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Fixed line drawing

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This commit is contained in:
jespergravgaard 2021-04-03 21:45:29 +02:00
parent ad92cea393
commit 3a2e795918
1 changed files with 6 additions and 6 deletions
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12
src/test/kc/examples/mega65/linedrawing.c
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@ -128,12 +128,12 @@ void main() {
draw_line(160, 100, 319, 0, 4);
*/
for(int x1=0;x1<320;x1+=10) {
for(int x1=0;x1<320;x1+=11) {
draw_line(x1, 0, 160, 199, 5);
draw_line(160, 0, x1, 199, 5);
}
for(int y1=0;y1<200;y1+=10) {
for(int y1=0;y1<200;y1+=11) {
draw_line(0, y1, 319, 100, 6);
draw_line(0, 100, 319, y1, 6);
}
@ -217,8 +217,8 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
}
// Use hardware divider to get the slope
*MATH_MULTINA_INT0 = dx;
*MATH_MULTINB_INT0 = dy;
*MATH_MULTINA_INT0 = dx*2+1;
*MATH_MULTINB_INT0 = dy*2;
*MATH_MULTINA_INT1 = 0;
*MATH_MULTINB_INT1 = 0;
@ -249,8 +249,8 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
}
// Use hardware divider to get the slope
*MATH_MULTINA_INT0 = dy;
*MATH_MULTINB_INT0 = dx;
*MATH_MULTINA_INT0 = dy*2+1;
*MATH_MULTINB_INT0 = dx*2;
*MATH_MULTINA_INT1 = 0;
*MATH_MULTINB_INT1 = 0;