Hey Guys,
So I've been working on creating a drawing tool and I have it all laid out. However I am having trouble creating a mousePressed button to change the drawing tool. For example

I have 4 buttons that are suppose to do different things

button1- regular line tool
button 2- change colors depending where the mouse is on the screen
button 3- mousepressed ellipse tool
button 4- mousepressed square tool.

Here is my code for you =]


//******CANVAS******//
int xMin = 15; // position-left
int xMax = 450; // position of the canvas from-right
int yMin = 50; // position-top
int yMax = 420; // position-bottom

//******First Square Button******//

float x=20;
float y=10;
float w=30;
float h=30;
boolean button1=false;

//******Second Square Button******//

float sx2=120;
float sy2=10;
float sw2=30;
float sh2=30;

//******Ellipse Button******//

float ellix=240;
float elliy=25;
float elliw=30;
float ellih=30;


//******Third Button******//

float sx3=340;
float sy3=10;
float sw3=30;
float sh3=30;


//******Clear Button******//

float sx4=470;
float sy4=470;
float sw4=20;
float sh4=20;
boolean button=false;


void setup() {
  //*canvas dimensions*//
  size(500, 500);
  background(149,87,5);
  noStroke();
  rect(xMin, yMin, width - 2*xMin, height - 2*yMin);
}

//******VOID DRAW PLACEMENT******//
void draw(){
  //drawWorkSpace();
  drawImageSquare();
  drawImageSquaretwo();
  drawImageEllipse();
  drawImageSquareThree();
  drawImageSquareClear();
  }


//******CANVAS******//

//void drawWorkSpace(){
 
  // stroke(0);
  //strokeWeight(2);
  //smooth();
    //if ((mouseX > xMin) && (mouseX < xMax)) {
    //if ((mouseY > yMin) && (mouseY < yMax)) {

      //if (mousePressed) {
        //line(pmouseX, pmouseY, mouseX, mouseY);
      //}

        //}
          //}
//}


//****** FIRST SQUARE Button ******//


void drawImageSquare(){
     rect(x,y,w,h);
     fill(255);
          rect(x,y,w,h);
     //fill(255);
     if (mouseX > x && mouseX < x+w && mouseY > y && mouseY < y+h && mousePressed) {
  button1 = true;
  } else {
    button1 = false;
 }

if (button1=mousePressed) {
   stroke (255);
  fill (67,255,244);
  ellipseMode(CENTER);
  ellipse (mouseX,mouseY,16,16);
  }


   
    //******Second Button******//
} 
   
void drawImageSquaretwo(){
     rect(sx2,sy2,sw2,sh2);
     fill(255);
     //mousePressed goes here
}

//****** Ellipse Button ******//
   
void drawImageEllipse(){
     ellipse(ellix,elliy,elliw,ellih);
     fill(255);
     //mousePressed goes here
}

//****** Third Button ******//

void drawImageSquareThree(){
     rect(sx3,sy3,sw3,sh3);
     fill(255);
     //mousePressed goes here
}
  
//****** Clear Button******//

void drawImageSquareClear(){
     rect(sx4,sy4,sw4,sh4);
     fill(255);
     if (mouseX > sx4 && mouseX < sx4+sw4 && mouseY > sy4 && mouseY < sy4+sh4 && mousePressed) {
    button = true;
  } else {
    button = false;
  }

 if (button) {
   fill(random(255),random(255),random(255));
    rect(xMin, yMin, width - 2*xMin, height - 2*yMin);
    stroke(0);
  } else {
    stroke(0);
  }

 
 fill(255);
 rect(sx4,sy4,sw4,sh4);
}




Basically I've been playing around with the //*******FIRST SQUARE BUTTON******// just to combine the mousepress and buttonPressed. I also need to put a constrain in to stay within the parameters of the canvas. I figured once I figure out how to connect the first button, than I can play with the other three. If someone can help me that will be great. I have so much code that it's confusing me. I know what I want to say but I don't know how.

Thanks in advance, if someone can stir me in the right direction for my first button.