raylib-drawing

raylib is a simple and easy-to-use game library, yet it lacks 2d drawing functions. raylib-drawing provides the functions that raylib lacks.

raylib-drawing is composed of two sub libraries:

• rdrawing.h 2d drawing library
• rturtle.h turtle graphics library

rdrawing.h

rdrawing.h provides many color definitions and basic 2d drawing functions:

The following program draw and fill a polygon interactively.

#include "../src/rdrawing.h"
#include <time.h>

int main() {
	InitWindow(800,600,"test");
	
	Image img=GenImageColor(800,600,WHITE);
	
	SetRandomSeed(time(NULL));
	SetTraceLogLevel(LOG_WARNING);
	int vx[200];
	int vy[200];
	int size=sizeof(vx)/sizeof(int);
	SetTargetFPS(120);
	int num=0;
	while (!WindowShouldClose()) {
		if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
			if (num<size) {
				vx[num]=GetMouseX();
				vy[num]=GetMouseY();
				if (num>0)
					ImageDrawLine(&img,vx[num-1],vy[num-1],vx[num],vy[num],BLACK);
				ImageDrawPointEx(&img,vx[num],vy[num],3,BLUE);
				num++;
			}
		}
		if (IsKeyPressed(KEY_ENTER)) {
			ImageFillPolygonEx(&img,vx,vy,num,LIGHTRED);
			ImageDrawPolygonEx(&img,vx,vy,num,3,BLACK);
			for (int i=0;i<num;i++) {
				ImageDrawPointEx(&img,vx[i],vy[i],5,BLUE);				
			}
		}
		if (IsKeyPressed(KEY_C)) {
			num = 0;
			ImageClearBackground(&img,WHITE);
		}
		Texture2D texture = LoadTextureFromImage(img);
		BeginDrawing();
		DrawTexture(texture,0,0,WHITE);
		
		EndDrawing();
		UnloadTexture(texture);
	}
	UnloadImage(img);
	return 0;
}

Function	Usage
ImageDrawPointEx	Draw a point to the image
ImageDrawArcEx	Draw an ellipse arc to the image, using the provided line width and color
ImageDrawLineEx	Draw a line to the image, using the provided line width and color
ImageDrawPolylineEx	Draw a polyline to the image, using the provided line width and color
ImageDrawRectangleEx	Draw a rectangle's outline to the image, using the provided line width and color
ImageDrawRoundRectEx	Draw a rounded rectangle's outline to the image, using the provided line width and color
ImageDrawCircleEx	Draw a circle's outline to the image, using the provided line width and color
ImageDrawEllipseEx	Draw an ellipse's outline to the image, using the provided line width and color
ImageDrawPolygonEx	Draw a polygon's outline to the image, using the provided line width and color
ImageFillCircleEx	Fill a circle (no outline), using the provided fill color
ImageFillEllipseEx	Fill an ellipse (no outline), using the provided fill color
ImageFillTriangleEx	Fill a triangle (no outline), using the provided fill color
ImageFillRectangleEx	Fill a rectangle (no outline), using the provided fill color
ImageFillRoundRectEx	Fill a rounded rectangle (no outline), using the provided fill color
ImageFillPolygonEx	Fill a polygon (no outline), using the provided fill color
ImageFillSectorEx	Fill a ellipse sector (no outline), using the provided fill color
ImageFloodFill	Do a flood fill (stop at the pixels has the border color)
ImageDrawCubicBezierEx	Draw a cubic bezier curve to the image, using the provided line width and color
ImageSetJoinStyle	Set line join style
ImageGetJoinStyle	Get line join style

rturtle.h

rturtle.h is an animated turtle graphics library.

#include <rturtle.h>

int main() {
	int n;
	initWorld(800,600);

    setSpeed(500);

	n=50;
	for (int i=0;i<n;i++) {
		for (int j=0;j<4;j++) {
			fd(200);
			lt(90);
		}
		lt(360.0/n);
	}
	waitClick();

	closeWorld();
	return 0;
}

It also provided some interactive functions while drawing:

• Press F2 toggle show/hide of auxilary grids.
• Press F3 toggle show/hide of the turtle.
• Press F5 Capture the screen.

Function	Usage
initWorld	Init the turtle world window
closeWorld	Destory the turtle world window
forword / fd	Move the turtle forward
backward / bk	Move the turtle backward
leftTurn / lt	Turn the turtle's heading counter-clockwise (left)
rightTurn / rt	Turn the turtle's heading clockwise (right)
gotoXY	let the turtle move to (x,y)
turnTo	turn the turtle's heading to angle
faceXY	turn the turtle heading to (x,y)
arc	Move the turtle to draw an arc
clear	Clear the canvas but don't move the turtle
clearScreen / cs	Clear the canvas and set the turtle back to the origin
home	Move the turtle back to the origin, and heading to up
waitClick	Pause the program, until window closed or mouse left-clicked
penDown / pd	set the pen down
penUp / pu	set the pen up (turtle's movement won't have tracks)
setPenDown	set the pen's donw/up status
isPenDown	query if the pen is down
hide / show	hide/show the turtle
setVisible	set the turtle's visibility
isVisible	query if the turtle is visible
setPenSize	set the pen's size
getPenSize	get the pen's size
setPenColor	set the pen's color
getPenColor	get the pen's color
setSpeed	set the turtle's move speed
getSpeed	get the turtle's move speed
setRewind	set if the turtle should rewind when hit borders
isRewind	query if the turtle should rewind
setImmediate	set if the turtle's moves should be animated
isImmediate	query if the turtle's moves should be animated
setXY	set the turtle's position to (x,y)
setHeading	set the turtle's heading
getX	get the turtle's position's x-coordination
getY	get the turtle's position's y-coordination
getAngle / getHeading	get the turtle's heading angle
getState	get the turtle's state
setState	set the turtle's state
setOrigin	set the origin to (x,y)
setCaption	set the window's caption
setBackgroundImage	set the window's background image
setBackgroundImageFile	Load image from the file, and set the window's background image to it
setBackgroundColor	set the canvas's background color
getBackgroundColor	get the canvas's background color
createGrids	create auxilary grids
removeGrids	remove auxilary grids
beginFill / endFill	fill the polygon generated by turtle's move
fill	flood fill (stop at pixels that has different color from the current pixel)
fillToBorder	flood fill (stop at pixels that has the border color)
drawPoint	draw a point
drawLine	draw a line
drawEllipse	draw an ellipse's outline
fillEllipse	fill an ellipse