Cow Game
Adventures of a Cow
Introduction
Peter has taken the Simple DirectMedia Layer software in his stride and has produced for
his first SDL game the entertaining Adventures of a Cow. This five-level platform
game features the appropriate use of a range of SDL functions. Examples of these functions
and their uses are:
- SDL_PumpEvents - gathers all the pending input information from devices and place it on the event queue
- SDL_PollEvent - checks for an event such as the press of a key or a mouse button
- SDL_GetKeyState - reads the keyboard
- SDL_BlitSurface - copies images
- SDL_FillRect - creates a different background colour for each level
- filledPolygonColor (in the SDL_gfx library) - draws the background
- rotozoomSurface (in the SDL_gfx library) - angles the cow at right angles to the ground to be more realistic when walking/running uphill and downhill
The robust code is helpfully commented and should prove to be useful for reference.
Start the game by double clicking the level you have reached on the opening screen then control the cow with the arrow keys. Watch those legs move! In Level One you need to avoid being crushed by large jumping elephants:
Eventually, you reach the cup:
Level One in action
Reaching the cup
Later levels introduce cliffs over a poisonous sea and bomb-dropping blimps. The following is a screenshot from Level Four. The reviewer is not prepared to disclose how many attempts he took to reach this level without cheating! See if you can work out from the code how to use key presses to use the built-in cheat mechanism to start at an advanced level.
Level Four in action
Download here a zip file containing the main code (cowgame.txt) and a folder named associatedFiles containing images and a text file to record the level status. You should unzip the files so that associatedFiles is in the program folder. In order to run the program you will need to use SDL files and additional libraries. (See Getting Started with SDL for download details of SDL.dll, SDL.pas) and other Pascal header files.
The program requires the libraries SDL.dll, SDL_gfx.dll and SDL_image.dll. You can put these files in the program folder or with thousands of other libraries in your system folder. Download SDL_gfx.dll from the Freepascal meets SDL site. SDL_image-1.2.10-win32.zip from the SDL_image 1.2 page on the SDL site contains SDL_image.dll.
The Program
program CowGame; { Copyright (c) 2011 Peter Hearnshaw Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License, as described at http://www.apache.org/licenses/ and http://www.pp4s.co.uk/licenses/ } {$APPTYPE GUI} uses CRT, SDL, SDL_IMAGE, SDL_GFX, sdlutils, strutils, SysUtils, Math; type TElephant = record relavtiveX : integer; EleGravity : real; ypos : integer; end; type TBomb = record dropping : boolean; Xpos : integer; Ypos : integer; gravity : real; droppedAtX : integer; end; var rotated_width, rotated_height, newCowHeight, IntCheat : integer; screen, picture, rotatedPicture, MainMenu, cup, levelDone, died, ele, sea, blimp, bomb, MainMenu1, MainMenu2, MainMenu3, MainMenu4, MainMenu5, walk1R, walk2R, walk3R, walk4R, walk5R, walk1L, walk2L, walk3L, walk4L, walk5L, stoodL, stoodR, jumpR, jumpL : pSDL_SURFACE; myEvent, gameEvent: TSDL_Event; leaveProg, leaveDiedScreen, leaveDoneLevelScreen: boolean; SrcRect, mainMenuRect, CupRect, LevelDoneRect, diedRect, ElephRect, seaRect, blimpRect, offset, bombRect : TSDL_Rect; allBombs: array [1 .. 5] of TBomb; positionOfCup, positionOfEle, positionOfSea, blimpXpos, bombId, newestLevelUnlocked, walkingStage : integer; escape, hasDied : boolean; cowFacingDirection : string; landValues: array [1 .. 5, 1 .. 1300] of integer = ((50, 50, 51, 52, 52, 51, 49, 48, 48, 47, 45, 42, 38, 35, 33, 30, 27, 25, 23, 21, 20, 18, 17, 17, 19, 21, 22, 22, 21, 21, 20, 20, 20, 20, 20, 21, 21, 22, 24, 27, 29, 30, 32, 35, 37, 40, 43, 47, 50, 52, 54, 55, 57, 59, 61, 64, 66, 68, 71, 75, 80, 84, 88, 91, 94, 97, 98, 98, 97, 96, 94, 90, 87, 84, 80, 75, 70, 66, 63, 60, 58, 55, 52, 48, 43, 37, 32, 28, 24, 19, 15, 13, 11, 10, 12, 14, 17, 20, 22, 24, 26, 28, 29, 30, 30, 30, 31, 31, 31, 31, 32, 34, 36, 38, 40, 43, 45, 46, 47, 47, 47, 46, 45, 43, 40, 38, 37, 35, 34, 34, 33, 32, 32, 32, 31, 29, 28, 26, 23, 20, 17, 14, 12, 12, 14, 16, 19, 23, 28, 32, 36, 40, 45, 49, 52, 56, 61, 66, 70, 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36, 35, 36, 35, 32, 33, 30, 29, 30, 33, 37, 45, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 150, 144, 133, 128, 123, 121, 122, 125, 131, 136, 141, 142, 139, 139, 135, 132, 132, 129, 126, 127, 129, 130, 134, 137, 141, 147, 149, 151, 154, 153, 152, 147, 140, 135, 132, 131, 133, 137, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140)); levelArrLengthsArr : array [1 .. 5] of integer = (800, 800, 500, 800, 1300); i, a, backgroundX : integer; gravity : real; seaPositions : array[1 .. 5, 1 .. 26] of integer = ((0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), (1946, 2600, 2876, 4500, 4776, 6800, 7076, 9600, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), (932, 2777, 3080, 3356, 3632, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), (1160, 1490, 1766, 2612, 2888, 3164, 3440, 4196, 4472, 4724, 5000, 5648, 5924, 6200, 6476, 7298, 7574, 7850, 8222, 8498, 8684, 8960, 9236, 9476, 9752, 10028), (929, 1205, 1919, 3668, 4300, 4576, 5340, 5616, 6737, 7013, 9311, 9587, 10763, 11039, 14558, 14834, 16700, 16976, 0, 0, 0, 0, 0, 0, 0, 0)); keystates : PUint8; gradY1, gradY2 : integer; rotation : real; newangle_value, angle_value, zoom_value : double; onGround : boolean = False; blimpChance : array [1 .. 5] of integer = (0, 0, 500, 250, 100); key : Uint32; x_array2 : array[0 .. 200] of SINT16; y_array2 : array[0 .. 200] of SINT16; levelArrLength : integer = 800; allElephants : array[1 .. 5, 1 .. 14] of TElephant; blimpRunning : boolean = False; const COWLENGTH = 52; COWHEIGHT = 32; function checkNewestUnlockedLevel : integer; var f: Text; strValue: string; begin assignFile(f, 'associatedFiles\programData.txt'); reset(f); readln(f, strValue); Close(f); checkNewestUnlockedLevel := StrToInt(strValue); end; procedure setNewestUnlockedLevel(newValue: integer); var f : Text; begin assignFile(f, 'associatedFiles\programData.txt'); rewrite(f); Write(f, IntToStr(newValue)); Close(f); end; procedure drawBackground(thisLevelArrLength: integer; levelNum: integer); var a : integer; begin a := 1; i := 2; while i < thisLevelArrLength do begin Inc(i); if ((i * 15) + backgroundX < 500) and (((i * 15) + backgroundX > 0)) then //only draw what is inside the screen (which is 500px across) begin if ((((i - 1) * 15) + backgroundX <= 0)) then //this is the first on screen i value begin //after this code is run, the y value will be plotted again but at x value (i*15)+backgroundX x_array2[a] := 0; y_array2[a] := landValues[levelNum][i] + 300; Inc(a); end; if ((((i + 1) * 15) + backgroundX >= 500)) then //this is the last on screen i value begin x_array2[a] := 500; y_array2[a] := landValues[levelNum][i] + 300; Inc(a); end else begin //this runs a lot because it is how points on the polygon are plotted to make up the land x_array2[a] := (i * 15) + backgroundX; y_array2[a] := landValues[levelNum][i] + 300; Inc(a); x_array2[a] := (i * 15) + backgroundX + 7; y_array2[a] := round( (landValues[levelNum][i] + landValues[levelNum][i + 1]) / 2) + 300; Inc(a); end; end; end; x_array2[a] := 500; y_array2[a] := 500; Inc(a); x_array2[a] := 0; y_array2[a] := 500; Inc(a); x_array2[a] := x_array2[0]; y_array2[a] := y_array2[0]; case levelNum of 1 : FILLEDPOLYGONCOLOR(screen, @x_array2[0], @y_array2[0], round(500 / 7) + 30, $6FFF2FFF); 2 : FILLEDPOLYGONCOLOR(screen, @x_array2[0], @y_array2[0], round(500 / 7) + 30, $9ACD32FF); 3 : FILLEDPOLYGONCOLOR(screen, @x_array2[0], @y_array2[0], round(500 / 7) + 30, $7171C6FF); 4 : FILLEDPOLYGONCOLOR(screen, @x_array2[0], @y_array2[0], round(500 / 7) + 30, $C0FF3EFF); 5 : FILLEDPOLYGONCOLOR(screen, @x_array2[0], @y_array2[0], round(500 / 7) + 30, $CD853FFF); end; end; procedure SETUPWINDOW; begin SDL_INIT(SDL_INIT_VIDEO); screen := SDL_SETVIDEOMODE(500, 500, 32, SDL_SWSURFACE); SDL_WM_SetCaption('Adventures of a Cow', nil); end; procedure LOADLEVEL(levelNum: integer); begin //reset all our variables when we enter a level backgroundX := -500; SrcRect.x := 250 - round(COWLENGTH / 2); SrcRect.y := landValues[levelNum][-round((backgroundX - 250) / 15)] + 300 - COWHEIGHT; SrcRect.w := COWLENGTH; SrcRect.h := COWHEIGHT; CupRect.x := 0; CupRect.y := 0; CupRect.w := 154; CupRect.h := 205; ElephRect.x := 0; ElephRect.y := 0; ElephRect.w := 139; ElephRect.h := 90; seaRect.x := 0; seaRect.y := 0; seaRect.w := 276; seaRect.h := 77; blimpRect.x := 0; blimpRect.y := 0; blimpRect.w := 266; blimpRect.h := 83; bombRect.x := 0; bombRect.y := 0; bombRect.w := 8; bombRect.h := 8; blimpRunning := False; rotated_width := COWLENGTH; rotated_height := COWHEIGHT; walk1R := SDL_LOADBMP('associatedFiles\walk1R.bmp'); walk2R := SDL_LOADBMP('associatedFiles\walk2R.bmp'); walk3R := SDL_LOADBMP('associatedFiles\walk3R.bmp'); walk4R := SDL_LOADBMP('associatedFiles\walk4R.bmp'); walk5R := SDL_LOADBMP('associatedFiles\walk5R.bmp'); walk1L := SDL_LOADBMP('associatedFiles\walk1L.bmp'); walk2L := SDL_LOADBMP('associatedFiles\walk2L.bmp'); walk3L := SDL_LOADBMP('associatedFiles\walk3L.bmp'); walk4L := SDL_LOADBMP('associatedFiles\walk4L.bmp'); walk5L := SDL_LOADBMP('associatedFiles\walk5L.bmp'); stoodR := SDL_LOADBMP('associatedFiles\stoodR.bmp'); stoodL := SDL_LOADBMP('associatedFiles\stoodL.bmp'); jumpL := SDL_LOADBMP('associatedFiles\jumpL.bmp'); jumpR := SDL_LOADBMP('associatedFiles\jumpR.bmp'); cup := SDL_LOADBMP('associatedFiles\cup.bmp'); died := SDL_LOADBMP('associatedFiles\dead.bmp'); bombId := 1; leaveDiedScreen := False; leaveDoneLevelScreen := False; cowFacingDirection := 'stoodright'; angle_value := 0.0; escape := False; gravity := 0; onGround := False; walkingStage := 1; ele := SDL_LOADBMP('associatedFiles\elephant.bmp'); sea := SDL_LOADBMP('associatedFiles\sea.bmp'); blimp := SDL_LOADBMP('associatedFiles\blimp.bmp'); bomb := SDL_LOADBMP('associatedFiles\bomb.bmp'); hasDied := False; for a := 1 to 5 do begin for i := 1 to 14 do begin allElephants[a][i].relavtiveX := 0; allElephants[a][i].EleGravity := 0; allElephants[a][i].YPos := 0; end; end; for i := 1 to 5 do //go through each bomb begin allBombs[i].dropping := False; end; allElephants[1][1].relavtiveX := 1315; allElephants[1][2].relavtiveX := 2848; allElephants[1][3].relavtiveX := 3698; allElephants[1][4].relavtiveX := 3945; allElephants[1][5].relavtiveX := 4920; allElephants[1][6].relavtiveX := 7754; allElephants[1][7].relavtiveX := 10081; allElephants[2][1].relavtiveX := 850; allElephants[2][2].relavtiveX := 3900; allElephants[2][3].relavtiveX := 4162; allElephants[2][4].relavtiveX := 5725; allElephants[2][5].relavtiveX := 6000; allElephants[2][6].relavtiveX := 7718; allElephants[2][7].relavtiveX := 9392; allElephants[2][8].relavtiveX := 10011; allElephants[3][1].relavtiveX := 2567; allElephants[5][1].relavtiveX := 604; allElephants[5][2].relavtiveX := 1605; allElephants[5][3].relavtiveX := 2450; allElephants[5][4].relavtiveX := 2619; allElephants[5][5].relavtiveX := 3887; allElephants[5][6].relavtiveX := 6337; allElephants[5][7].relavtiveX := 8573; allElephants[5][8].relavtiveX := 11498; allElephants[5][9].relavtiveX := 12395; allElephants[5][10].relavtiveX := 14293; allElephants[5][11].relavtiveX := 15242; allElephants[5][12].relavtiveX := 15437; allElephants[5][13].relavtiveX := 15625; allElephants[5][14].relavtiveX := 15904; repeat if (levelNum >= 3) then //blimps only occur in levels 3,4,5 begin for i := 1 to 5 do //go through each bomb begin if (allBombs[i].dropping = True) then begin with allBombs[i] do begin gravity := gravity * 1.1; Ypos := Ypos + round(gravity); Xpos := backgroundX - droppedAtX + 250; bombRect.x := Xpos; bombRect.y := Ypos; bombRect.w := 22; bombRect.h := 25; key := SDL_MAPRGB(bomb^.format, 255, 255, 255); SDL_SetColorKey(bomb, SDL_SRCCOLORKEY, key); SDL_Blitsurface(bomb, nil, screen, @bombRect); if (Ypos > 500) then begin dropping := False; end; if (Xpos > 230) and (Xpos < 270) and (Ypos > SrcRect.y + (COWHEIGHT / 2) - 30) and (Ypos < SrcRect.y + (COWHEIGHT / 2) + 30) then hasDied := True; end; end; end; if (blimpRunning = False) and (random(blimpChance[levelNum]) = 1) then //add a new blimp at random. chance differs for each level. begin blimpRunning := True; blimpXpos := -266; end; if (blimpRunning = True) then begin blimpXpos := blimpXpos + 8; key := SDL_MAPRGB(blimp^.format, 255, 255, 255); SDL_SetColorKey(blimp, SDL_SRCCOLORKEY, key); if (blimpXpos > 500) then begin blimpRunning := False; end; if (random(10) = 1) then //add a new bomb at random times 20!! begin Inc(bombId); if (bombId = 6) then bombId := 1; with allBombs[bombId] do begin dropping := True; Xpos := 0; //this is overwritten later Ypos := 80; gravity := 10; droppedAtX := backgroundX - blimpXpos + 133; end; end; offset.x := blimpXpos; offset.y := 5; SDL_BlitSurface(blimp, nil, screen, @offset); if (blimpRect.x > 500) then blimpRunning := False; end; end; for i := 1 to 14 do begin if (allElephants[levelNum][i].relavtiveX <> 0) then begin with allElephants[levelNum][i] do begin positionOfEle := relavtiveX; ElephRect.x := backgroundX + positionOfEle + 250; EleGravity := EleGravity + 0.5; YPos := YPos + round(EleGravity); if (YPos + 90 > (300 + landValues[levelNum][-round( (-positionOfEle - 250) / 15)])) then EleGravity := -15; ElephRect.y := YPos; if (ElephRect.x < 700) and (ElephRect.x > -200) then begin key := SDL_MAPRGB(ele^.format, 255, 255, 255); SDL_SetColorKey(ele, SDL_SRCCOLORKEY, key); SDL_Blitsurface(ele, nil, screen, @ElephRect); end; if (ElephRect.x > 100) and (ElephRect.x < 250) and (SrcRect.y > ElephRect.y + 90 - 14) and (SrcRect.y < ElephRect.y + 90 + 14) then hasDied := True; //if the cow is around the feet of the elephant end; end; end; for i := 1 to 25 do begin positionOfSea := seaPositions[levelnum][i]; if (positionOfSea <> 0) then begin SeaRect.x := backgroundX + positionOfSea + 250; SeaRect.y := 455; key := SDL_MAPRGB(sea^.format, 255, 255, 255); SDL_SetColorKey(sea, SDL_SRCCOLORKEY, key); SDL_Blitsurface(sea, nil, screen, @SeaRect); end; end; //if the cow goes too far to the left where it shouldn't go if (backgroundX > -100) then backgroundX := -100; if (SrcRect.y > 455) and (landValues[levelNum][-round((backgroundX - 250) / 15)] = 220) then hasDied := True; //this makes the cow die if it lands in the poisonous water //it has to be below 455 px down and over the water (which //always has a landValue of 220) gravity := gravity + 1.5; //make the cow stand still on the ground and not sink newAngle_value := angle_value; if (newAngle_value > 180) then newAngle_value := 360 - angle_value; newCowHeight := COWHEIGHT + round(22 * sin((newAngle_value * 3.1412) / 180)); //this is to predict the distance from the top of the cow to //between its legs where it touches the ground, at any rotation. if (SrcRect.y + newCowHeight > landValues[levelNum][-round( (backgroundX - 250) / 15)] + 300) then begin if (SrcRect.y + newCowHeight < landValues[levelNum][-round( (backgroundX - 250) / 15)] + 300 + 50) then begin SrcRect.y := landValues[levelNum][-round((backgroundX - 250) / 15)] + 300 - newCowHeight + round(gravity); gravity := 0; onGround := True; //stop the cow from having a jumping image when reaching the ground picture := stoodR; //load right unless facing left if ((pos('left', cowFacingDirection) > 0)) then picture := stoodL; end else begin if ((pos('left', cowFacingDirection) > 0)) then backgroundX := backgroundX - 100; if ((pos('right', cowFacingDirection) > 0)) then backgroundX := backgroundX + 100; end; end; SrcRect.y := SrcRect.y + round(gravity); //code to make the cow look like it's walking Inc(walkingStage); if (walkingStage = 6) then walkingStage := 1; if (cowFacingDirection = 'stoodleft') then picture := stoodL; if (cowFacingDirection = 'stoodright') then picture := stoodR; if (cowFacingDirection = 'right') then begin case (walkingStage) of 1 : picture := walk1R; 2 : picture := walk2R; 3 : picture := walk3R; 4 : picture := walk4R; 5 : picture := walk5R; end; backgroundX := backgroundX - 13; end; if (cowFacingDirection = 'left') then begin case (walkingStage) of 1: picture := walk1L; 2: picture := walk2L; 3: picture := walk3L; 4: picture := walk4L; 5: picture := walk5L; end; backgroundX := backgroundX + 13; end; if (pos('right', cowFacingDirection) > 0) and (onGround = False) then picture := jumpR; if (pos('left', cowFacingDirection) > 0) and (onGround = False) then picture := jumpL; rotatedPicture := SDL_DisplayFormat(picture); key := SDL_MAPRGB(rotatedPicture^.format, 255, 255, 255); SDL_SetColorKey(rotatedPicture, SDL_SRCCOLORKEY, key); //ALL ABOUT ROTATING THE COW if (onGround = True) then begin gradY1 := landValues[levelNum][round( (-backgroundX + 250 - round(COWLENGTH / 2)) / 15)]; //gradY1 := round((gradY1 + landValues[levelNum][round((-backgroundX + 260 - round(COWLENGTH / 2)) / 15)])/2); gradY2 := landValues[levelNum][round( (-backgroundX + 250 + round(COWLENGTH / 2)) / 15)]; //gradY2 := round((gradY2 + landValues[levelNum][round((-backgroundX + 240 + round(COWLENGTH / 2)) / 15)])/2); //these two selection statements make sure that if the cow is perched over a ledge then the rotation doesn't make the cow face head downwards if (gradY2 = 220) then //at a stupid angle gradY2 := gradY1; if (gradY1 = 220) then gradY1 := gradY2; rotation := (52 * ((gradY2 - gradY1) / -COWLENGTH)); if (rotation < 0) then rotation := 360 + rotation; angle_value := rotation; zoom_value := 1; SrcRect.x := 250 - round(COWLENGTH / 2); if angle_value >= 359 then angle_value := 0.0; end; rotatedPicture := ROTOZOOMSURFACE(rotatedPicture, angle_value, zoom_value, 1); rotozoomSurfaceSize(COWLENGTH, COWHEIGHT, angle_value, zoom_value, rotated_width, rotated_height); levelArrLength := levelArrLengthsArr[levelNum]; //the array of the background is 1300 for every level, but the actual level lengths vary //hence why lots of the array is made of zeroes to fill up to 1300 //but this makes sure the drawBackground procedure doesn't bother with the empty spaces drawBackground(levelArrLength, levelNum); SDL_Blitsurface(rotatedPicture, nil, screen, @SrcRect); SDL_Flip(screen); SDL_Delay(50); //different colour background for each level case levelNum of 1: SDL_FillRect(screen, pSDLRect(0, 0, 500, 500), $63B8FFFF); 2: SDL_FillRect(screen, pSDLRect(0, 0, 500, 500), $2A8ADDFF); 3: SDL_FillRect(screen, pSDLRect(0, 0, 500, 500), $FFCCCCCC); 4: SDL_FillRect(screen, pSDLRect(0, 0, 500, 500), $FFFFFFA3); 5: SDL_FillRect(screen, pSDLRect(0, 0, 500, 500), $FFDDA0DD); end; //CHECKING KEY PRESSES keystates := (SDL_GetKeyState(nil)); SDL_PumpEvents(); if (keystates[SDLK_LEFT] <> 0) then begin cowFacingDirection := 'left'; end; if (keystates[SDLK_RIGHT] <> 0) then begin cowFacingDirection := 'right'; end; if (keystates[SDLK_RIGHT] = 0) and (keystates[SDLK_LEFT] = 0) then cowFacingDirection := 'stood' + cowFacingDirection; if (keystates[SDLK_UP] <> 0) then begin if (onGround = True) then begin gravity := -22; SrcRect.y := SrcRect.y - 10; onGround := False; end; end; if (keystates[SDLK_ESCAPE] <> 0) then begin escape := True; end; while SDL_PollEvent(@gameEvent) > 0 do begin if (gameEvent.type_ = SDL_QUITEV) then //checking if the X button on the window has been pressed begin escape := True; leaveProg := True; end; end; //ALL ABOUT CUP AND END OF LEVEL //adapting for the different lengths of the levels case levelNum of 1 : positionOfCup := 10812; 2 : positionOfCup := 10812; 3 : positionOfCup := 6758; 4 : positionOfCup := 10812; 5 : positionOfCup := 18770; end; CupRect.x := backgroundX + positionOfCup + 250; CupRect.y := landValues[levelNum][-round((-positionOfCup - 250) / 15)] + 90; key := SDL_MAPRGB(cup^.format, 255, 255, 255); SDL_SetColorKey(cup, SDL_SRCCOLORKEY, key); SDL_Blitsurface(cup, nil, screen, @CupRect); //if the cow reaches the cup if (backgroundX < -positionOfCup) then begin escape := True; if (newestLevelUnlocked = levelNum) and (levelNum <> 5) then Inc(newestLevelUnlocked); setNewestUnlockedLevel(newestLevelUnlocked); //this proc records this value in a file for later when the prog is reopened LevelDoneRect.x := 67; LevelDoneRect.y := 182; LevelDoneRect.w := 336; LevelDoneRect.h := 135; case levelNum of 1 : levelDone := SDL_LOADBMP('associatedFiles\complete1.bmp'); 2 : levelDone := SDL_LOADBMP('associatedFiles\complete2.bmp'); 3 : levelDone := SDL_LOADBMP('associatedFiles\complete3.bmp'); 4 : levelDone := SDL_LOADBMP('associatedFiles\complete4.bmp'); 5 : levelDone := SDL_LOADBMP('associatedFiles\complete5.bmp'); end; SDL_FillRect(screen, pSDLRect(0, 0, 500, 500), $B0E2FFFF); SDL_Blitsurface(levelDone, nil, screen, @LevelDoneRect); SDL_Flip(screen); repeat SDL_PollEvent(@myEvent); leaveDoneLevelScreen := (myEvent.type_ = SDL_MOUSEBUTTONDOWN) and (myEvent.Motion.x > 178) and (myEvent.Motion.x < 304) and (myEvent.Motion.y > 261) and (myEvent.Motion.y < 287); escape := True; if (myEvent.type_ = SDL_QUITEV) then //lets the program out to let it quit begin leaveProg := True; leaveDoneLevelScreen := True; end; SDL_PollEvent(@myEvent); until leaveDoneLevelScreen = True; end; //CHECKING IF DIED if (hasDied = True) then begin escape := True; DiedRect.x := 67; DiedRect.y := 182; DiedRect.w := 336; DiedRect.h := 135; SDL_FillRect(screen, pSDLRect(0, 0, 500, 500), $FFE4B5FF); SDL_Blitsurface(died, nil, screen, @DiedRect); SDL_Flip(screen); repeat SDL_PollEvent(@myEvent); leaveDiedScreen := (myEvent.type_ = SDL_MOUSEBUTTONDOWN) and (myEvent.Motion.x > 125) and (myEvent.Motion.x < 376) and (myEvent.Motion.y > 279) and (myEvent.Motion.y < 296); escape := True; if (myEvent.type_ = SDL_QUITEV) then //lets the program out to let it quit begin leaveProg := True; leaveDiedScreen := True; end; until leaveDiedScreen = True; end; until escape = True; end; begin randomize; SETUPWINDOW; IntCheat := 0; mainMenuRect.x := 0; mainMenuRect.y := 0; mainMenuRect.w := 500; mainMenuRect.h := 500; MainMenu := SDL_LOADBMP('associatedFiles\front1.bmp'); newestLevelUnlocked := checkNewestUnlockedLevel; leaveProg := False; MainMenu1 := SDL_LOADBMP('associatedFiles\front1.bmp'); MainMenu2 := SDL_LOADBMP('associatedFiles\front2.bmp'); MainMenu3 := SDL_LOADBMP('associatedFiles\front3.bmp'); MainMenu4 := SDL_LOADBMP('associatedFiles\front4.bmp'); MainMenu5 := SDL_LOADBMP('associatedFiles\front5.bmp'); repeat SDL_Blitsurface(MainMenu, nil, screen, @mainMenuRect); SDL_Flip(screen); SDL_Delay(100); while SDL_PollEvent(@MyEvent) > 0 do begin if MyEvent.type_ = SDL_KeyDown then begin case (myevent.key.keysym.sym) of SDLK_E : begin if (IntCheat = 0) then begin Inc(IntCheat); end else begin IntCheat := 0; end; end; SDLK_R : begin if (IntCheat = 1) then begin Inc(IntCheat); end else begin IntCheat := 0; end; end; SDLK_P : begin if (IntCheat = 2) then begin Inc(IntCheat); end else begin IntCheat := 0; end; end; else IntCheat := 0; end; if (IntCheat = 3) then begin newestLevelUnlocked := 5; IntCheat := 0; end; end; if MyEvent.type_ = SDL_MOUSEBUTTONDOWN then begin if (MyEvent.motion.x >= 145) and (MyEvent.motion.x <= 331) and (MyEvent.motion.y >= 478) and (MyEvent.motion.y <= 493) then begin setNewestUnlockedLevel(1); newestLevelUnlocked := 1; end; if (MyEvent.motion.x >= 65) and (MyEvent.motion.x <= 434) then begin if (newestLevelUnlocked >= 1) and (MyEvent.motion.y >= 183) and (MyEvent.motion.y <= 220) then begin LOADLEVEL(1); end else if (newestLevelUnlocked >= 2) and (MyEvent.motion.y >= 246) and (MyEvent.motion.y <= 281) then begin LOADLEVEL(2); end else if (newestLevelUnlocked >= 3) and (MyEvent.motion.y >= 308) and (MyEvent.motion.y <= 343) then begin LOADLEVEL(3); end else if (newestLevelUnlocked >= 4) and (MyEvent.motion.y >= 369) and (MyEvent.motion.y <= 405) then begin LOADLEVEL(4); end else if (newestLevelUnlocked >= 5) and (MyEvent.motion.y >= 432) and (MyEvent.motion.y <= 467) then begin LOADLEVEL(5); end; end; end; end; case newestLevelUnlocked of 1 : MainMenu := MainMenu1; 2 : MainMenu := MainMenu2; 3 : MainMenu := MainMenu3; 4 : MainMenu := MainMenu4; 5 : MainMenu := MainMenu5; end; if (MyEvent.type_ = SDL_QUITEV) then begin leaveProg := True; end; until leaveProg = True; SDL_FREESURFACE(picture); SDL_FREESURFACE(screen); SDL_QUIT; end.
Remarks
Could you use this program to help you to code your own platform game?
dita powered™.