can anyone help with pushmatrix?

laptophead

I am modeling this robotic arm and it looks great.

I am also trying to display each angle next to each point of inflexion. In the case of the elbow, I am trying to move the text with the elbow position along with the inflexion point. That works, but I cant find a method to keep the writing horisontal. It rotates with the first segment angle...

here is my function

thanks

void ArmDepiction()

{ ///////////////////////////Base orientation

fill(201, 0, 211); // magenta //text("Y:", LS, spaceDown*3 ); text( (nf(degrees(BaseAngRad), 0, 1)), 630, 1050); //text( "0", 85, 0);

strokeWeight(10); stroke(238,242, 0); noFill ();

// Form: arc(x, y, width, height, start, stop, type); arc(550, 1000, 100, 100, (PI/2), (BaseAngRad+(PI/2)), PIE); //stroke(#71B28F); //arc(100, 1000, 175, 175, 0, 2*PI, 0);

//drawArrow(100,160,50,130);

///////////////////////Arm Depiction strokeWeight(40); stroke(255, 160); strokeCap(ROUND);

float x, y;

x = 550; y = 800;

pushMatrix(); strokeWeight(40); segment(x, y, PI+ShoAngRad); strokeWeight(30); segment1(segLength, 0, PI+ElbowAngRad); // 120 is the starting point segment3(segLength, 0, (2*PI)+ElbowAngRad-0.58); // 100 is the segment length popMatrix();

translate(x, y); strokeWeight(10); strokeJoin(ROUND); beginShape(); vertex(-40, 0);

vertex(-65, segLength); vertex(65, segLength);

vertex(40, 0); endShape(CLOSE);

DisplayElAngle(x, y);

}

void segment(float x, float y, float a) { translate(x, y); fill(201, 0, 211); // magenta //text("Y:", LS, spaceDown*3 ); text( (nf(degrees(ShoAngRad), 0, 1)), 30, 0); //text( "0", 85, 0); noFill ();

rotate(a); line(0, 0, segLength, 0); // 100 is the segment length

}

void DisplayElAngle(float x, float y) { translate(x, y); rotate(2PI); fill(201, 0, 211); // magenta //text("Y:", LS, spaceDown3 ); text( (nf(degrees(ElbowAngRad), 0, 1)), 20, -10); noFill (); //

} void segment1(float x, float y, float a) { translate(x, y); fill(201, 0, 211); // magenta //text("Y:", LS, spaceDown*3 ); text( (nf(degrees(ElbowAngRad), 0, 1)), 20, -10); noFill (); rotate(a); line(0, 0, segLength, 0); // 100 is the segment length // rotate(a);

}

void segment3(float x, float y, float a) { translate(x, y); rotate(a); line(0, 0, (segLength/5), 0); // 100 is the segment length

}

laptophead

Solved it myself. Had to make a function just for the letter display.

void segment1(float x, float y, float a) { translate(x, y); fill(201, 0, 211); // magenta //text("Y:", LS, spaceDown*3 ); // text( (nf(degrees(ElbowAngRad), 0, 1)), 20, -10); noFill (); rotate(a); line(0, 0, segLength, 0); // 100 is the segment length DisplayElAngle(x, y);

} void DisplayElAngle(float x, float y) { pushMatrix(); // translate(x, y); rotate (-ElbowAngRad); //Keeping the text horizontal- Compensate for elbow rotation rotate (-ShoAngRad); // Keeping the text Horiz - compensate for Shoulder rot fill(201, 0, 211); // magenta text( (nf(degrees(ElbowAngRad), 0, 1)), 20, -10); noFill (); popMatrix(); // Cancelling all rotations for future text use }

Chrisir

Well done.

Please note that there is a new forum

See also:

https://www.openprocessing.org

Chrisir

Make sure to format your code better in future

Also:

• pushMatrix and popMatrix form a block that essentially isolate the translations and rotations etc. inside it against what’s going on after it

• pushMatrix stores the current situation of the matrix (coordinate system) on an internal stack, popMatrix takes the last entry of the stack and restores it, so that the previous translations and rotations etc. are overwritten

Chrisir ;-)