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);
argb = 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.Alpha, HSV.Hue, HSV.Saturation, 255);
}
public void Draw(Graphics g, ColorHandler.ARGB argb)
{
// Given RGB values, calculate HSV and then update the screen.
this.g = g;
HSV = ColorHandler.RGBtoHSV(argb);
CalcCoordsAndUpdate(HSV);
UpdateDisplay();
}
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 HandleRGBScroll(object sender, EventArgs e)
{
// If the R, G, or B values change, use this
// code to update the HSV 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.RGB;
argb = new ColorHandler.ARGB(tbAlpha.Value, tbRed.Value, tbGreen.Value, tbBlue.Value);
SetHSV(ColorHandler.RGBtoHSV(argb));
SetRGBLabels(argb);
Invalidate();
}
private Color[] GetColors()
{
// Create an array of COLOR_COUNT
// colors, looping through all the
// hues between 0 and 255, broken
// into COLOR_COUNT intervals. HSV is
// particularly well-suited for this,
// because the only value that changes
// as you create colors is the Hue.
var Colors = new Color[COLOR_COUNT];
for (int i = 0; i <= COLOR_COUNT - 1; i++)
{
Colors[i] = ColorHandler.HSVtoColor(255, (int)((double)(i * 255) / COLOR_COUNT), 255, 255);
}
return(Colors);
}
private void SetRGBLabels(ColorHandler.ARGB argb)
{
RefreshText(lblRed, argb.Red);
RefreshText(lblBlue, argb.Blue);
RefreshText(lblGreen, argb.Green);
RefreshText(lblAlpha, argb.Alpha);
tbHexCode.Text = string.Format("{0:X2}{1:X2}{2:X2}{3:X2}", argb.Alpha, argb.Red, argb.Green, argb.Blue);
}
private void SetRGB(ColorHandler.ARGB argb)
{
// Update the RGB values on the form.
RefreshValue(tbRed, argb.Red);
RefreshValue(tbBlue, argb.Blue);
RefreshValue(tbGreen, argb.Green);
RefreshValue(tbAlpha, argb.Alpha);
SetRGBLabels(argb);
}
private void SetHSVLabels(ColorHandler.HSV HSV)
{
RefreshText(lblHue, HSV.Hue);
RefreshText(lblSaturation, HSV.Saturation);
RefreshText(lblValue, HSV.Value);
RefreshText(lblAlpha, HSV.Alpha);
}
private void SetHSV(ColorHandler.HSV HSV)
{
// Update the HSV values on the form.
RefreshValue(tbHue, HSV.Hue);
RefreshValue(tbSaturation, HSV.Saturation);
RefreshValue(tbValue, HSV.Value);
RefreshValue(tbAlpha, HSV.Alpha);
SetHSVLabels(HSV);
}
public void Draw(Graphics g, Point mousePoint)
{
// You've moved the mouse.
// Now update the screen to match.
// Keep track of the previous color pointer point,
// so you can put the mouse there in case the
// user has clicked outside the circle.
Point newColorPoint = colorPoint;
Point 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.
Point 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;
argb = 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.
Point delta = new Point(
mousePoint.X - centerPoint.X, mousePoint.Y - centerPoint.Y);
int 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.
double 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);
}
}
// Calculate the new HSV and RGB values.
HSV.Hue = (degrees * 255 / 360);
HSV.Saturation = (int)(distance * 255);
HSV.Value = brightness;
argb = ColorHandler.HSVtoRGB(HSV);
fullColor = ColorHandler.HSVtoColor(HSV.Alpha, 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(argb, 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();
}
public ColorChangedEventArgs(ColorHandler.ARGB argb, ColorHandler.HSV HSV)
{
ARGB = argb;
this.HSV = HSV;
}
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);
argb = 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.Alpha, HSV.Hue, HSV.Saturation, 255);
}
protected void OnColorChanged(ColorHandler.ARGB argb, ColorHandler.HSV HSV)
{
var e = new ColorChangedEventArgs(argb, HSV);
ColorChanged(this, e);
}
public void Draw(Graphics g, ColorHandler.ARGB argb)
{
// Given RGB values, calculate HSV and then update the screen.
this.g = g;
HSV = ColorHandler.RGBtoHSV(argb);
CalcCoordsAndUpdate(HSV);
UpdateDisplay();
}
public void Draw(Graphics g, ColorHandler.HSV HSV)
{
// Given HSV values, update the screen.
this.g = g;
this.HSV = HSV;
CalcCoordsAndUpdate(this.HSV);
UpdateDisplay();
}