public static int MINIMUM_THRESHOLD = -333; //!< Minimum threshold.
/// Minimum alpha a point must have to be rendered at all.
///
//Inputs: speedAndPos | the dictionary that stores all the points and their different color values
// cam | the main camera
// plane | the heatplane that the texture is going to be put on
//Outputs: Texture2D | the texture that the heatmap is put on
//Functionality: creates a texture for the heatmap to be stored on using all the points and their color values
public static Texture2D CreateHeatmap(Dictionary <Vector2, float> speedAndPos, Camera cam, GameObject plane)
{
//find camera
if (cam == null)
{
if (Camera.main == null)
{
Debug.LogWarning("No camera found. Returning an empty texture.");
return(new Texture2D(0, 0));
}
else
{
cam = Camera.main;
}
}
// Create new texture
Texture2D map = new Texture2D((int)(plane.transform.localScale.x * 30 * 10), (int)(plane.transform.localScale.z * 30 * 10), TextureFormat.ARGB32, false);
// Set texture to alpha-fied state
map.SetPixels(Heatmap.ColorArray(new Color(1f, 1f, 1f, 0f), map.width * map.height), 0);
//Going through each point, set the alpha value to the color value in speedAndPos
foreach (KeyValuePair <Vector2, float> keyval in speedAndPos)
{
//this checks if the color value is 0, in which case the color should be different. This represents the starting position of the agent
//this is currently turned off in Tracker
if (keyval.Value == 0)
{
map.SetPixel((int)keyval.Key.x, (int)keyval.Key.y, Color.cyan);
}
else
{
map.SetPixel((int)keyval.Key.x, (int)keyval.Key.y, new Color(1f, 1f, 1f, keyval.Value));
}
}
//finish the map by applying all changes and setting the rest of the pixels
map.Apply();
map.SetPixels(Colorize(map.GetPixels(0)), 0);
map.Apply();
return(map);
}
public static int MINIMUM_THRESHOLD = 100; //!< Minimum threshold.
/// Minimum alpha a point must have to be rendered at all.
/*! <summary>
* Creates a Heatmap image given a set of world points.
* </summary>
* <remarks>
* This method accepts a series of world points, and returns a transparent overlay of the heatmap. Usually you will want to pair this call with CreateRenderPlane() to actually view the heatmap.
* </remarks>
* <param name="worldPoints">An array of Vector3 points to be translated into heatmap points.</param>
* <param name="cam">The camera to render from. If passed a null value, CreateHeatmap() attempts to use Camera.main.</param>
* <param name="radius">Raidus in pixels that each point should create. Larger radii produce denser heatmaps, and vice-versa.</param>
* <returns>Returns a new Texture2D containing a transparent overlay of the heatmap.</returns>
*/
public static Texture2D CreateHeatmap(Vector3[] worldPoints, Camera cam, int radius)
{
if (cam == null)
{
if (Camera.main == null)
{
Debug.LogWarning("No camera found. Returning an empty texture.");
return(new Texture2D(0, 0));
}
else
{
cam = Camera.main;
}
}
// Create new texture
// Texture2D map = new Texture2D(Screen.width, Screen.height, TextureFormat.ARGB32, false);
Texture2D map = new Texture2D((int)cam.pixelWidth, (int)cam.pixelHeight, TextureFormat.ARGB32, false);
// Set texture to alpha-fied state
map.SetPixels(Heatmap.ColorArray(new Color(1f, 1f, 1f, 0f), map.width * map.height), 0);
// Convert world to screen points
Vector2[] points = new Vector2[worldPoints.Length];
for (int i = 0; i < worldPoints.Length; i++)
{
points[i] = cam.WorldToScreenPoint(worldPoints[i]);
}
/*** Generate Grayscale Values ***/
{
int x2; // the offset x val in img coordinates
int y2; // the offset y val in img coordinates (0,0) - (maxX, maxY)
float pointAlpha = .9f; // The alpha that the darkest pixel will be in a poitn.
Color color = new Color(1f, 1f, 1f, pointAlpha);
int lineWidth = 1; //(int)(radius * .05f);
Dictionary <Vector2, Color> pixelAlpha = new Dictionary <Vector2, Color>();
for (int i = 0; i < points.Length; i++) // generate alpha add for each point and a specified circumference
{
pixelAlpha.Clear();
for (int r = 0; r < radius; r += lineWidth) // draw and fill them circles
{
for (int angle = 0; angle < 360; angle++)
{
x2 = (int)(r * Mathf.Cos(angle)) + (int)points[i].x;
y2 = (int)(r * Mathf.Sin(angle)) + (int)points[i].y;
// This could be sped up
for (int y = y2; y > y2 - lineWidth; y--)
{
for (int x = x2; x < x2 + lineWidth; x++)
{
Vector2 coord = new Vector2(x, y);
if (pixelAlpha.ContainsKey(coord))
{
pixelAlpha[coord] = color;
}
else
{
pixelAlpha.Add(new Vector2(x, y), color);
}
}
}
}
color = new Color(color.r, color.g, color.b, color.a - (pointAlpha / ((float)radius / lineWidth)));
}
// Since the radial fill code overwrites it's own pixels, make sure to only add finalized alpha to
// old values.
foreach (KeyValuePair <Vector2, Color> keyval in pixelAlpha)
{
Vector2 coord = keyval.Key;
Color previousColor = map.GetPixel((int)coord.x, (int)coord.y);
Color newColor = keyval.Value;
map.SetPixel((int)coord.x, (int)coord.y, new Color(newColor.r, newColor.b, newColor.g, newColor.a + previousColor.a));
}
// Reset color for next point
color = new Color(color.r, color.g, color.b, pointAlpha);
}
}
map.Apply();
map.SetPixels(Colorize(map.GetPixels(0)), 0);
map.Apply();
return(map);
}
