Created
May 19, 2016 12:52
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map color to custom range C++
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| typedef struct { | |
| double r,g,b; | |
| } COLOUR; | |
| COLOUR GetColour(double v,double vmin,double vmax) | |
| { | |
| COLOUR c = {1.0,1.0,1.0}; // white | |
| double dv; | |
| if (v < vmin) | |
| v = vmin; | |
| if (v > vmax) | |
| v = vmax; | |
| dv = vmax - vmin; | |
| if (v < (vmin + 0.25 * dv)) { | |
| c.r = 0; | |
| c.g = 4 * (v - vmin) / dv; | |
| } else if (v < (vmin + 0.5 * dv)) { | |
| c.r = 0; | |
| c.b = 1 + 4 * (vmin + 0.25 * dv - v) / dv; | |
| } else if (v < (vmin + 0.75 * dv)) { | |
| c.r = 4 * (v - vmin - 0.5 * dv) / dv; | |
| c.b = 0; | |
| } else { | |
| c.g = 1 + 4 * (vmin + 0.75 * dv - v) / dv; | |
| c.b = 0; | |
| } | |
| return(c); | |
| } |
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