private void CalcCoordsAndUpdate(ColorHandler.HSV HSV)
{
// Convert color to real-world coordinates and then calculate
// the various points. HSV.Hue represents the degrees (0 to 360),
// HSV.Saturation represents the radius.
// This procedure doesn't draw anything--it simply
// updates class-level variables. The UpdateDisplay
// procedure uses these values to update the screen.
// Given the angle (HSV.Hue), and distance from
// the center (HSV.Saturation), and the center,
// calculate the point corresponding to
// the selected color, on the color wheel.
colorPoint = GetPoint((double)HSV.Hue / 255 * 360,
(double)HSV.Saturation / 255 * radius,
centerPoint);
// Given the brightness (HSV.value), calculate the
// point corresponding to the brightness indicator.
brightnessPoint = CalcBrightnessPoint(HSV.value);
// Store information about the selected color.
brightness = HSV.value;
selectedColor = ColorHandler.HSVtoColor(HSV);
RGB = ColorHandler.HSVtoRGB(HSV);
// The full color is the same as HSV, except that the
// brightness is set to full (255). This is the top-most
// color in the brightness gradient.
fullColor = ColorHandler.HSVtoColor(HSV.Hue, HSV.Saturation, 255);
}
private void HandleHSVScroll(object sender, EventArgs e)
// If the H, S, or V values change, use this
// code to update the RGB values and invalidate
// the color wheel (so it updates the pointers).
// Check the isInUpdate flag to avoid recursive events
// when you update the NumericUpdownControls.
{
changeType = ChangeStyle.HSV;
hsv = new ColorHandler.HSV(tbAlpha.Value, tbHue.Value, tbSaturation.Value, tbValue.Value);
SetRGB(ColorHandler.HSVtoRGB(hsv));
SetHSVLabels(hsv);
Invalidate();
}
private void HandleHSVChange(object sender, EventArgs e)
{
// If the H, S, or V values change, use this
// code to update the RGB values and invalidate
// the color wheel (so it updates the pointers).
// Check the isInUpdate flag to avoid recursive events
// when you update the NumericUpdownControls.
if (!isInUpdate)
{
changeType = ChangeStyle.HSV;
HSV = new ColorHandler.HSV((int)(nudHue.Value), (int)(nudSaturation.Value), (int)(nudBrightness.Value));
SetRGB(ColorHandler.HSVtoRGB(HSV));
this.Invalidate();
}
}
/// <summary>
/// The update box.
/// </summary>
public void updateBox()
{
colorBox.BackColor = ColorHandler.HSVtoColor(hsvColor);
ColorHandler.RGB tempRGB = ColorHandler.HSVtoRGB(hsvColor);
updatingColors = true;
if (alphaText != null)
{
alphaText.Text = (this.color.Alpha / 255f).ToString();
}
redText.Text = (this.color.Red / 255f).ToString();
greenText.Text = (this.color.Green / 255f).ToString();
blueText.Text = (this.color.Blue / 255f).ToString();
updatingColors = false;
}
private void GrabColor(object sender, Point mouseXY)
{
int cntlNum = this.Controls.IndexOf((Control)sender);
int cx = mouseXY.X;
int cy = mouseXY.Y;
switch (cntlNum)
{
case 0:
// center our coordinate system so the middle is (0,0), and positive Y is facing up
cx -= (this.Controls[cntlNum].Width / 2);
cy -= (this.Controls[cntlNum].Height / 2);
if (cx < this.Controls[cntlNum].Width / 2)
{
double theta = Math.Atan2(cy, cx);
if (theta < 0)
{
theta += 2 * Math.PI;
}
double alpha = Math.Sqrt((cx * cx) + (cy * cy));
int h = (int)((theta / (Math.PI * 2)) * 360.0);
int s = (int)Math.Min(100.0, (alpha / (double)(this.Controls[0].Width / 2)) * 100);
int v = hsvColor.value;
hsvColor = new ColorHandler.HSV(h, s, v);
OnColorChanged();
updateBar();
}
break;
case 1:
if (cx < this.Controls[cntlNum].Width)
{
hsvColor.value = Math.Max(0, Math.Min(100, 100 - (cy * 100 / this.Controls[cntlNum].Height)));
updateBox();
}
break;
}
this.color = ColorHandler.HSVtoRGB(hsvColor);
Invalidate(true);
}
public void Draw(Graphics g, Point mousePoint)
{
// You've moved the mouse.
// Now update the screen to match.
double distance;
int degrees;
Point delta;
Point newColorPoint;
Point newBrightnessPoint;
Point newPoint;
// Keep track of the previous color pointer point,
// so you can put the mouse there in case the
// user has clicked outside the circle.
newColorPoint = colorPoint;
newBrightnessPoint = brightnessPoint;
// Store this away for later use.
this.g = g;
if (currentState == MouseState.MouseUp)
{
if (!mousePoint.IsEmpty)
{
if (colorRegion.IsVisible(mousePoint))
{
// Is the mouse point within the color circle?
// If so, you just clicked on the color wheel.
currentState = MouseState.ClickOnColor;
}
else if (brightnessRegion.IsVisible(mousePoint))
{
// Is the mouse point within the brightness area?
// You clicked on the brightness area.
currentState = MouseState.ClickOnBrightness;
}
else
{
// Clicked outside the color and the brightness
// regions. In that case, just put the
// pointers back where they were.
currentState = MouseState.ClickOutsideRegion;
}
}
}
switch (currentState)
{
case MouseState.ClickOnBrightness:
case MouseState.DragInBrightness:
// Calculate new color information
// based on the brightness, which may have changed.
newPoint = mousePoint;
if (newPoint.Y < brightnessMin)
{
newPoint.Y = brightnessMin;
}
else if (newPoint.Y > brightnessMax)
{
newPoint.Y = brightnessMax;
}
newBrightnessPoint = new Point(brightnessX, newPoint.Y);
brightness = (int)((brightnessMax - newPoint.Y) * brightnessScaling);
HSV.value = brightness;
RGB = ColorHandler.HSVtoRGB(HSV);
break;
case MouseState.ClickOnColor:
case MouseState.DragInColor:
// Calculate new color information
// based on selected color, which may have changed.
newColorPoint = mousePoint;
// Calculate x and y distance from the center,
// and then calculate the angle corresponding to the
// new location.
delta = new Point(
mousePoint.X - centerPoint.X, mousePoint.Y - centerPoint.Y);
degrees = CalcDegrees(delta);
// Calculate distance from the center to the new point
// as a fraction of the radius. Use your old friend,
// the Pythagorean theorem, to calculate this value.
distance = Math.Sqrt(delta.X * delta.X + delta.Y * delta.Y) / radius;
if (currentState == MouseState.DragInColor)
{
if (distance > 1)
{
// Mouse is down, and outside the circle, but you
// were previously dragging in the color circle.
// What to do?
// In that case, move the point to the edge of the
// circle at the correct angle.
distance = 1;
newColorPoint = GetPoint(degrees, radius, centerPoint);
}
}
if (distance > 1)
{
distance = 1;
}
// Calculate the new HSV and RGB values.
HSV.Hue = (int)(degrees * 255 / 360);
HSV.Saturation = (int)(distance * 255);
HSV.value = brightness;
RGB = ColorHandler.HSVtoRGB(HSV);
fullColor = ColorHandler.HSVtoColor(HSV.Hue, HSV.Saturation, 255);
break;
}
selectedColor = ColorHandler.HSVtoColor(HSV);
// Raise an event back to the parent form,
// so the form can update any UI it's using
// to display selected color values.
OnColorChanged(RGB, HSV);
// On the way out, set the new state.
switch (currentState)
{
case MouseState.ClickOnBrightness:
currentState = MouseState.DragInBrightness;
break;
case MouseState.ClickOnColor:
currentState = MouseState.DragInColor;
break;
case MouseState.ClickOutsideRegion:
currentState = MouseState.DragOutsideRegion;
break;
}
// Store away the current points for next time.
colorPoint = newColorPoint;
brightnessPoint = newBrightnessPoint;
// Draw the gradients and points.
UpdateDisplay();
}