`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 31.03.2020 13:05:10
// Design Name:
// Module Name: draw_rect_ctl
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////


module draw_rect_ctl(
    input wire clk,
    input wire mouse_left,
    input wire [11:0] mouse_xpos,
    input wire [11:0] mouse_ypos,
    output reg [11:0] xpos,
    output reg [11:0] ypos
    );

    localparam
        licznik = 1000000,
        final_y = 535;

    reg [19:0] counter = 0;
    reg [19:0] counter_nxt = 0;

    reg [11:0] time_counter = 0;
    reg [11:0] time_counter_nxt = 0;

    reg [11:0] initial_x, initial_y;
    reg [11:0] current_y, current_x;

    reg movement = 0;

    always @(posedge mouse_left)
    begin
        initial_y = mouse_ypos;
    end

    always @*
    begin
        counter_nxt = counter;

        if ((counter == licznik)  && (mouse_left == 1) && (movement == 1))
        begin
            counter_nxt = 0;
            time_counter_nxt = time_counter + 1;
        end

        if (mouse_left == 1)
        begin
            current_y = initial_y + time_counter;
        end

        if ((current_y >= final_y) && (mouse_left == 1))
        begin
            //position_counter_nxt = 12'b000000000000;
            movement = 0;
            current_y = final_y;
        end

        if (mouse_left == 1'b0)
        begin
            current_x = mouse_xpos;
            current_y = mouse_ypos;
            time_counter_nxt = 0;
            counter_nxt = 0;
            movement = 1;
        end
    end

    always @(posedge clk)
    begin
        counter <= counter_nxt + 1;
        time_counter <= time_counter_nxt;
        ypos <= current_y;
        xpos <= current_x;
    end

endmodule