/// <summary>
/// Patterns the paint of texture.
/// </summary>
/// <returns>The paint.</returns>
/// <param name="from">From.</param>
/// <param name="to">To.</param>
/// <param name="rad">RAD.</param>
/// <param name="hardness">Hardness.</param>
/// <param name="tex">Tex.</param>
/// <param name="pattern">Pattern.</param>
public static Texture2D PatternPaint(Vector2 from, Vector2 to, float rad, float hardness, Texture2D tex, Texture2D pattern)
{
float extentX = (float)(pattern.width / 2);
float extentY = (float)(pattern.height / 2);
float stY = Mathf.Clamp(Mathf.Min(from.y, to.y) - extentY, 0, tex.height);
float stX = Mathf.Clamp(Mathf.Min(from.x, to.x) - extentX, 0, tex.width);
float endY = Mathf.Clamp(Mathf.Max(from.y, to.y) + extentY, 0, tex.height);
float endX = Mathf.Clamp(Mathf.Max(from.x, to.x) + extentX, 0, tex.width);
int lengthX = Mathf.RoundToInt(endX - stX);
int lengthY = Mathf.RoundToInt(endY - stY);
if (lengthX > pattern.width)
{
lengthX = pattern.width;
}
if (lengthY > pattern.height)
{
lengthY = pattern.height;
}
float sqrRad2 = (extentX + 1) * (extentY + 1);
Color[] pixels = tex.GetPixels((int)stX, (int)stY, (int)lengthX, (int)lengthY, 0);
Color[] patPixels = pattern.GetPixels(0, 0, lengthX, lengthY);
var start = new Vector2(stX, stY);
for (int y = 0; y < (int)lengthY; y++)
{
for (int x = 0; x < (int)lengthX; x++)
{
var p = new Vector2(x, y) + start;
var center = p + new Vector2(0.5f, 0.5f);
float dist = (center - PaintMathfx.NearestPointStrict(from, to, center)).sqrMagnitude;
if (dist > sqrRad2)
{
continue;
}
dist = PaintMathfx.GaussFalloff(Mathf.Sqrt(dist), rad) * hardness;
if (patPixels[y * (int)lengthX + x].a > 0.25f)
{
pixels[y * (int)lengthX + x] = patPixels[y * (int)lengthX + x];
}
}
}
tex.SetPixels((int)start.x, (int)start.y, (int)lengthX, (int)lengthY, pixels, 0);
return(tex);
}
/// <summary>
/// Paint the specified Texture with given color.
/// Can ignore alpha value, if alpha value is 0 then color wan't affect.
/// </summary>
/// <param name="from">Vector2 Start position.</param>
/// <param name="to">Vector2 End position.</param>
/// <param name="rad">float Radius area, brush size.</param>
/// <param name="col">Color to replace the texture with.</param>
/// <param name="hardness">float opacity of texture color.</param>
/// <param name="tex">Texture2D texture where color to be paint.</param>
/// <param name="ignoreAlpha">If set to <c>true</c> ignore the alpha 0 part.</param>
public static Texture2D Paint(Vector2 from, Vector2 to, float rad, Color col, float hardness, Texture2D tex, bool ignoreAlpha = true)
{
var extent = rad;
var stY = Mathf.Clamp(Mathf.Min(from.y, to.y) - extent, 0, tex.height);
var stX = Mathf.Clamp(Mathf.Min(from.x, to.x) - extent, 0, tex.width);
var endY = Mathf.Clamp(Mathf.Max(from.y, to.y) + extent, 0, tex.height);
var endX = Mathf.Clamp(Mathf.Max(from.x, to.x) + extent, 0, tex.width);
var lengthX = endX - stX;
var lengthY = endY - stY;
var sqrRad2 = (rad + 1) * (rad + 1);
Color[] pixels = tex.GetPixels((int)stX, (int)stY, (int)lengthX, (int)lengthY, 0);
var start = new Vector2(stX, stY);
for (int y = 0; y < (int)lengthY; y++)
{
for (int x = 0; x < (int)lengthX; x++)
{
var p = new Vector2(x, y) + start;
var center = p + new Vector2(0.5f, 0.5f);
float dist = (center - PaintMathfx.NearestPointStrict(from, to, center)).sqrMagnitude;
if (dist > sqrRad2)
{
continue;
}
dist = PaintMathfx.GaussFalloff(Mathf.Sqrt(dist), rad) * hardness;
Color c;
if (dist > 0)
{
c = Color.Lerp(pixels[y * (int)lengthX + x], col, dist);
}
else
{
c = pixels[y * (int)lengthX + x];
}
if (ignoreAlpha == false)
{
c.a = pixels[y * (int)lengthX + x].a;
}
pixels[y * (int)lengthX + x] = c;
}
}
tex.SetPixels((int)start.x, (int)start.y, (int)lengthX, (int)lengthY, pixels, 0);
return(tex);
}
