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Gradient.cs
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Gradient.cs
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using ImGuiNET;
using OpenTK.Audio.OpenAL;
using OpenTK.Mathematics;
using OpenTK.Windowing.Desktop;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
namespace NitricEngine2D
{
public class GradientStep
{
public Color4 colour;
public float position;
public void SetPosition(float x)
{
position = MathHelper.Clamp(x, 0f, 1f);
}
}
public class Gradient
{
public List<GradientStep> steps;
GradientStep editor_selection;
public enum INTERPOLATION_TYPE
{
LINEAR,
CONSTANT
}
public INTERPOLATION_TYPE interpolation;
public Gradient()
{
steps = new List<GradientStep>();
}
public Gradient(JsonElement data)
{
string interp = Helper.JSONGetPropertyString(data, "interpolation", "linear");
interpolation = (interp == "linear")? INTERPOLATION_TYPE.LINEAR : INTERPOLATION_TYPE.CONSTANT;
JsonElement stepArr;
steps = new List<GradientStep>();
if(data.TryGetProperty("steps", out stepArr))
{
foreach(JsonElement step in stepArr.EnumerateArray())
{
steps.Add(new GradientStep() { colour = Helper.JSONGetPropertyColour(step, "col", Color4.Black), position = Helper.JSONGetPropertyFloat(step, "pos", 0f) });
}
}
}
public static Gradient GetDefault()
{
Gradient g = new Gradient();
g.interpolation = INTERPOLATION_TYPE.LINEAR;
g.steps.Add(new GradientStep() { colour = Color4.White, position = 0f });
g.steps.Add(new GradientStep() { colour = Color4.White, position = 1f });
return g;
}
public Color4 SampleAt(float x)
{
if (x < 0f || x > 1f) return Color4.Black;
List<GradientStep> sortedSteps = steps.OrderBy(o => o.position).ToList();
GradientStep l = sortedSteps[0], r = sortedSteps[sortedSteps.Count - 1];
for(int i = 0; i < sortedSteps.Count; i++)
{
if (sortedSteps[i].position <= x)
{
l = sortedSteps[i];
if(i + 1 < sortedSteps.Count)
{
r = sortedSteps[i + 1];
}
else
{
r = sortedSteps[i];
}
}
}
if(interpolation == INTERPOLATION_TYPE.LINEAR)
{
if (l == null || r == null) return Color4.Black;
return Helper.LerpColor(l.colour, r.colour, (x - l.position) / (r.position - l.position));
}
else
{
if (l == null) return Color4.Black;
return l.colour;
}
}
public void ExposeToInspector()
{
ImGui.Text("interpolation: ");
ImGui.SameLine();
if(ImGui.Button(interpolation == INTERPOLATION_TYPE.LINEAR ? "linear" : "constant"))
{
interpolation = (interpolation == INTERPOLATION_TYPE.LINEAR) ? INTERPOLATION_TYPE.CONSTANT : INTERPOLATION_TYPE.LINEAR;
}
ImGui.Text("Left click to select steps\nright click and drag to move");
ImDrawListPtr drawList = ImGui.GetWindowDrawList();
System.Numerics.Vector2 bar_pos = ImGui.GetCursorScreenPos();
System.Numerics.Vector2 bar_size = new System.Numerics.Vector2(200, 50);
List<GradientStep> sortedSteps = steps.OrderBy(o => o.position).ToList();
for (int i = 0; i < sortedSteps.Count - 1; i++)
{
GradientStep step = sortedSteps[i];
GradientStep next = sortedSteps[i + 1];
System.Numerics.Vector2 start = new System.Numerics.Vector2(bar_pos.X + bar_size.X * step.position, bar_pos.Y);
System.Numerics.Vector2 end = new System.Numerics.Vector2(bar_pos.X + bar_size.X * next.position, bar_pos.Y + bar_size.Y);
uint col1 = Helper.Color4ToImguiColour(step.colour);
uint col2 = Helper.Color4ToImguiColour(next.colour);
if(interpolation == INTERPOLATION_TYPE.LINEAR)
{
drawList.AddRectFilledMultiColor(start, end, col1, col2, col2, col1);
}
else
{
drawList.AddRectFilledMultiColor(start, end, col1, col1, col1, col1);
}
}
drawList.AddRect(bar_pos, bar_pos + bar_size, Helper.Color4ToImguiColour(Color4.LightGray));
//draw markers
for(int i = 0; i < sortedSteps.Count; i++)
{
GradientStep step = sortedSteps[i];
System.Numerics.Vector2 circlePos = bar_pos + new System.Numerics.Vector2(bar_size.X * step.position, bar_size.Y);
drawList.AddCircleFilled(circlePos, 10f, Helper.Color4ToImguiColour(step.colour));
drawList.AddCircle(circlePos, 10f, Helper.Color4ToImguiColour((step == editor_selection)? Color4.White: Color4.Black));
}
if (ImGui.IsMouseClicked(ImGuiMouseButton.Left))
{
float x = (ImGui.GetMousePos().X - bar_pos.X) / bar_size.X;
if (x >= 0f && x <= 1f && ImGui.GetMousePos().Y > bar_pos.Y && ImGui.GetMousePos().Y < bar_pos.Y + bar_size.Y + 10f)
{
editor_selection = null;
foreach (GradientStep step in steps)
{
if (MathF.Abs(step.position - x) < 0.05f)
{
editor_selection = step;
break;
}
}
if (editor_selection == null)
{
GradientStep newStep = new GradientStep() { colour = SampleAt(x), position = x };
steps.Add(newStep);
editor_selection = newStep;
}
}
}
if (ImGui.IsMouseDown(ImGuiMouseButton.Right))
{
float x = (ImGui.GetMousePos().X - bar_pos.X) / bar_size.X;
if (x >= 0f && x <= 1f && ImGui.GetMousePos().Y > bar_pos.Y && ImGui.GetMousePos().Y < bar_pos.Y + bar_size.Y + 10f)
{
if(editor_selection != null)
{
editor_selection.position = x;
}
}
}
ImGui.SetCursorScreenPos(bar_pos + bar_size);
ImGui.NewLine();
if (editor_selection == null)
{
ImGui.Text("No step selected!");
}
else
{
editor_selection.colour = Helper.ImguiColourEdit4("step colour", editor_selection.colour);
if(ImGui.Button("delete step") && steps.Count > 1)
{
steps.Remove(editor_selection);
editor_selection = null;
}
}
}
}
}