125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
#pragma once
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#include <stdint.h>
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#include "../datatypes.cpp"
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#include "../helpers.cpp"
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#include "../buffer.cpp"
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namespace UwU {
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class Triangle {
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private:
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public:
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Triangle(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2) {
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this->x0 = x0;
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this->y0 = y0;
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this->x1 = x1;
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this->y1 = y1;
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this->x2 = x2;
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this->y2 = y2;
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}
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Triangle() {}
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uint16_t x0;
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uint16_t y0;
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uint16_t x1;
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uint16_t y1;
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uint16_t x2;
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uint16_t y2;
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// Draw a triangle
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void draw (Buffer buffer, Color color) {
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Coord2 top = Coord2();
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Coord2 mid = Coord2();
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Coord2 btm = Coord2();
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// cases: left-handed, right-handed
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if (y0 <= y1 && y0 <= y2) {
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top.x = x0;
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top.y = y0;
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if (y1 < y2) {
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mid.x = x1;
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mid.y = y1;
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btm.x = x2;
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btm.y = y2;
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} else {
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mid.x = x2;
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mid.y = y2;
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btm.x = x1;
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btm.y = y1;
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}
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} else if (y1 <= y0 && y1 <= y2) {
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top.x = x1;
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top.y = y1;
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if (y0 < y2) {
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mid.x = x0;
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mid.y = y0;
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btm.x = x2;
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btm.y = y2;
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} else {
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mid.x = x2;
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mid.y = y2;
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btm.x = x0;
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btm.y = y0;
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}
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} else {
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top.x = x2;
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top.y = y2;
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if (y0 < y1) {
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mid.y = y0;
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mid.x = x0;
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btm.x = x1;
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btm.y = y1;
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} else {
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mid.x = x1;
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mid.y = y1;
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btm.x = x0;
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btm.y = y0;
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}
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}
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// printf("top: (%u, %u)\n", top.x, top.y);
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// printf("mid: (%u, %u)\n", mid.x, mid.y);
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// printf("btm: (%u, %u)\n", btm.x, btm.y);
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uint16_t height = 1 + btm.y - top.y;
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int16_t longBound[height];
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int16_t splitBound[height];
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// int16_t rightBound[height];
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Helpers::bresenham(0, top.x, height - 1, btm.x, longBound);
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// printf("longBound\n");
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if ((int16_t)mid.x < longBound[mid.y - top.y]) {
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// left-handed triangle
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// printf("left-handed\n");
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// rightBound = longBound;
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Helpers::bresenham(0, top.x, mid.y - top.y, mid.x, splitBound);
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// printf("splitTop\n");
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Helpers::bresenham(mid.y - top.y, mid.x, height - 1, btm.x, splitBound);
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// printf("splitBtm\n");
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// for (uint16_t i = 0; i < height; i++) {
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// printf("(%u, %u)\n", i, splitBound[i]);
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// }
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for (uint16_t i = 0; i < height; i++) {
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for (uint16_t x = (uint16_t)splitBound[i]; x <= (uint16_t)longBound[i]; x++) {
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// Helpers::putPixel(buffer, x, i + (uint32_t)top.y, color.r, color.g, color.b, color.a);
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buffer.drawPixel(x, i + (uint16_t)top.y, color);
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}
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}
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} else {
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// right-handed triangle
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// printf("right-handed\n");
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// leftBound = longBound;
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Helpers::bresenham(0, top.x, mid.y - top.y, mid.x, splitBound);
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// printf("splitTop\n");
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Helpers::bresenham(mid.y - top.y, mid.x, height - 1, btm.x, splitBound);
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// printf("splitBtm\n");
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for (uint16_t i = 0; i < height; i++) {
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for (uint16_t x = (uint16_t)longBound[i]; x <= (uint16_t)splitBound[i]; x++) {
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// Helpers::putPixel(buffer, x, i + (uint32_t)top.y, color.r, color.g, color.b, color.a);
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buffer.drawPixel(x, i + (uint16_t)top.y, color);
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}
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}
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}
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return;
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}
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};
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} |