public static Texture2D Paint(Vector2 pos, float rad, Color col, float hardness, Texture2D tex)
{
var start = new Vector2(Mathf.Clamp(pos.x - rad, 0, tex.width), Mathf.Clamp(pos.y - rad, 0, tex.height));
//var width = rad * 2;
var end = new Vector2(Mathf.Clamp(pos.x + rad, 0, tex.width), Mathf.Clamp(pos.y + rad, 0, tex.height));
var widthX = Mathf.Round(end.x - start.x);
var widthY = Mathf.Round(end.y - start.y);
//var sqrRad = rad * rad;
var sqrRad2 = (rad + 1) * (rad + 1);
Color[] pixels = tex.GetPixels((int)start.x, (int)start.y, (int)widthX, (int)widthY, 0);
for (var y = 0; y < widthY; y++)
{
for (var x = 0; x < widthX; x++)
{
var p = new Vector2(x, y) + start;
var center = p + new Vector2(0.5f, 0.5f);
float dist = (center - pos).sqrMagnitude;
if (dist > sqrRad2)
{
continue;
}
var samples = Sample(p);
var c = Color.black;
for (var i = 0; i < samples.Length; i++)
{
dist = Mathfx.GaussFalloff(Vector2.Distance(samples[i], pos), rad) * hardness;
if (dist > 0)
{
c += Color.Lerp(pixels[y * (int)widthX + x], col, dist);
}
else
{
c += pixels[y * (int)widthX + x];
}
}
c /= samples.Length;
pixels[y * (int)widthX + x] = c;
}
}
tex.SetPixels((int)start.x, (int)start.y, (int)widthX, (int)widthY, pixels, 0);
return(tex);
}
public static void PaintLine(Stroke stroke, ref Texture2D tex)
{
//var width = stroke.width * 2;
var extent = stroke.width;
var stY = Mathf.Clamp(Mathf.Min(stroke.start.y, stroke.end.y) - extent, 0, tex.height);
var stX = Mathf.Clamp(Mathf.Min(stroke.start.x, stroke.end.x) - extent, 0, tex.width);
var endY = Mathf.Clamp(Mathf.Max(stroke.start.y, stroke.end.y) + extent, 0, tex.height);
var endX = Mathf.Clamp(Mathf.Max(stroke.start.x, stroke.end.x) + extent, 0, tex.width);
var lengthX = endX - stX;
var lengthY = endY - stY;
//var sqrRad = stroke.width * stroke.width;
var sqrRad2 = (stroke.width + 1) * (stroke.width + 1);
var start = new Vector2(stX, stY);
Vector2 p = new Vector2();
Vector2 center = new Vector2();
float dist;
for (int y = 0; y < (int)lengthY; y++)
{
for (int x = 0; x < (int)lengthX; x++)
{
p.Set(x, y);
p += start;
center = p + Vector2.one * 0.5f;
dist = (center - Mathfx.NearestPointStrict(stroke.start, stroke.end, center)).sqrMagnitude;
if (dist > sqrRad2)
{
continue;
}
dist = Mathfx.GaussFalloff(Mathf.Sqrt(dist), stroke.width) * stroke.hardness;
if (dist > 0)
{
tex.SetPixel(x + (int)stX, y + (int)stY, stroke.color);
}
}
}
tex.Apply(false);
}
