mirror of
https://github.com/isometimes/rpi4-osdev
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110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
#include "../include/wgt.h"
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void wellipse (short x_center, short y_center, short x_radius, short y_radius)
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{
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short x, y;
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long aa, aa2, bb, bb2, d, dx, dy;
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x = 0;
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y = y_radius;
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aa = (int)x_radius * (int)x_radius;
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aa2 = 2 * aa;
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bb = (int)y_radius * (int)y_radius;
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bb2 = 2 * bb;
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d = bb - aa * (int)y_radius + aa / 4;
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dx = 0;
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dy = aa2 * (int)y_radius;
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wputpixel (x_center, y_center - y);
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wputpixel (x_center, y_center + y);
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wputpixel (x_center - x_radius, y_center);
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wputpixel (x_center + x_radius, y_center);
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while (dx < dy)
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{
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if (d > 0)
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{
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y--;
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dy -= aa2;
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d -= dy;
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}
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x++;
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dx += bb2;
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d += bb + dx;
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wputpixel (x_center + x, y_center + y);
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wputpixel (x_center - x, y_center + y);
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wputpixel (x_center + x, y_center - y);
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wputpixel (x_center - x, y_center - y);
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}
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d += (3 * (aa - bb) / 2 - (dx + dy)) / 2;
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while (y > 0)
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{
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if (d < 0)
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{
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x++;
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dx += bb2;
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d += bb + dx;
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}
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y--; dy -= aa2; d += aa - dy;
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wputpixel (x_center + x, y_center + y);
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wputpixel (x_center - x, y_center + y);
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wputpixel (x_center + x, y_center - y);
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wputpixel (x_center - x, y_center - y);
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}
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}
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void wfill_ellipse (short x_center, short y_center, short x_radius, short y_radius)
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{
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short x, y;
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long aa, aa2, bb, bb2, d, dx, dy;
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x = 0;
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y = y_radius;
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aa = (int)x_radius * (int)x_radius;
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aa2 = 2 * aa;
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bb = (int)y_radius * (int)y_radius;
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bb2 = 2 * bb;
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d = bb - aa * (int)y_radius + aa / 4;
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dx = 0;
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dy = aa2 * (int)y_radius;
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while (dx < dy)
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{
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if (d > 0)
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{
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wline (x_center + x, y_center + y, x_center - x, y_center + y);
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wline (x_center + x, y_center - y, x_center - x, y_center - y);
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y--;
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dy -= aa2;
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d -= dy;
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}
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x++;
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dx += bb2;
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d += bb + dx;
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}
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wline (x_center + x, y_center + y, x_center - x, y_center + y);
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wline (x_center + x, y_center - y, x_center - x, y_center - y);
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d += (3 * (aa - bb) / 2 - (dx + dy)) / 2;
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while (y > 0)
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{
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if (d < 0)
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{
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x++;
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dx += bb2;
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d += bb + dx;
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}
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y--;
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dy -= aa2;
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d += aa - dy;
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wline (x_center + x, y_center + y, x_center - x, y_center + y);
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wline (x_center + x, y_center - y, x_center - x, y_center - y);
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}
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}
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