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https://github.com/ultimatepp/ultimatepp.git
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83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
#include <CtrlLib/CtrlLib.h>
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using namespace Upp;
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class Gradient : public TopWindow {
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public:
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typedef Gradient CLASSNAME;
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Gradient();
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public:
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virtual void Paint(Draw& draw);
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virtual void MouseMove(Point pt, dword keyflags);
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public:
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enum { RADIUS = 100 };
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Point focus_pt;
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};
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Gradient::Gradient()
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{
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Sizeable().Zoomable();
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focus_pt = Point(0, 0);
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}
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void Gradient::Paint(Draw& draw)
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{
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draw.DrawRect(draw.GetClip(), White());
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Point mid = GetSize() >> 1;
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Rect rc(mid, Size(1, 1));
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Point f = focus_pt - mid;
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Color c1 = Black();
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Color c2 = White();
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for(int y = -RADIUS; y <= RADIUS; y++) {
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int xlim = fround(sqrt((double)(RADIUS * RADIUS - y * y)));
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for(int x = -xlim; x <= xlim; x++) {
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Point pt(x, y);
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Point d = Point(x, y) - f;
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double A = (d.x * d.x + d.y * d.y);
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double B = 2 * (d.x * f.x + d.y * f.y);
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double C = f.x * f.x + f.y * f.y - RADIUS * RADIUS;
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double t = (-B + sqrt(B * B - 4 * A * C)) / (2 * A);
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int ratio1 = fround(256 * 1 / max(t, 1e-10));
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double dpt = ((double)(d.x * d.x + d.y * d.y));
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double dpe = ((double)tabs(RADIUS * RADIUS - x * x - y * y));
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int ratio2 = fround(256 * dpt / max(dpt + dpe, 1e-10));
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int ratio3 = fround(256 * sqrt(dpt) / max(sqrt(dpt) + sqrt(dpe), 1e-10));
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ratio1 &= ~0x3f;
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ratio2 &= ~0x3f;
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ratio3 &= ~0x3f;
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Color color1 = GradientColor(c1, c2, ratio1, 256);
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Color color2 = GradientColor(c1, c2, ratio2, 256);
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Color color3 = GradientColor(c1, c2, ratio3, 256);
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// Color color(
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// c1.GetR() + (((c2.GetR() - c1.GetR()) * ratio) >> 8),
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// c1.GetG() + (((c2.GetG() - c1.GetG()) * ratio) >> 8),
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// c1.GetB() + (((c2.GetB() - c1.GetB()) * ratio) >> 8));
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draw.DrawRect(x + mid.x, y + mid.y, 1, 1, color1);
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draw.DrawRect(x + mid.x - 2 * RADIUS, y + mid.y, 1, 1, color2);
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draw.DrawRect(x + mid.x + 2 * RADIUS, y + mid.y, 1, 1, color3);
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}
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}
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draw.DrawText(mid.x - 2 * RADIUS, mid.y + RADIUS, "Rylek bez sqrt");
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draw.DrawText(mid.x, mid.y + RADIUS, "Fidler");
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draw.DrawText(mid.x + 2 * RADIUS, mid.y + RADIUS, "Rylek s sqrt");
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// rc.Inflate(RADIUS);
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// draw.DrawEllipse(rc, Null, 0, Black());
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}
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void Gradient::MouseMove(Point pt, dword keyflags)
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{
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focus_pt = pt;
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Refresh();
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}
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GUI_APP_MAIN
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{
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Gradient().Run();
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}
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