public ImagePolygon(ImageEdge e) {
orderedEdges = new ArrayList();
orderedEdges.Add(e);
}
public bool AddEdge(ImageEdge e) {
// Check if the edge connects the previous edge
ImagePoint lastPoint = ((ImageEdge)orderedEdges[orderedEdges.Count-1]).v2;
// Make sure the points are ordered correctly
if (e.v1 == lastPoint) {
orderedEdges.Add(e);
return true;
} else if (e.v2 == lastPoint) {
e.Reverse();
orderedEdges.Add(e);
return true;
}
// Otherwise, Check if it shares with the first edge
ImagePoint firstPoint = ((ImageEdge)orderedEdges[0]).v1;
if (e.v2 == firstPoint) {
orderedEdges.Insert(0,e);
return true;
} else if (e.v1 == firstPoint) {
e.Reverse();
orderedEdges.Insert(0, e);
return true;
}
return false;
}
public ImageProcessor(Color[] pixels, int imageWidth, int imageHeight, float threshold)
{
edges = new ArrayList();
points = new ArrayList();
polygons = new ArrayList();
// -- Iterate through the pixels
for (int x = 0; x < imageWidth; x++) {
float uvX = x + 0.5f;
for (int y = 0; y < imageHeight; y++) {
float uvY = y+0.5f;
// Exit early if the current pixel is not opaque
if (pixels[x + (imageWidth * y)].a < threshold) continue;
// Get the surrounding pixels' alpha values using pixel space (origin is bottom left)
float UpAlpha = 0.0f;
float DownAlpha = 0.0f;
float RightAlpha = 0.0f;
float LeftAlpha = 0.0f;
float UpRightAlpha = 0.0f;
float UpLeftAlpha = 0.0f;
float DownRightAlpha = 0.0f;
if (x>0){
LeftAlpha = pixels[x - 1 + (imageWidth * y)].a;
if (y<imageHeight-1){
UpLeftAlpha = pixels[x - 1 + (imageWidth * (y + 1))].a;
}
}
if (x<imageWidth-1){
if (y>0){
DownRightAlpha = pixels[x + 1 + (imageWidth * (y - 1))].a;
}
RightAlpha = pixels[x + 1 + (imageWidth * y)].a;
if (y<imageHeight-1){
UpRightAlpha = pixels[x + 1 + (imageWidth * (y + 1))].a;
}
}
if (y>0){
DownAlpha = pixels[x + (imageWidth * (y-1))].a;
}
if (y<imageHeight-1){
UpAlpha = pixels[x + (imageWidth * (y+1))].a;
}
//=========================================
// Try to add an edge between the current pixel and the one directly above it
// Above
if (UpAlpha >= threshold) {
if (UpRightAlpha < threshold && RightAlpha < threshold) {
if (UpLeftAlpha >= threshold || LeftAlpha >= threshold) {
ImageEdge e = new ImageEdge(GetPoint(x,y,uvX/imageWidth,uvY/imageHeight), GetPoint(x,y+1,uvX/imageWidth,(uvY+1)/imageHeight));
edges.Add(e);
}
}
else if ( UpLeftAlpha < threshold && LeftAlpha < threshold) {
if (UpRightAlpha >= threshold || RightAlpha >= threshold) {
ImageEdge e = new ImageEdge(GetPoint(x,y,uvX/imageWidth,uvY/imageHeight), GetPoint(x,y+1,uvX/imageWidth,(uvY+1)/imageHeight));
edges.Add(e);
}
}
}
// Try to add an edge between the current pixel and one diagonally above it
// Above and right
if (UpRightAlpha >= threshold) {
if (UpAlpha < threshold && RightAlpha >= threshold) {
// .
// *.
ImageEdge e = new ImageEdge(GetPoint(x,y,uvX/imageWidth,uvY/imageHeight), GetPoint(x+1,y+1,(uvX+1)/imageWidth,(uvY+1)/imageHeight));
edges.Add(e);
}
else if (UpAlpha >= threshold && RightAlpha < threshold) {
// ..
// *
ImageEdge e = new ImageEdge(GetPoint(x,y,uvX/imageWidth,uvY/imageHeight), GetPoint(x+1,y+1,(uvX+1)/imageWidth,(uvY+1)/imageHeight));
edges.Add(e);
}
}
// Try to add an edge between the current pixel and the one directly right of it
// Right
if (RightAlpha >= threshold) {
if (UpAlpha < threshold && UpRightAlpha < threshold) {
if (DownAlpha >= threshold || DownRightAlpha >= threshold) {
// *. or *. *.
// . . ..
ImageEdge e = new ImageEdge(GetPoint(x,y,uvX/imageWidth,uvY/imageHeight), GetPoint(x+1,y,(uvX+1)/imageWidth,uvY/imageHeight));
edges.Add(e);
}
}
else if ( DownAlpha < threshold && DownRightAlpha < threshold) {
if (UpAlpha >= threshold || UpRightAlpha >= threshold) {
// add the horizontal edge
ImageEdge e = new ImageEdge(GetPoint(x,y,uvX/imageWidth,uvY/imageHeight), GetPoint(x+1,y,(uvX+1)/imageWidth,uvY/imageHeight));
edges.Add(e);
}
}
}
//Down Right
if (DownRightAlpha >= threshold) {
if ( RightAlpha < threshold && DownAlpha >= threshold) {
// *
// ..
ImageEdge e = new ImageEdge(GetPoint(x,y,uvX/imageWidth,uvY/imageHeight), GetPoint(x+1,y-1,(uvX+1)/imageWidth,(uvY-1)/imageHeight));
edges.Add(e);
}
else if (RightAlpha >= threshold && DownAlpha < threshold) {
// *.
// .
ImageEdge e = new ImageEdge(GetPoint(x,y,uvX/imageWidth,uvY/imageHeight), GetPoint(x+1,y-1,(uvX+1)/imageWidth,(uvY-1)/imageHeight));
edges.Add(e);
}
}
}
}
CreateFaces();
}
