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line function works from 2nd quadrant to 4th quadrant

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Ole Morud
2022-06-06 22:15:19 +02:00
parent dff13f512d
commit d91e3525ed
1 changed files with 27 additions and 15 deletions
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42
graphics.c
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@@ -19,7 +19,8 @@ void render(Canvas* c){
for(int i=0; i < c->y; i++){ for(int i=0; i < c->y; i++){
for(int j=0; j < c->x; j++){ for(int j=0; j < c->x; j++){
putchar(c->data[i*(c->x)+j]); putchar(c->data[i*(c->x)+j]);
putchar(' ');
} }
putchar('\n'); putchar('\n');
} }
@@ -39,23 +40,25 @@ void dot(Canvas* c, uint x, uint y){
void line(Canvas* c, uint start_x, uint start_y, uint end_x, uint end_y){ void line(Canvas* c, uint start_x, uint start_y, uint end_x, uint end_y){
#ifndef abs #ifndef abs
#define abs(x) ((x<0)?(-x):(x)) #define abs(x) ((x<0)?(-x):(x))
int dx = abs(end_x - start_x); int dx = abs(end_x - start_x);
int dy = abs(end_y - start_y); int dy = abs(end_y - start_y);
int direction_x = start_x < end_x ? 1 : -1; int direction_x = start_x < end_x ? 1 : -1;
int direction_y = start_y < end_y ? 1 : -1; int direction_y = start_y < end_y ? 1 : -1;
printf("dx:%i dy:%i direction:%i,%i", dx, dy, direction_x, direction_y); printf("dx:%i dy:%i direction:%i,%i \n", dx, dy, direction_x, direction_y);
if(dx>dy){ if(dx>=dy){
for(int i=0; i<dx; i++){ float small = direction_y * (float)dy/(float)dx;
dot(c, start_x+i*direction_x, start_y+(dy/(i+1))*direction_y);
for(int i=0; i<dx+1; i++){
dot(c, start_x + i*direction_x, start_y + i*small);
} }
}else{ }else{
for(int i=0; i<dy; i++){ float small = direction_x * (float)dx/(float)dy;
dot(c, start_x+(dx/(i+1))*direction_x, start_y+i*direction_y);
for(int i=0; i<dy+1; i++){
dot(c, start_x + i*small, start_y + i*direction_y);
} }
} }
@@ -66,16 +69,25 @@ void line(Canvas* c, uint start_x, uint start_y, uint end_x, uint end_y){
int main(){ int main(){
char data[] = char data[] =
"---" "----------"
"---" "----------"
"---"; "----------"
"----------"
"----------"
"----------"
"----------"
"----------"
"----------"
"----------";
Canvas a = {3, 3, data}; Canvas a = {10, 10, data};
//line(&a, 0, 0, 3, 3); //line(&a, 1, 1, 8, 8);
line(&a, 8, 8, 1, 1);
//line(&a, 5, 5, 8, 8);
dot(&a, 0, 0); dot(&a, 0, 0);
dot(&a, 2, 2); dot(&a, 9, 9);
render(&a); render(&a);