Beispiel #1
0
        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);
        }
Beispiel #2
0
 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();
 }
Beispiel #3
0
        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();
        }