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Get basic graph rendering functionality setup and a basic test

This commit is contained in:
Curt Spark 2024-08-02 19:05:33 +01:00
parent b40c175e75
commit 161e5c885a
5 changed files with 46 additions and 29 deletions
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8
lib/bmp.c
View File

@ -84,12 +84,12 @@ bitmap_file init_bitmap_file(const bitmap_header *bitmap_in, const char *filenam
return new_bitmap_file;
};
int write_bitmap_pixel(const bitmap_file *bitmap_file_in, const bitmap_pixel_color *bitmap_pixel_in, const int32_t x_in, const int32_t y_in) {
int write_bitmap_pixel(const bitmap_file bitmap_file_in, const bitmap_pixel_color bitmap_pixel_in, const int32_t x_in, const int32_t y_in) {
int8_t write_status;
int32_t byte_position_start = calc_bitmap_row_byte_position_start(bitmap_file_in->bitmap_metadata, y_in) + ((x_in - 1) * 3);
uint8_t *bitmap_pixel_in_byte_ptr = (uint8_t *)bitmap_pixel_in;
int32_t byte_position_start = calc_bitmap_row_byte_position_start(bitmap_file_in.bitmap_metadata, y_in) + ((x_in - 1) * 3);
uint8_t *bitmap_pixel_in_byte_ptr = (uint8_t *)&bitmap_pixel_in;
write_status = pwrite(bitmap_file_in->fd, bitmap_pixel_in_byte_ptr, 3, bitmap_file_in->bitmap_metadata->image_data_start_offset + byte_position_start);
write_status = pwrite(bitmap_file_in.fd, bitmap_pixel_in_byte_ptr, 3, bitmap_file_in.bitmap_metadata->image_data_start_offset + byte_position_start);
return 0;
};

2
lib/bmp.h
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@ -67,6 +67,6 @@ uint32_t calc_bitmap_pixel_array_size_bytes(const bitmap_header *bitmap_in);
uint32_t calc_bitmap_header_size_bytes();
/* Write bitmap pixel at particular coordinate */
int write_bitmap_pixel(const bitmap_file *bitmap_file_in, const bitmap_pixel_color *bitmap_pixel_in, const int32_t x_in, const int32_t y_in);
int write_bitmap_pixel(const bitmap_file bitmap_file_in, const bitmap_pixel_color bitmap_pixel_in, const int32_t x_in, const int32_t y_in);
#endif

38
lib/grapher.c
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@ -2,26 +2,24 @@
#include "bmp.h"
#include "math.h"
void grapher_draw_line(bitmap_file *bitmap_file_in, int32_t x_origin_in, int32_t y_origin_in, int32_t x_end_in, int32_t y_end_in) {
float x_step = 0;
float y_step = 0;
int32_t x_origin_lerped;
int32_t y_origin_lerped;
bitmap_pixel_color target_pixel;
target_pixel.red = 0;
target_pixel.green = 0;
target_pixel.blue = 0;
void grapher_draw_line_linear(const bitmap_file bitmap_file_in, const bitmap_pixel_color bitmap_pixel_in, int32_t x_origin_in, int32_t y_origin_in, const int32_t x_end_in, const int32_t y_end_in) {
while (x_origin_in < x_end_in || y_origin_in < y_end_in) {
x_origin_lerped = lerp(x_origin_in, x_end_in, x_step);
y_origin_lerped = lerp(y_origin_in, y_end_in, y_step);
x_step += 0.1;
y_step += 0.1;
if (x_step >= 1 || y_step >= 1)
return;
write_bitmap_pixel(bitmap_file_in, &target_pixel, x_origin_in, y_origin_in);
write_bitmap_pixel(bitmap_file_in, bitmap_pixel_in, x_origin_in, y_origin_in);
if (x_origin_in < x_end_in)
x_origin_in++;
if (y_origin_in < y_end_in)
y_origin_in++;
};
};
void grapher_draw_line_lerp(const bitmap_file bitmap_file_in, const bitmap_pixel_color bitmap_pixel_in, int32_t x_origin_in, int32_t y_origin_in, const int32_t x_end_in, const int32_t y_end_in, const float lerp_step_in) {
int32_t x_origin_lerped = 1;
int32_t y_origin_lerped = 1;
float position = 0;
for (position = 0; x_origin_lerped < x_end_in || y_origin_lerped < y_end_in; position += lerp_step_in) {
x_origin_lerped = lerp(x_origin_in, x_end_in, position);
y_origin_lerped = lerp(y_origin_in, y_end_in, position);
write_bitmap_pixel(bitmap_file_in, bitmap_pixel_in, x_origin_lerped, y_origin_lerped);
};
};

3
lib/grapher.h
View File

@ -4,6 +4,7 @@
#include "bmp.h"
#include <stdint.h>
void grapher_draw_line(const bitmap_file *bitmap_file_in, const int32_t x_origin_in, const int32_t y_origin_in, const int32_t x_end_in, const int32_t y_end_in);
void grapher_draw_line_linear(const bitmap_file bitmap_file_in, const bitmap_pixel_color pixel_in, const int32_t x_origin_in, const int32_t y_origin_in, const int32_t x_end_in, const int32_t y_end_in);
void grapher_draw_line_lerp(const bitmap_file bitmap_file_in, const bitmap_pixel_color bitmap_pixel_in, int32_t x_origin_in, int32_t y_origin_in, const int32_t x_end_in, const int32_t y_end_in, const float lerp_step_in);
#endif

24
main.c
View File

@ -59,13 +59,31 @@ int main() {
/* Simple skybox generator */
target_pixel.red = ((float)height / (float)test_file.bitmap_metadata->image_height) * 255;
target_pixel.green = ((float)height / (float)test_file.bitmap_metadata->image_height) * 255;
target_pixel.blue = 255;
target_pixel.blue = 150;
write_bitmap_pixel(&test_file, &target_pixel, width, height);
write_bitmap_pixel(test_file, target_pixel, width, height);
}
}
grapher_draw_line(&test_file, 50, 50, 200, 50);
target_pixel.red = 255;
target_pixel.green = 0;
target_pixel.blue = 0;
grapher_draw_line_lerp(test_file, target_pixel, 10, 10, 100, 245, 0.01);
target_pixel.red = 0;
target_pixel.green = 255;
target_pixel.blue = 0;
grapher_draw_line_lerp(test_file, target_pixel, 10, 10, 245, 245, 0.01);
target_pixel.red = 0;
target_pixel.green = 0;
target_pixel.blue = 255;
grapher_draw_line_lerp(test_file, target_pixel, 10, 10, 245, 100, 0.01);
/* Draw graph */
target_pixel.red = 0;
target_pixel.green = 0;
target_pixel.blue = 0;
grapher_draw_line_linear(test_file, target_pixel, 10, 10, 245, 10);
grapher_draw_line_linear(test_file, target_pixel, 10, 10, 10, 245);
close(test_file.fd);