using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Text; using System.Windows.Forms; namespace CodeImp.DoomBuilder.UDMFControls { public partial class AngleControl : UserControl { private const float RADIANS_PER_DEGREE = (float)Math.PI / 180.0f; private const float DEGREES_PER_RADIAN = 180.0f / (float)Math.PI; private bool blockEvents; //draw related private Pen penRed; private Point center; private int needleLength; //events public event EventHandler OnAngleChanged; private float angle; public float Value { get { return (float)nudAngle.Value; } set { prevAngle = (float)nudAngle.Value; angle = General.ClampAngle(359 - value); blockEvents = true; nudAngle.Value = (decimal)General.ClampAngle(value); blockEvents = false; panelAngleControl.Invalidate(); } } private float prevAngle; public float Delta { get { return (float)nudAngle.Value - prevAngle; } } public bool SnapAngle; public AngleControl() { InitializeComponent(); penRed = new Pen(Color.Red, 2.0f); center = new Point(panelAngleControl.Width / 2, panelAngleControl.Height / 2); needleLength = center.X - 4; angle = 0; //events panelAngleControl.MouseDown += new MouseEventHandler(panelAngleControl_MouseDown); panelAngleControl.MouseUp += new MouseEventHandler(panelAngleControl_MouseUp); } private void update() { //redraw panelAngleControl.Invalidate(); //dispatch event if (OnAngleChanged != null) OnAngleChanged(this, EventArgs.Empty); } private int calcDegrees(Point pt) { int degrees; if (pt.X == 0) { // The point is on the y-axis. Determine whether it's above or below the x-axis, and return the // corresponding angle. Note that the orientation of the y-coordinate is backwards. That is, // A positive Y value indicates a point BELOW the x-axis. if (pt.Y > 0) degrees = 270; else degrees = 90; } else { // This value needs to be multiplied by -1 because the y-coordinate is opposite from the normal direction here. // That is, a y-coordinate that's "higher" on the form has a lower y-value, in this coordinate // system. So everything's off by a factor of -1 when performing the ratio calculations. degrees = (int)(-Math.Atan((double)pt.Y / pt.X) * DEGREES_PER_RADIAN); // If the x-coordinate of the selected point is to the left of the center of the circle, you // need to add 180 degrees to the angle. ArcTan only gives you a value on the right-hand side // of the circle. if (pt.X < 0) degrees += 180; // Ensure that the return value is between 0 and 360. degrees = General.ClampAngle(degrees); } return degrees; } //events private void nudAngle_ValueChanged(object sender, EventArgs e) { if (!blockEvents) { prevAngle = angle; angle = (int)((NumericUpDown)sender).Value; update(); } } private void panelAngleControl_Paint(object sender, PaintEventArgs e) { //angle line float angleDeg = (float)((angle + 450) % 360) * RADIANS_PER_DEGREE; int px = center.X + (int)(Math.Sin(angleDeg) * (float)needleLength); int py = center.Y + (int)(Math.Cos(angleDeg) * (float)needleLength); e.Graphics.DrawLine(penRed, center, new Point(px, py)); } //mouse events private void panelAngleControl_MouseDown(object sender, MouseEventArgs e) { Point delta = new Point(e.X - center.X, e.Y - center.Y); int distance = (int)(Math.Sqrt(delta.X * delta.X + delta.Y * delta.Y) / center.X); //center.X == dial radius if (distance < center.X) //clicked inside dial panelAngleControl.MouseMove += new MouseEventHandler(panelAngleControl_MouseMove); } private void panelAngleControl_MouseUp(object sender, MouseEventArgs e) { panelAngleControl.MouseMove -= panelAngleControl_MouseMove; prevAngle = (float)nudAngle.Value; if (SnapAngle) angle = (((int)(Math.Round((float)calcDegrees(new Point(e.X - center.X, e.Y - center.Y)) / 45f)) * 45) + 359) % 360; else angle = calcDegrees(new Point(e.X - center.X, e.Y - center.Y)); blockEvents = true; nudAngle.Value = (decimal)(359f - angle); blockEvents = false; update(); //reset snap state SnapAngle = false; } private void panelAngleControl_MouseMove(object sender, MouseEventArgs e) { prevAngle = (float)nudAngle.Value; angle = calcDegrees(new Point(e.X - center.X, e.Y - center.Y)); blockEvents = true; nudAngle.Value = (decimal)(359f - angle); blockEvents = false; update(); } } }