using System;
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using HalconDotNet;
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namespace Bro.UI.HalconDisplay.ViewROI
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{
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/// <summary>
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/// This class demonstrates one of the possible implementations for a
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/// circular ROI. ROICircle inherits from the base class ROI and
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/// implements (besides other auxiliary methods) all virtual methods
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/// defined in ROI.cs.
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/// </summary>
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public class ROICircle : ROI
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{
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private double radius;
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private double row1, col1; // first handle
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private double midR, midC; // second handle
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public ROICircle()
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{
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NumHandles = 2; // one at corner of circle + midpoint
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activeHandleIdx = 1;
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}
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/// <summary>Creates a new ROI instance at the mouse position</summary>
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public override void createROI(double midX, double midY)
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{
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midR = midY;
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midC = midX;
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radius = 50;
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row1 = midR;
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col1 = midC + radius;
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}
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/// <summary>Paints the ROI into the supplied window</summary>
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/// <param name="window">HALCON window</param>
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public override void draw(HalconDotNet.HWindow window)
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{
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window.DispCircle(midR, midC, radius);
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window.DispRectangle2(row1, col1, 0, 5, 5);
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window.DispRectangle2(midR, midC, 0, 5, 5);
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}
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/// <summary>
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/// Returns the distance of the ROI handle being
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/// closest to the image point(x,y)
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/// </summary>
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public override double distToClosestHandle(double x, double y)
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{
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double max = 10000;
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double [] val = new double[NumHandles];
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val[0] = HMisc.DistancePp(y, x, row1, col1); // border handle
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val[1] = HMisc.DistancePp(y, x, midR, midC); // midpoint
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for (int i=0; i < NumHandles; i++)
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{
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if (val[i] < max)
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{
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max = val[i];
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activeHandleIdx = i;
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}
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}// end of for
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return val[activeHandleIdx];
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}
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/// <summary>
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/// Paints the active handle of the ROI object into the supplied window
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/// </summary>
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public override void displayActive(HalconDotNet.HWindow window)
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{
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switch (activeHandleIdx)
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{
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case 0:
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window.DispRectangle2(row1, col1, 0, 5, 5);
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break;
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case 1:
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window.DispRectangle2(midR, midC, 0, 5, 5);
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break;
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}
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}
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/// <summary>Gets the HALCON region described by the ROI</summary>
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public override HRegion getRegion()
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{
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HRegion region = new HRegion();
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region.GenCircle(midR, midC, radius);
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return region;
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}
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public override double getDistanceFromStartPoint(double row, double col)
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{
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double sRow = midR; // assumption: we have an angle starting at 0.0
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double sCol = midC + 1 * radius;
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double angle = HMisc.AngleLl(midR, midC, sRow, sCol, midR, midC, row, col);
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if (angle < 0)
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angle += 2 * Math.PI;
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return (radius * angle);
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}
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/// <summary>
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/// Gets the model information described by
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/// the ROI
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/// </summary>
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public override HTuple getModelData()
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{
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return new HTuple(new double[] { midR, midC, radius });
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}
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/// <summary>
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/// Recalculates the shape of the ROI. Translation is
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/// performed at the active handle of the ROI object
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/// for the image coordinate (x,y)
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/// </summary>
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public override void moveByHandle(double newX, double newY)
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{
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HTuple distance;
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double shiftX,shiftY;
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switch (activeHandleIdx)
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{
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case 0: // handle at circle border
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row1 = newY;
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col1 = newX;
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HOperatorSet.DistancePp(new HTuple(row1), new HTuple(col1),
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new HTuple(midR), new HTuple(midC),
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out distance);
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radius = distance[0].D;
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break;
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case 1: // midpoint
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shiftY = midR - newY;
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shiftX = midC - newX;
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midR = newY;
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midC = newX;
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row1 -= shiftY;
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col1 -= shiftX;
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break;
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}
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}
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}//end of class
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}//end of namespace
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