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);
}
public static Texture2D DrawLine(Vector2 from, Vector2 to, float w, Color col, Texture2D tex, bool stroke, Color strokeCol, float strokeWidth)
{
w = Mathf.Round(w);//It is important to round the numbers otherwise it will mess up with the texture width
strokeWidth = Mathf.Round(strokeWidth);
var extent = w + strokeWidth;
var stY = Mathf.Clamp(Mathf.Min(from.y, to.y) - extent, 0, tex.height);//This is the topmost Y value
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);//This is the rightmost Y value
strokeWidth = strokeWidth / 2;
var strokeInner = (w - strokeWidth) * (w - strokeWidth);
var strokeOuter = (w + strokeWidth) * (w + strokeWidth);
var strokeOuter2 = (w + strokeWidth + 1) * (w + strokeWidth + 1);
var sqrW = w * w;//It is much faster to calculate with squared values
var lengthX = endX - stX;
var lengthY = endY - stY;
var start = new Vector2(stX, stY);
Color[] pixels = tex.GetPixels((int)stX, (int)stY, (int)lengthX, (int)lengthY, 0);//Get all pixels
for (int y = 0; y < lengthY; y++)
{
for (int x = 0; x < lengthX; x++)
{//Loop through the pixels
var p = new Vector2(x, y) + start;
var center = p + new Vector2(0.5f, 0.5f);
float dist = (center - Mathfx.NearestPointStrict(from, to, center)).sqrMagnitude;//The squared distance from the center of the pixels to the nearest point on the line
if (dist <= strokeOuter2)
{
var samples = Sample(p);
var c = Color.black;
var pc = pixels[y * (int)lengthX + x];
for (int i = 0; i < samples.Length; i++)
{ //Loop through the samples
dist = (samples[i] - Mathfx.NearestPointStrict(from, to, samples[i])).sqrMagnitude; //The squared distance from the sample to the line
if (stroke)
{
if (dist <= strokeOuter && dist >= strokeInner)
{
c += strokeCol;
}
else if (dist < sqrW)
{
c += col;
}
else
{
c += pc;
}
}
else
{
if (dist < sqrW)
{//Is the distance smaller than the width of the line
c += col;
}
else
{
c += pc;//No it wasn't, set it to be the original colour
}
}
}
c /= samples.Length;//Get the avarage colour
pixels[y * (int)lengthX + x] = c;
}
}
}
tex.SetPixels((int)stX, (int)stY, (int)lengthX, (int)lengthY, pixels, 0);
tex.Apply();
return(tex);
}
