added gui

LinearGradientExercise/Content/css/farbtastic.css

@@ -0,0 +1,51 @@
+/**
+ * Farbtastic Color Picker 1.2
+ * © 2008 Steven Wittens
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+.farbtastic {
+  position: relative;
+}
+.farbtastic * {
+  position: absolute;
+  cursor: crosshair;
+}
+.farbtastic, .farbtastic .wheel {
+  width: 195px;
+  height: 195px;
+}
+.farbtastic .color, .farbtastic .overlay {
+  top: 47px;
+  left: 47px;
+  width: 101px;
+  height: 101px;
+}
+.farbtastic .wheel {
+  background: url(wheel.png) no-repeat;
+  width: 195px;
+  height: 195px;
+}
+.farbtastic .overlay {
+  background: url(mask.png) no-repeat;
+}
+.farbtastic .marker {
+  width: 17px;
+  height: 17px;
+  margin: -8px 0 0 -8px;
+  overflow: hidden; 
+  background: url(marker.png) no-repeat;
+}
+

LinearGradientExercise/Content/scripts/farbtastic.js

@@ -0,0 +1,345 @@
+/**
+ * Farbtastic Color Picker 1.2
+ * © 2008 Steven Wittens
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+jQuery.fn.farbtastic = function (callback) {
+  $.farbtastic(this, callback);
+  return this;
+};
+
+jQuery.farbtastic = function (container, callback) {
+  var container = $(container).get(0);
+  return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
+}
+
+jQuery._farbtastic = function (container, callback) {
+  // Store farbtastic object
+  var fb = this;
+
+  // Insert markup
+  $(container).html('<div class="farbtastic"><div class="color"></div><div class="wheel"></div><div class="overlay"></div><div class="h-marker marker"></div><div class="sl-marker marker"></div></div>');
+  var e = $('.farbtastic', container);
+  fb.wheel = $('.wheel', container).get(0);
+  // Dimensions
+  fb.radius = 84;
+  fb.square = 100;
+  fb.width = 194;
+
+  // Fix background PNGs in IE6
+  if (navigator.appVersion.match(/MSIE [0-6]\./)) {
+    $('*', e).each(function () {
+      if (this.currentStyle.backgroundImage != 'none') {
+        var image = this.currentStyle.backgroundImage;
+        image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
+        $(this).css({
+          'backgroundImage': 'none',
+          'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
+        });
+      }
+    });
+  }
+
+  /**
+   * Link to the given element(s) or callback.
+   */
+  fb.linkTo = function (callback) {
+    // Unbind previous nodes
+    if (typeof fb.callback == 'object') {
+      $(fb.callback).unbind('keyup', fb.updateValue);
+    }
+
+    // Reset color
+    fb.color = null;
+
+    // Bind callback or elements
+    if (typeof callback == 'function') {
+      fb.callback = callback;
+    }
+    else if (typeof callback == 'object' || typeof callback == 'string') {
+      fb.callback = $(callback);
+      fb.callback.bind('keyup', fb.updateValue);
+      if (fb.callback.get(0).value) {
+        fb.setColor(fb.callback.get(0).value);
+      }
+    }
+    return this;
+  }
+  fb.updateValue = function (event) {
+    if (this.value && this.value != fb.color) {
+      fb.setColor(this.value);
+    }
+  }
+
+  /**
+   * Change color with HTML syntax #123456
+   */
+  fb.setColor = function (color) {
+    var unpack = fb.unpack(color);
+    if (fb.color != color && unpack) {
+      fb.color = color;
+      fb.rgb = unpack;
+      fb.hsl = fb.RGBToHSL(fb.rgb);
+      fb.updateDisplay();
+    }
+    return this;
+  }
+
+  /**
+   * Change color with HSL triplet [0..1, 0..1, 0..1]
+   */
+  fb.setHSL = function (hsl) {
+    fb.hsl = hsl;
+    fb.rgb = fb.HSLToRGB(hsl);
+    fb.color = fb.pack(fb.rgb);
+    fb.updateDisplay();
+    return this;
+  }
+
+  /////////////////////////////////////////////////////
+
+  /**
+   * Retrieve the coordinates of the given event relative to the center
+   * of the widget.
+   */
+  fb.widgetCoords = function (event) {
+    var x, y;
+    var el = event.target || event.srcElement;
+    var reference = fb.wheel;
+
+    if (typeof event.offsetX != 'undefined') {
+      // Use offset coordinates and find common offsetParent
+      var pos = { x: event.offsetX, y: event.offsetY };
+
+      // Send the coordinates upwards through the offsetParent chain.
+      var e = el;
+      while (e) {
+        e.mouseX = pos.x;
+        e.mouseY = pos.y;
+        pos.x += e.offsetLeft;
+        pos.y += e.offsetTop;
+        e = e.offsetParent;
+      }
+
+      // Look for the coordinates starting from the wheel widget.
+      var e = reference;
+      var offset = { x: 0, y: 0 }
+      while (e) {
+        if (typeof e.mouseX != 'undefined') {
+          x = e.mouseX - offset.x;
+          y = e.mouseY - offset.y;
+          break;
+        }
+        offset.x += e.offsetLeft;
+        offset.y += e.offsetTop;
+        e = e.offsetParent;
+      }
+
+      // Reset stored coordinates
+      e = el;
+      while (e) {
+        e.mouseX = undefined;
+        e.mouseY = undefined;
+        e = e.offsetParent;
+      }
+    }
+    else {
+      // Use absolute coordinates
+      var pos = fb.absolutePosition(reference);
+      x = (event.pageX || 0*(event.clientX + $('html').get(0).scrollLeft)) - pos.x;
+      y = (event.pageY || 0*(event.clientY + $('html').get(0).scrollTop)) - pos.y;
+    }
+    // Subtract distance to middle
+    return { x: x - fb.width / 2, y: y - fb.width / 2 };
+  }
+
+  /**
+   * Mousedown handler
+   */
+  fb.mousedown = function (event) {
+    // Capture mouse
+    if (!document.dragging) {
+      $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
+      document.dragging = true;
+    }
+
+    // Check which area is being dragged
+    var pos = fb.widgetCoords(event);
+    fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
+
+    // Process
+    fb.mousemove(event);
+    return false;
+  }
+
+  /**
+   * Mousemove handler
+   */
+  fb.mousemove = function (event) {
+    // Get coordinates relative to color picker center
+    var pos = fb.widgetCoords(event);
+
+    // Set new HSL parameters
+    if (fb.circleDrag) {
+      var hue = Math.atan2(pos.x, -pos.y) / 6.28;
+      if (hue < 0) hue += 1;
+      fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
+    }
+    else {
+      var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
+      var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
+      fb.setHSL([fb.hsl[0], sat, lum]);
+    }
+    return false;
+  }
+
+  /**
+   * Mouseup handler
+   */
+  fb.mouseup = function () {
+    // Uncapture mouse
+    $(document).unbind('mousemove', fb.mousemove);
+    $(document).unbind('mouseup', fb.mouseup);
+    document.dragging = false;
+  }
+
+  /**
+   * Update the markers and styles
+   */
+  fb.updateDisplay = function () {
+    // Markers
+    var angle = fb.hsl[0] * 6.28;
+    $('.h-marker', e).css({
+      left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
+      top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
+    });
+
+    $('.sl-marker', e).css({
+      left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
+      top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
+    });
+
+    // Saturation/Luminance gradient
+    $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
+
+    // Linked elements or callback
+    if (typeof fb.callback == 'object') {
+      // Set background/foreground color
+      $(fb.callback).css({
+        backgroundColor: fb.color,
+        color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
+      });
+
+      // Change linked value
+      $(fb.callback).each(function() {
+        if (this.value && this.value != fb.color) {
+          this.value = fb.color;
+        }
+      });
+    }
+    else if (typeof fb.callback == 'function') {
+      fb.callback.call(fb, fb.color);
+    }
+  }
+
+  /**
+   * Get absolute position of element
+   */
+  fb.absolutePosition = function (el) {
+    var r = { x: el.offsetLeft, y: el.offsetTop };
+    // Resolve relative to offsetParent
+    if (el.offsetParent) {
+      var tmp = fb.absolutePosition(el.offsetParent);
+      r.x += tmp.x;
+      r.y += tmp.y;
+    }
+    return r;
+  };
+
+  /* Various color utility functions */
+  fb.pack = function (rgb) {
+    var r = Math.round(rgb[0] * 255);
+    var g = Math.round(rgb[1] * 255);
+    var b = Math.round(rgb[2] * 255);
+    return '#' + (r < 16 ? '0' : '') + r.toString(16) +
+           (g < 16 ? '0' : '') + g.toString(16) +
+           (b < 16 ? '0' : '') + b.toString(16);
+  }
+
+  fb.unpack = function (color) {
+    if (color.length == 7) {
+      return [parseInt('0x' + color.substring(1, 3)) / 255,
+        parseInt('0x' + color.substring(3, 5)) / 255,
+        parseInt('0x' + color.substring(5, 7)) / 255];
+    }
+    else if (color.length == 4) {
+      return [parseInt('0x' + color.substring(1, 2)) / 15,
+        parseInt('0x' + color.substring(2, 3)) / 15,
+        parseInt('0x' + color.substring(3, 4)) / 15];
+    }
+  }
+
+  fb.HSLToRGB = function (hsl) {
+    var m1, m2, r, g, b;
+    var h = hsl[0], s = hsl[1], l = hsl[2];
+    m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
+    m1 = l * 2 - m2;
+    return [this.hueToRGB(m1, m2, h+0.33333),
+        this.hueToRGB(m1, m2, h),
+        this.hueToRGB(m1, m2, h-0.33333)];
+  }
+
+  fb.hueToRGB = function (m1, m2, h) {
+    h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
+    if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
+    if (h * 2 < 1) return m2;
+    if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
+    return m1;
+  }
+
+  fb.RGBToHSL = function (rgb) {
+    var min, max, delta, h, s, l;
+    var r = rgb[0], g = rgb[1], b = rgb[2];
+    min = Math.min(r, Math.min(g, b));
+    max = Math.max(r, Math.max(g, b));
+    delta = max - min;
+    l = (min + max) / 2;
+    s = 0;
+    if (l > 0 && l < 1) {
+      s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
+    }
+    h = 0;
+    if (delta > 0) {
+      if (max == r && max != g) h += (g - b) / delta;
+      if (max == g && max != b) h += (2 + (b - r) / delta);
+      if (max == b && max != r) h += (4 + (r - g) / delta);
+      h /= 6;
+    }
+    return [h, s, l];
+  }
+
+  // Install mousedown handler (the others are set on the document on-demand)
+  $('*', e).mousedown(fb.mousedown);
+
+    // Init color
+  fb.setColor('#000000');
+
+  // Set linked elements/callback
+  if (callback) {
+    fb.linkTo(callback);
+  }
+}