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fireworks: closer to a spark

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This commit is contained in:
Vince Weaver 2018-09-05 22:02:29 -04:00
parent b1d8098bee
commit 6f78ca810b
1 changed files with 90 additions and 39 deletions
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129
fireworks/fw.s
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@ -25,23 +25,6 @@ X_OLD = $FD
X_OLDER = $FE
TEMPY = $FF
;signed char o,i;
;void routine_370(void) {
; hplot(xpos+o,ypos_h+o); // NE
; hplot(xpos-o,ypos_h-o); // SW
; hplot(xpos+o,ypos_h-o); // SE
; hplot(xpos-o,ypos_h+o); // NW
; hplot(xpos,ypos_h+(o*1.5)); // N
; hplot(xpos+(o*1.5),ypos_h); // E
; hplot(xpos,ypos_h-(o*1.5)); // S
; hplot(xpos-(o*1.5),ypos_h); // W
;}
draw_fireworks:
@ -296,35 +279,85 @@ done_with_loop:
;==================================
draw_explosion:
jsr random16
lda SEEDL
and #$f
sec
sbc #8
adc X_OLD
sta XPOS_L ; xpos=x_old+(random()%16)-8; x +/- 8
; FIXME: XPOS can overlow
jsr random16
lda SEEDL
and #$f
sec
sbc #8
adc Y_OLD
sta YPOS_H ; ypos_h=y_old+(random()%16)-8; // y +/- 8
; draw white (with fringes)
lda COLOR_GROUP
clc
adc #$3
tax
lda COLORTBL,X ; get color from table
sta HGR_COLOR
; xpos=x_old;
; xpos+=(random()%20)-10; // x +/- 10
;
; ypos_h=y_old;
; ypos_h+=(random()%20)-10; // y +/- 10
;
; hcolor_equals(color_group+3); // draw white (with fringes)
;
; hplot(xpos,ypos_h); // draw at center of explosion
;
; /* Spread the explosion */
; for(i=1;i<=9;i++) {
; /* Draw spreading dots in white */
; HPLOT X,Y: X= (y,x), Y=a
ldx XPOS_L
lda YPOS_H
ldy #0
jsr HPLOT0 ; hplot(x_old,y_old);
; Spread the explosion
ldy #1
sty TEMPY ; save Y
explosion_loop:
ldy TEMPY
;================================
; Draw spreading dots in white
cpy #9
bcc explosion_erase
; if (i<9) {
; o=i;
; hcolor_equals(color_group+3);
; routine_370();
; }
; /* erase old */
; o=i-1;
; hcolor_equals(color_group);
; routine_370();
;
; grsim_update();
; ch=grsim_input();
; if (ch=='q') break;
; usleep(50000);
; }
explosion_erase:
;======================
; erase old
; erase with proper color black (0 or 4)
ldx COLOR_GROUP
lda COLORTBL,X ; get color from table
sta HGR_COLOR
; o=i-1;
jsr explosion
done_with_explosion:
lda #$c0
jsr WAIT
inc TEMPY
lda TEMPY
cmp #9
bne explosion_loop
;==================================
; randomly draw more explosions
@ -342,6 +375,24 @@ done_fireworks:
rts
explosion:
; hplot(xpos+o,ypos_h+o); // NE
; hplot(xpos-o,ypos_h-o); // SW
; hplot(xpos+o,ypos_h-o); // SE
; hplot(xpos-o,ypos_h+o); // NW
; hplot(xpos,ypos_h+(o*1.5)); // N
; hplot(xpos+(o*1.5),ypos_h); // E
; hplot(xpos,ypos_h-(o*1.5)); // S
; hplot(xpos-(o*1.5),ypos_h); // W
rts
;=============================
; Draw the stars
;=============================