Draw a rotating cube: Difference between revisions

=={{header|Objeck}}==

<lang objeck>

use Collection.Generic;

use Game.SDL2;

use Game.Framework;

class RotatingCube {

# game framework

@framework : GameFramework;

@initialized : Bool;

@nodes : Float[,];

@edges : Int[,];

New() {

@initialized := true;

@framework := GameFramework->New(GameConsts->SCREEN_WIDTH, GameConsts->SCREEN_HEIGHT, "Rotating Cube");

@nodes := [[-100.0, -100.0, -100.0], [-100.0, -100.0, 100.0], [-100.0, 100.0, -100.0],

[-100.0, 100.0, 100.0], [100.0, -100.0, -100.0], [100.0, -100.0, 100.0],

[100.0, 100.0, -100.0], [100.0, 100.0, 100.0]];

@edges := [[0, 1], [1, 3], [3, 2], [2, 0], [4, 5], [5, 7],

[7, 6], [6, 4], [0, 4], [1, 5], [2, 6], [3, 7]];

}

function : Main(args : String[]) ~ Nil {

RotatingCube->New()->Play();

}

method : Play() ~ Nil {

if(@initialized) {

# initialization

@framework->SetClearColor(Color->New(0, 0, 0));

RotateCube(Float->Pi(), 2.0->SquareRoot()->ArcTan());

quit := false;

e := @framework->GetEvent();

while(<>quit) {

@framework->FrameStart();

@framework->Clear();

# process input

while(e->Poll() <> 0) {

# joystick

if(e->GetType() = EventType->SDL_QUIT) {

quit := true;

};

};

#draw

DrawCube();

@framework->FrameEnd();

# render

@framework->Show();

Timer->Delay(200);

RotateCube (Float->Pi() / 180.0, 0.0);

};

}

else {

"--- Error Initializing Environment ---"->ErrorLine();

return;

};

leaving {

@framework->FreeShapes();

};

}

method : RotateCube(angleX : Float, angleY : Float) ~ Nil {

sinX := angleX->Sin();

cosX := angleX->Cos();

sinY := angleY->Sin();

cosY := angleY->Cos();

node_sizes := @nodes->Size();

size := node_sizes[0];

for(i := 0; i < size; i += 1;) {

x := @nodes[i, 0];

y := @nodes[i, 1];

z := @nodes[i, 2];

@nodes[i, 0] := x * cosX - z * sinX;

@nodes[i, 2] := z * cosX + x * sinX;

z := @nodes[i, 2];

@nodes[i, 1] := y * cosY - z * sinY;

@nodes[i, 2] := z * cosY + y * sinY;

};

}

method : DrawCube() ~ Nil {

edge_sizes := @edges->Size();

size := edge_sizes[0];

@framework->GetRenderer()->SetDrawColor(0, 220, 0, 0);

for(i := 0; i < size; i += 1;) {

x0y0 := @nodes[@edges[i, 0], 0];

x0y1 := @nodes[@edges[i, 0], 1];

x1y0 := @nodes[@edges[i, 1], 0];

x1y1 := @nodes[@edges[i, 1], 1];

@framework->GetRenderer()->DrawLine(x0y0 + GameConsts->DRAW_OFFSET, x0y1 + GameConsts->DRAW_OFFSET, x1y0 + GameConsts->DRAW_OFFSET, x1y1 + GameConsts->DRAW_OFFSET);

};

}

}

consts GameConsts {

SCREEN_WIDTH := 600,

SCREEN_HEIGHT := 600,

DRAW_OFFSET := 300

}</lang>