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using System;
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using System.Collections.Generic;
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namespace Assistance {
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public class AssistantVanishingPoint: Assistant {
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public ActivePoint center;
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public ActivePoint a0;
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public ActivePoint a1;
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public ActivePoint b0;
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public ActivePoint b1;
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public ActivePoint step;
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public AssistantVanishingPoint(Document document, Point center): base(document) {
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this.center = new ActivePoint(this, ActivePoint.Type.CircleCross, center);
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a0 = new ActivePoint(this, ActivePoint.Type.CircleFill, center + new Point(-100.0, 0.0));
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a1 = new ActivePoint(this, ActivePoint.Type.Circle, center + new Point(-200.0, 0.0));
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b0 = new ActivePoint(this, ActivePoint.Type.CircleFill, center + new Point(100.0, 0.0));
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b1 = new ActivePoint(this, ActivePoint.Type.Circle, center + new Point(200.0, 0.0));
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step = new ActivePoint(this, ActivePoint.Type.Circle, (a0.position + a1.position)/2);
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}
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private void fixCenter() {
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if (!a0.position.isEqual(a1.position) && !b0.position.isEqual(b1.position)) {
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Point a = a0.position;
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Point b = b0.position;
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Point da = a1.position - a;
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Point db = b1.position - b;
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Point ab = b - a;
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double k = db.x*da.y - db.y*da.x;
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if (Math.Abs(k) > 0.00001) {
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double lb = (da.x*ab.y - da.y*ab.x)/k;
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center.position.x = lb*db.x + b.x;
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center.position.y = lb*db.y + b.y;
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}
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}
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}
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private void fixSidePoint(ActivePoint p0, ActivePoint p1, Point previousP0) {
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if (!p0.position.isEqual(center.position)) {
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Point dp0 = p0.position - center.position;
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Point dp1 = p1.position - previousP0;
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p1.position = center.position + dp0*(dp0.len() + dp1.len())/dp0.len();
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}
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}
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private void fixSidePoint(ActivePoint p0, ActivePoint p1) {
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fixSidePoint(p0, p1, p0.position);
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}
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public void fixPoints() {
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fixSidePoint(a0, a1);
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fixSidePoint(a0, step);
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fixSidePoint(b0, b1);
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fixCenter();
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}
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public override void onMovePoint(ActivePoint point, Point position) {
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Point previous = point.position;
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point.position = position;
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if (point == center) {
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a0.position += point.position - previous;
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a1.position += point.position - previous;
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step.position += point.position - previous;
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b0.position += point.position - previous;
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b1.position += point.position - previous;
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} else
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if (point == a0) {
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fixSidePoint(a0, a1, previous);
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fixSidePoint(a0, step, previous);
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fixSidePoint(b0, b1);
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} else
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if (point == b0) {
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fixSidePoint(a0, a1);
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fixSidePoint(a0, step);
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fixSidePoint(b0, b1, previous);
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} else {
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fixCenter();
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fixSidePoint(a0, a1);
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fixSidePoint(a0, step);
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fixSidePoint(b0, b1);
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}
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}
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/*
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public override Point[] getGridPoints(Point target, bool truncate) {
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double k = (a0.position - center.position).len();
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if (k < 0.00001)
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return new Point[0];
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k = (step.position - center.position).len()/k;
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//if (Math.Abs(k - 1.0) < 0.1) return new Point[0];
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Point[] points = new Point[truncate ? gridPointsCount + 1 : gridPointsCount*2 + 1];
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Point a = target - center.position;
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Point b = a;
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points[gridPointsCount] = a + center.position;
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for(int i = 1; i <= gridPointsCount; ++i) {
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a /= k;
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b *= k;
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points[gridPointsCount - i] = a + center.position;
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if (!truncate)
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points[gridPointsCount + i] = b + center.position;
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}
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return points;
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}
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*/
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public override void draw(Cairo.Context context) {
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context.Save();
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pen.apply(context);
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context.MoveTo(center.position.x, center.position.y);
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context.LineTo(a0.position.x, a0.position.y);
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context.MoveTo(center.position.x, center.position.y);
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context.LineTo(a1.position.x, a1.position.y);
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context.MoveTo(center.position.x, center.position.y);
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context.LineTo(b0.position.x, b0.position.y);
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context.MoveTo(center.position.x, center.position.y);
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context.LineTo(b1.position.x, b1.position.y);
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context.Stroke();
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context.Restore();
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}
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public override void getGuidelines(List<guideline> outGuidelines, Point target) {</guideline>
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if (!target.isEqual(center.position))
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outGuidelines.Add(new GuidelineLine(target, center.position));
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}
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}
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}
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