93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
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#include "libwasm.h"
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#include "canvas.h"
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int round (const double a) {
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return int (a + 0.5);
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}
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Canvas::Canvas(const int w, const int h) : width(w), height(h),
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outpixel(0u), current(0xFF000000), matrix (1.0, 0.0, 0.0, -1.0, 0.5 * (real) w, 0.5 * (real) (h)) {
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data = new Color [w * h];
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}
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Canvas::~Canvas() {
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delete [] data;
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}
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void Canvas::fill (const Color & c) {
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for (int y=0; y<height; y++) {
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for (int x=0; x<width; x++) {
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at (x, y) = c;
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}
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}
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}
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Color & Canvas::at (const int x, const int y) {
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if (!bound(x, y)) return outpixel;
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const int result = x + y * width;
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return data [result];
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}
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bool Canvas::bound (const int x, const int y) const {
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if (x < 0) return false;
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if (y < 0) return false;
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if (x >= width) return false;
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if (y >= height) return false;
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return true;
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}
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void Canvas::line (const int xp, const int yp, const int xe, const int ye, const bool doted) {
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bool dot = true;
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int x1 = xp, y1 = yp;
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const int x2 = xe, y2 = ye;
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bool done = false;
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int mx = 0, my = 0;
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// Determine direction and distance
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const int xd = (x1 < x2) ? 1 : -1;
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const int yd = (y1 < y2) ? 1 : -1;
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const int xl = (x1 < x2) ? (x2 - x1) : (x1 - x2);
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const int yl = (y1 < y2) ? (y2 - y1) : (y1 - y2);
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while (!done) {
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if (x1 == x2 && y1 == y2) done = true;
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if (dot) at(x1,y1) = current; // Plot pixel
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if (doted) dot = !dot;
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mx += xl;
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if (x1 != x2 && mx > yl) x1 += xd, mx -= yl;
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my += yl;
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if (y1 != y2 && my > xl) y1 += yd, my -= xl;
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}
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}
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void Canvas::rect (const int x0, const int y0, const int x1, const int y1) {
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for (int y=y0; y<y1; y++) {
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for (int x=x0; x<x1; x++) {
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at(x, y) = current;
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}
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}
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}
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void Canvas::line (const FPoint & begin, const FPoint & end, const bool doted) {
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const FPoint b (matrix * begin);
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const FPoint e (matrix * end );
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const int x0 = (const int) round (b.x);
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const int y0 = (const int) round (b.y);
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const int x1 = (const int) round (e.x);
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const int y1 = (const int) round (e.y);
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// printf("%d:%d - %d:%d\n", x0, y0, x1, y1);
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line (x0, y0, x1, y1, doted);
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}
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void Canvas::circ (const FPoint & center, const real radius) {
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if (radius == 0) return;
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double x = radius, y = 0.0;
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const double dx = 1.0 / radius;
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const double ms = radius * 6.3;
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real count = 0.0;
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// kruh se da nakreslit i bez sin a cos, rychle ale trochu nepresne
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for (;;) {
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x += y * dx; y -= x * dx;
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const FPoint e (center.x + x, center.y + y);
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const FPoint t (matrix * e);
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at ((int) round (t.x), (int) round (t.y)) = current;
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count += 1.0;
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if (count > ms) break;
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}
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}
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void Canvas::setMatrix (const Matrix& m) {
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matrix = m;
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}
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