96 lines
1.5 KiB
C
96 lines
1.5 KiB
C
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#include <stdio.h>
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#define uint unsigned int
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#define ON 'x'
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#define OFF '-'
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typedef struct Canvas {
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int x;
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int y;
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char* data;
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} Canvas;
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/*
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* Draws an x*y rectangle with the characters in canvas* c
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*/
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void render(Canvas* c){
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putchar('\n');
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for(int i=0; i < c->y; i++){
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for(int j=0; j < c->x; j++){
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putchar(c->data[i*(c->x)+j]);
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putchar(' ');
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}
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putchar('\n');
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}
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}
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/*
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* Sets pixel at x,y to ON
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*/
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void dot(Canvas* c, uint x, uint y){
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c->data[ y*(c->x) + x] = ON;
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}
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/*
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* Draws a line from (start_x, start_y) to (end_x, end_y)
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*/
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void line(Canvas* c, uint start_x, uint start_y, uint end_x, uint end_y){
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#ifndef abs
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#define abs(x) ((x<0)?(-x):(x))
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int dx = abs(end_x - start_x);
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int dy = abs(end_y - start_y);
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int direction_x = start_x < end_x ? 1 : -1;
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int direction_y = start_y < end_y ? 1 : -1;
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printf("dx:%i dy:%i direction:%i,%i \n", dx, dy, direction_x, direction_y);
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if(dx>=dy){
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float small = direction_y * (float)dy/(float)dx;
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for(int i=0; i<dx+1; i++){
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dot(c, start_x + i*direction_x, start_y + i*small);
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}
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}else{
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float small = direction_x * (float)dx/(float)dy;
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for(int i=0; i<dy+1; i++){
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dot(c, start_x + i*small, start_y + i*direction_y);
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}
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}
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#undef abs
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#endif
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}
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int main(){
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char data[] =
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"----------"
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"----------"
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"----------"
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"----------"
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"----------"
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"----------"
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"----------"
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"----------"
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"----------"
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"----------";
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Canvas a = {10, 10, data};
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//line(&a, 1, 1, 8, 8);
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line(&a, 8, 8, 1, 1);
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//line(&a, 5, 5, 8, 8);
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dot(&a, 0, 0);
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dot(&a, 9, 9);
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render(&a);
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return 0;
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}
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