218 lines
7.0 KiB
C++
218 lines
7.0 KiB
C++
/* Example program that links against the waymini library.
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* No external dependencies beyond waymini itself and the C standard library.
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*/
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#include "waymini.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// this should be handled elsewhere, eventually, maybe, probably
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static void on_key(void *user, uint32_t keycode, uint32_t state) {
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(void)user;
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const char *label = state ? "down" : "up ";
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printf("key %s: %u\n", label, keycode);
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fflush(stdout);
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}
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namespace UwU {
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// Color datatype returns individual channel values from rgba hexcode
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struct Color {
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Color(uint32_t hex) {
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this->a = hex & 0x000000ff;
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this->b = (hex & 0x0000ff00) >> 8;
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this->g = (hex & 0x00ff0000) >> 16;
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this->r = (hex & 0xff000000) >> 24;
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}
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uint8_t r;
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uint8_t g;
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uint8_t b;
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uint8_t a;
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};
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// Coord2 datatype for xy coordinates, from top-left of surface
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struct Coord2 {
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Coord2(uint32_t x, uint32_t y) {
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this->x = x;
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this->y = y;
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}
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uint32_t x;
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uint32_t y;
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};
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class Draw {
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private:
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// plot lines if m<= 1
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void lineLow(int32_t x0, int32_t y0, int32_t x1, int32_t y1, Color color) {
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int32_t dx = x1 - x0;
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int32_t dy = y1 - y0;
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int32_t yi = 1;
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if (dy < 0) {
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yi = -1;
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dy = -dy;
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}
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int32_t d = (2 * dy) - dx;
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int32_t y = y0;
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for (int32_t x = x0; x < x1; x++) {
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size_t i = (size_t)y * waymini_get_stride(this->wm) + (size_t)x * 4;
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this->pixels[i + 0] = color.b; // B
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this->pixels[i + 1] = color.g; // G
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this->pixels[i + 2] = color.r; // R
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this->pixels[i + 3] = 0xFF; // A
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if (d > 0) {
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y += yi;
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d += (2 * (dy - dx));
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} else {
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d += (2 * dy);
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}
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}
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return;
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}
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// plot lines if m<= 1
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void lineHigh(int32_t x0, int32_t y0, int32_t x1, int32_t y1, Color color) {
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int32_t dx = x1 - x0;
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int32_t dy = y1 - y0;
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int32_t xi = 1;
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if (dx < 0) {
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xi = -1;
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dx = -dx;
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}
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int32_t d = (2 * dx) - dy;
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int32_t x = x0;
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for (int32_t y = y0; y < y1; y++) {
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size_t i = (size_t)y * waymini_get_stride(this->wm) + (size_t)x * 4;
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this->pixels[i + 0] = color.b; // B
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this->pixels[i + 1] = color.g; // G
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this->pixels[i + 2] = color.r; // R
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this->pixels[i + 3] = 0xFF; // A
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if (d > 0) {
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x += xi;
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d += (2 * (dx - dy));
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} else {
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d += (2 * dx);
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}
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}
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return;
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}
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public:
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struct waymini* wm;
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uint32_t width;
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uint32_t height;
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uint32_t stride;
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uint8_t *pixels;
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Draw(uint32_t width, uint32_t height, waymini_key_cb on_key) {
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this->wm = waymini_create(width, height, on_key, NULL);
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if (!this->wm) exit(1);
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this->width = waymini_get_width(this->wm);
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this->height = waymini_get_height(this->wm);
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this->stride = waymini_get_stride(this->wm);
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printf("surface: %ux%u stride=%u\n", this->width, this->height, this->stride);
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this->pixels = (uint8_t *)waymini_get_pixels(this->wm);
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if (!this->pixels) {
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waymini_destroy(this->wm);
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exit(1);
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}
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}
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// Draw a rectangle (duh)
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void rectangle(Coord2 point0, Coord2 point1, Color color) {
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if (point0.x > this->width || point0.y > this->height || point1.x > this->width || point1.y > this->height) {return;};
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for (uint32_t y = point0.y; y < point1.y; y++) {
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for (uint32_t x = point0.x; x < point1.x; x++) {
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size_t i = (size_t)y * waymini_get_stride(this->wm) + (size_t)x * 4;
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this->pixels[i + 0] = color.b; // B
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this->pixels[i + 1] = color.g; // G
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this->pixels[i + 2] = color.r; // R
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this->pixels[i + 3] = 0xFF; // A
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}
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}
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return;
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}
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// Fill a simple gradient. Each row is stride bytes.
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void rainbow() {
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for (uint32_t y = 0; y < this->height; y++) {
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for (uint32_t x = 0; x < this->width; x++) {
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size_t i = (size_t)y * waymini_get_stride(this->wm) + (size_t)x * 4;
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this->pixels[i + 0] = (uint8_t)(y * 255 / this->height); // B
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this->pixels[i + 1] = 0x00; // G
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this->pixels[i + 2] = (uint8_t)(x * 255 / this->width); // R
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this->pixels[i + 3] = 0xFF; // A
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}
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}
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}
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// Draw a single point
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void point (Coord2 point, Color color) {
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if (point.x > this->width || point.y > this->height) {return;};
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size_t i = (size_t)point.y * waymini_get_stride(this->wm) + (size_t)point.x * 4;
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this->pixels[i + 0] = color.b; // B
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this->pixels[i + 1] = color.g; // G
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this->pixels[i + 2] = color.r; // R
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this->pixels[i + 3] = 0xFF; // A
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}
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// Uses Bresenham's line algorithm to draw line of any slope
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void line (Coord2 point0, Coord2 point1, Color color) {
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if (point0.x > this->width || point0.y > this->height || point1.x > this->width || point1.y > this->height) {return;};
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int32_t x0 = (int32_t)point0.x;
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int32_t y0 = (int32_t)point0.y;
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int32_t x1 = (int32_t)point1.x;
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int32_t y1 = (int32_t)point1.y;
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if (abs(y1 - y0) < abs(x1 - x0)) {
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if (x0 > x1) {
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this->lineLow(x1, y1, x0, y0, color);
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} else {
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this->lineLow(x0, y0, x1, y1, color);
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}
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} else {
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if (y0 > y1) {
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this->lineHigh(x1, y1, x0, y0, color);
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} else {
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this->lineHigh(x0, y0, x1, y1, color);
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}
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}
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}
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};
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}
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int main(void) {
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uint32_t w = 800, h = 480;
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UwU::Color fuchsia = UwU::Color(0xb00b69ff);
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UwU::Color green = UwU::Color(0x00ff00ff);
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printf("r: %u, g:%u, b:%u, a:%u\n", fuchsia.r, fuchsia.g, fuchsia.b, fuchsia.a);
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// struct waymini *wm = waymini_create(w, h, on_key, NULL);
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UwU::Draw draw = UwU::Draw(w, h, on_key);
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draw.rainbow();
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waymini_present(draw.wm);
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draw.rectangle(UwU::Coord2(69, 69), UwU::Coord2(420, 420), fuchsia);
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draw.point(UwU::Coord2(387, 43), green);
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draw.line(UwU::Coord2(300, 100), UwU::Coord2(250, 469), green);
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draw.line(UwU::Coord2(250, 100), UwU::Coord2(300, 469), green);
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draw.line(UwU::Coord2(300, 100), UwU::Coord2(469, 250), green);
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draw.line(UwU::Coord2(469, 100), UwU::Coord2(300, 250), green);
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draw.line(UwU::Coord2(100, 300), UwU::Coord2(250, 469), green);
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draw.line(UwU::Coord2(250, 300), UwU::Coord2(100, 469), green);
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draw.line(UwU::Coord2(100, 300), UwU::Coord2(469, 250), green);
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draw.line(UwU::Coord2(469, 300), UwU::Coord2(100, 250), green);
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while (!waymini_should_close(draw.wm)) {
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if (waymini_dispatch(draw.wm) < 0) break;
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}
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waymini_destroy(draw.wm);
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return 0;
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}
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