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Routines |
Prev: 7301 | Up: Map |
Continues from the routine at 740A. Returns with the carry flag set if the speech bubble is off-screen.
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7302 | LD E,A | E=ASCII code of the character from the message being spoken | ||||||||
7303 | LD A,($7F64) | Copy the speech bubble lip x-coordinate from 7F64 to A | ||||||||
7306 | AND $78 | A=x-coordinate of the right edge of the text window within the speech bubble | ||||||||
7308 | ADD A,$06 | |||||||||
730A | LD HL,$7F00 | 7F00 holds the leftmost column of the skool on screen (0-64) | ||||||||
730D | SUB (HL) | Return with the carry flag set if the speech bubble is off-screen to the left | ||||||||
730E | RET C | |||||||||
730F | CP $20 | Return with the carry flag set if the speech bubble is off-screen to the right | ||||||||
7311 | CCF | |||||||||
7312 | RET C | |||||||||
The speech bubble is on screen.
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7313 | LD C,A | C=screen x-coordinate of the right edge of the text window within the speech bubble (6, 14, 22 or 30) | ||||||||
7314 | LD A,($7F65) | A=y-coordinate of the speech bubble lip | ||||||||
7317 | SUB $9A | D=screen y-coordinate of the top row of the speech bubble (0-17) | ||||||||
7319 | LD D,A | |||||||||
731A | RRCA | Set HL to the display file address corresponding to the top right edge of the text window within the speech bubble | ||||||||
731B | RRCA | |||||||||
731C | RRCA | |||||||||
731D | AND $E0 | |||||||||
731F | ADD A,C | |||||||||
7320 | LD L,A | |||||||||
7321 | LD A,D | |||||||||
7322 | AND $18 | |||||||||
7324 | ADD A,$44 | |||||||||
7326 | LD H,A | |||||||||
7327 | LD D,$D9 | C=width (in pixels) of the message character bitmap | ||||||||
7329 | LD A,(DE) | |||||||||
732A | LD C,A | |||||||||
Now we enter a loop to slide the pixel columns of the message character bitmap into the text window of the speech bubble.
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732B | INC D | A=next pixel column of the message character bitmap | ||||||||
732C | LD A,(DE) | |||||||||
732D | CALL $7333 | Slide this into the speech bubble text window | ||||||||
7330 | DEC C | Next pixel column | ||||||||
7331 | JR NZ,$732B | Jump back until all pixel columns are done | ||||||||
7333 | PUSH HL | Store the display file address temporarily | ||||||||
7334 | CALL $7DD8 | Slide the top four pixel rows of the text window one pixel to the left | ||||||||
7337 | LD B,A | Store the message character pixel column in B temporarily | ||||||||
7338 | LD A,L | Set HL to the display file address corresponding to the fifth pixel row down from the top right edge of the text window within the speech bubble | ||||||||
7339 | ADD A,$20 | |||||||||
733B | LD L,A | |||||||||
733C | JR C,$7342 | |||||||||
733E | LD A,H | |||||||||
733F | SUB $08 | |||||||||
7341 | LD H,A | |||||||||
7342 | LD A,B | Restore the message character pixel column to A | ||||||||
7343 | CALL $7DD8 | Slide the bottom four pixel rows of the text window one pixel to the left | ||||||||
7346 | POP HL | Restore the display file address to HL | ||||||||
7347 | XOR A | Reset the carry flag | ||||||||
7348 | RET |
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