68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
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#ifndef CANVAS_H
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#define CANVAS_H
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#include <stdint.h>
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typedef double real;
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/**
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* Velmi jednoduché kreslení úseček a kruhů.
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*/
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struct FPoint {
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real x,y;
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FPoint () : x(0), y(0) {};
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FPoint (const real x0, const real y0) : x(x0), y(y0) {};
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FPoint (const FPoint & other) : x(other.x), y(other.y) {};
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FPoint & operator= (const FPoint & other) { x = other.x; y = other.y; return * this; };
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};
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class Matrix {
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real m11, m12, m21, m22, ox, oy;
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public:
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Matrix (const real a11 = 1.0, const real a12 = 0.0, const real a21 = 0.0, const real a22 = -1.0, const real ax = 0, const real ay = 0) :
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m11(a11), m12(a12), m21(a21), m22(a22), ox(ax), oy(ay) {};
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const FPoint operator* (const FPoint & right) const {
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const real x = m11 * right.x + m12 * right.y + ox;
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const real y = m21 * right.x + m22 * right.y + oy;
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const FPoint result (x, y);
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return result;
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}
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};
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union Color {
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struct {
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uint8_t r,g,b,a;
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};
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uint32_t color;
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Color () {color = 0u; };
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Color (const uint8_t rr, const uint8_t gg, const uint8_t bb, const uint8_t aa = 0xFF) : r(rr), g(gg), b(bb), a(aa) {};
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Color (const uint32_t c) : color(c) {};
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Color (const Color & other) { color = other.color; };
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Color & operator= (const Color & other) { color = other.color; return * this; };
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operator uint32_t () const { return color; };
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};
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class Canvas {
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const int width, height;
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Color outpixel;
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Color current;
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Matrix matrix;
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Color * data;
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public:
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Canvas (const int w, const int h);
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~Canvas();
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uint8_t * getData () const { return reinterpret_cast<uint8_t*>(data); };
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size_t getSize () const { return (width * height * sizeof(Color)); };
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int getMaxX () const { return width; };
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int getMaxY () const { return height; };
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void setMatrix (const Matrix & m);
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void fill (const Color & c);
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void setColor (const Color & c) { current = c; };
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void line (const FPoint & begin, const FPoint & end, const bool doted = false);
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void circ (const FPoint & center, const real radius);
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protected:
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Color & at (const int x, const int y);
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bool bound (const int x, const int y) const;
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void line (const int x0, const int y0, const int x1, const int y1, const bool doted = false);
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void rect (const int x0, const int y0, const int x1, const int y1);
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};
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#endif // CANVAS_H
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