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86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
#include "../Platform/stdafx.h"
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#include "Color.h"
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// Creates an opaque sRGB color with the specified red, green, and blue values
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// in the range (0.0 - 1.0). Alpha is defaulted to 1.0. The actual color used in
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// rendering depends on finding the best match given the color space available
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// for a particular output device. Parameters: r - the red component g - the
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// green component b - the blue component Throws: IllegalArgumentException - if
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// r, g or b are outside of the range 0.0 to 1.0, inclusive
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Color::Color(float r, float g, float b) {
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assert(r >= 0.0f && r <= 1.0f);
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assert(g >= 0.0f && g <= 1.0f);
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assert(b >= 0.0f && b <= 1.0f);
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// argb
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colour = ((0xFF << 24) | ((int)(r * 255) << 16) | ((int)(g * 255) << 8) |
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((int)(b * 255)));
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}
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Color::Color(int r, int g, int b) {
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colour =
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((0xFF << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8) | ((b & 0xff)));
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}
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// Creates a Color object based on the specified values for the HSB color model.
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// The s and b components should be floating-point values between zero and one
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// (numbers in the range 0.0-1.0). The h component can be any floating-point
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// number. The floor of this number is subtracted from it to create a fraction
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// between 0 and 1. This fractional number is then multiplied by 360 to produce
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// the hue angle in the HSB color model.
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//
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// Parameters:
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// h - the hue component
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// s - the saturation of the color
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// b - the brightness of the color
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// Returns:
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// a Color object with the specified hue, saturation, and brightness.
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Color Color::getHSBColor(float hue, float saturation, float brightness) {
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int r = 0, g = 0, b = 0;
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if (saturation == 0) {
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r = g = b = (int)(brightness * 255.0f + 0.5f);
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} else {
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float h = (hue - (float)floor(hue)) * 6.0f;
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float f = h - (float)floor(h);
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float p = brightness * (1.0f - saturation);
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float q = brightness * (1.0f - saturation * f);
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float t = brightness * (1.0f - (saturation * (1.0f - f)));
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switch ((int)h) {
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case 0:
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r = (int)(brightness * 255.0f + 0.5f);
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g = (int)(t * 255.0f + 0.5f);
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b = (int)(p * 255.0f + 0.5f);
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break;
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case 1:
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r = (int)(q * 255.0f + 0.5f);
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g = (int)(brightness * 255.0f + 0.5f);
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b = (int)(p * 255.0f + 0.5f);
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break;
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case 2:
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r = (int)(p * 255.0f + 0.5f);
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g = (int)(brightness * 255.0f + 0.5f);
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b = (int)(t * 255.0f + 0.5f);
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break;
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case 3:
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r = (int)(p * 255.0f + 0.5f);
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g = (int)(q * 255.0f + 0.5f);
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b = (int)(brightness * 255.0f + 0.5f);
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break;
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case 4:
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r = (int)(t * 255.0f + 0.5f);
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g = (int)(p * 255.0f + 0.5f);
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b = (int)(brightness * 255.0f + 0.5f);
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break;
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case 5:
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r = (int)(brightness * 255.0f + 0.5f);
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g = (int)(p * 255.0f + 0.5f);
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b = (int)(q * 255.0f + 0.5f);
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break;
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}
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}
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return Color(r, g, b);
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}
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int Color::getRGB() { return colour; } |