Drawing Basic Shapes

Before we start writing our Game, let us see some useful functions provided by olc pixel game engine that help us in drawing shape.

Note: I won't be providing full working code, just add these codes to the OnUserUpdate function and that would work.

Drawing a Line

To draw a line use the DrawLine Method

DrawLine(5,5, 30, 30);

DrawLine has a signature of:

DrawLine(int32_t x1, int32_t y1, int32_t x2, int32_t y2, Pixel p = olc::WHITE, uint32_t pattern = 0xFFFFFFFF)

It simply draws a line from (x1,y1) to (x2,y2)

Drawing a Circle

To draw a circle use the DrawCircle Method

DrawCircle(50, 50, 5);

DrawCircle has a signature of

DrawCircle(int32_t x, int32_t y, int32_t radius, Pixel p = olc::WHITE, uint8_t mask = 0xFF)

It simply draws a cirle centered at (x, y) with a radius.

Drawing a Filled Circle

As we might have guessed just call the FillCircle Method

FillCircle(50, 50, 5, olc::RED);

We passed an additional parameter, the color of the pixel to fill with.

Drawing a Rectangle

We use DrawRect method.

DrawRect(5,5, 30, 40);

It draws a rectangle at (5,5) with a width of 30 and height of 40.

Drawing a Triangle

We use DrawTriangle method.

DrawTriangle(5,5,20,5, 12,10);

DrawTriangle has following signature:

DrawTriangle(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t x3, int32_t y3, Pixel p = olc::WHITE)

It simply draws a triangle between three points (x1, y1), (x2, y2) and (x3, y3);