impeller::Point prev_mouse_pos = mouse_pos; \
\
if (ImGui::IsKeyPressed('R')) { \
position = reset_position; \
dragging = false; \
} \
\
bool hovering = position.GetDistance(mouse_pos) < radius_ && \
position.GetDistance(prev_mouse_pos) < radius_; \
if (!ImGui::IsMouseDown(0)) { \
dragging = false; \
} else if (hovering && ImGui::IsMouseClicked(0)) { \
dragging = true; \
} \
if (dragging) { \
position += mouse_pos - prev_mouse_pos; \
} \
ImGui::GetBackgroundDrawList()->AddCircleFilled( \
{position.x, position.y}, radius_, \
ImColor(color_.red, color_.green, color_.blue, \
(hovering || dragging) ? 0.6f : 0.3f)); \
if (hovering || dragging) { \
ImGui::GetBackgroundDrawList()->AddText( \
{position.x - radius_, position.y + radius_ + 10}, \
ImColor(color_.red, color.green, color.blue, 1.0f), \
impeller::SPrintF("x:%0.3f y:%0.3f", position.x, position.y) \
.c_str()); \
} \
prev_mouse_pos = mouse_pos; \
position; \
})
#define IMPELLER_PLAYGROUND_LINE(default_position_a, default_position_b, \
radius, color_a, color_b) \
({ \
impeller::Point position_a = default_position_a; \
impeller::Point position_b = default_position_b; \
float r_ = radius; \
impeller::Color color_a_ = color_a; \
impeller::Color color_b_ = color_b; \
\
position_a = IMPELLER_PLAYGROUND_POINT(position_a, r_, color_a_); \
position_b = IMPELLER_PLAYGROUND_POINT(position_b, r_, color_b_); \
\
auto dir = (position_b - position_a).Normalize() * r_; \
auto line_a = position_a + dir; \
auto line_b = position_b - dir; \
ImGui::GetBackgroundDrawList()->AddLine( \
{line_a.x, line_a.y}, {line_b.x, line_b.y}, \
ImColor(color_b.red, color_b.green, color_b.blue, 0.3f)); \
\
std::make_tuple(position_a, position_b); \
})