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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.
#include "impeller/playground/widgets.h"
namespace impeller {
Point DrawPlaygroundPoint(PlaygroundPoint& point) {
if (ImGui::GetCurrentContext()) {
impeller::Point mouse_pos(ImGui::GetMousePos().x, ImGui::GetMousePos().y);
if (!point.prev_mouse_pos.has_value()) {
point.prev_mouse_pos = mouse_pos;
}
if (ImGui::IsKeyPressed(ImGuiKey_R)) {
point.position = point.reset_position;
point.dragging = false;
}
bool hovering =
point.position.GetDistance(mouse_pos) < point.radius &&
point.position.GetDistance(point.prev_mouse_pos.value()) < point.radius;
if (!ImGui::IsMouseDown(0)) {
point.dragging = false;
} else if (hovering && ImGui::IsMouseClicked(0)) {
point.dragging = true;
}
if (point.dragging) {
point.position += mouse_pos - point.prev_mouse_pos.value();
}
ImGui::GetBackgroundDrawList()->AddCircleFilled(
{point.position.x, point.position.y}, point.radius,
ImColor(point.color.red, point.color.green, point.color.blue,
(hovering || point.dragging) ? 0.6f : 0.3f));
if (hovering || point.dragging) {
ImGui::GetBackgroundDrawList()->AddText(
{point.position.x - point.radius,
point.position.y + point.radius + 10},
ImColor(point.color.red, point.color.green, point.color.blue, 1.0f),
impeller::SPrintF("x:%0.3f y:%0.3f", point.position.x,
point.position.y)
.c_str());
}
point.prev_mouse_pos = mouse_pos;
}
return point.position;
}
std::tuple<Point, Point> DrawPlaygroundLine(PlaygroundPoint& point_a,
PlaygroundPoint& point_b) {
Point position_a = DrawPlaygroundPoint(point_a);
Point position_b = DrawPlaygroundPoint(point_b);
if (ImGui::GetCurrentContext()) {
auto dir = (position_b - position_a).Normalize() * point_a.radius;
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(point_b.color.red, point_b.color.green, point_b.color.blue,
0.3f));
}
return std::make_tuple(position_a, position_b);
}
//
} // namespace impeller