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Add line ROI rotation and translation sample #176

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Original file line number Diff line number Diff line change
@@ -0,0 +1,62 @@
/* This script contains a couple of useful utilities for
* manipulating line ROIs and point coordinates on an image,
* as well as an internal test to demonstrate their utility.
*/

// Set up test image:
newImage("test1", "RGB black", 256, 256, 1);
makeRectangle(50, 50, 156, 156);
setForegroundColor(0, 255, 255);
run("Fill", "slice");
makeRectangle(120,120,16,16);
setForegroundColor(0, 0, 0);
run("Fill", "slice");
makeRectangle(60,126,50,4);
run("Fill", "slice");
makeRectangle(126,146,4,50);
setForegroundColor(120, 120, 120);
run("Fill", "slice");

// Line selection and rotation:
makeLine(50, 50, 206, 206);

// Test rotations with 45 degree rotations:
waitForUser("Check");
rotateCurrentLineSelection(45);
waitForUser("Check");
rotateCurrentLineSelection(45);
waitForUser("Check");
rotateCurrentLineSelection(45);
waitForUser("Translate");
translateCurrentLineSelection(78,0);

// Functions required to do the rotation:
function rotateCurrentLineSelection(theta){
getSelectionCoordinates( x, y );
getDimensions(w,h,ch,sl,fr);
p1 = rotatePoint(theta,x[0],y[0],h,w);
p2 = rotatePoint(theta,x[1],y[1],h,w);
makeLine(p1[0],p1[1],p2[0],p2[1]);
}

function translateCurrentLineSelection(deltx,delty){
getSelectionCoordinates(x,y);
x = newArray(x[0]+deltx,x[1]+deltx);
y = newArray(y[0]+delty,y[1]+delty);
makeLine(x[0],y[0],x[1],y[1]);
}

function rotatePoint(theta,x,y,h,w){
// Translate to centre origin cartesian and radians
x1 = x-(w/2);
y1 = -(y-(h/2));
theta = theta*PI/180;
// Rotate point
x2 = (x1*cos(theta))-(y1*sin(theta));
y2 = (x1*sin(theta))+(y1*cos(theta));
// Translate back to imageJ coordinates
x2 = x2 + (w/2);
y2 = (h/2)-y2;
point = newArray(x2,y2);
return point;
}